Download "Практика программирования на Python 3, лекция №7"

"videoThumbnail Практика программирования на Python 3, лекция №7

Практика программирования на Python 3, лекция №9

Практика программирования на Python 3, лекция №9

Channel: Тимофей Хирьянов

Практика программирования на Python 3, лекция №11

Практика программирования на Python 3, лекция №11

Channel: Тимофей Хирьянов

Параллельное программирование на Python

Параллельное программирование на Python

Channel: Тимофей Хирьянов

Практика программирования на Python 3, лекция №5

Практика программирования на Python 3, лекция №5

Channel: Тимофей Хирьянов

Практика программирования на Python 3, лекция №13

Практика программирования на Python 3, лекция №13

Channel: Тимофей Хирьянов

мфти

фопф

информатика

00:00:02

program that we are following will succeed,

00:00:06

we have to work a lot, I

00:00:08

have to work quite a lot so

00:00:13

that the content that appears

00:00:15

right now, yes, in the process of

00:00:18

every week, the teachers

00:00:20

think something, I’m there, think through the lectures, that’s

00:00:23

not it what we have prepared for someone’s textbook is a

00:00:25

miracle we’re reading, let’s say this is what they

00:00:28

call creating a good training

00:00:29

course for them so that other physical and technical schools

00:00:32

will want other tracks too, so

00:00:37

maybe one of you will grow up in

00:00:40

two years, become a mentor at the

00:00:44

computer science department, an assistant teacher

00:00:46

in four years how to finish

00:00:48

your bachelor's degree, maybe you can

00:00:50

even become a teacher, it will be

00:00:52

very cool because personnel is very

00:00:55

needed, unfortunately, the leak is very large,

00:00:57

many worthy teachers,

00:01:00

well, it’s trivial that they emigrate for their own reasons,

00:01:02

and again, I can’t blame

00:01:05

anyone, I understand everyone personally, thank you, see

00:01:07

you off but it turned out that way,

00:01:11

I’m staying, well, I’m telling you who you

00:01:13

got here, you got it, let’s

00:01:16

try to

00:01:20

spend as much time as possible on the master class today, it’s

00:01:22

always my dream, and anyway,

00:01:24

I’m talking, we should

00:01:28

start talking about

00:01:30

classes now and objects, classes and objects in

00:01:35

python,

00:01:48

I specifically don’t say directly such

00:01:51

big words they want anyway,

00:01:53

they’ll probably be said

00:01:55

object-oriented

00:01:56

programming

00:01:57

next time I’ll talk about it again,

00:02:00

I’ll talk about

00:02:02

it, but now let’s get to the

00:02:04

point simpler, just one piece

00:02:06

about the bite, here’s a specific thing, let’s

00:02:11

start with what, when you use any

00:02:18

object, an integer

00:02:21

string object, then you use exactly the

00:02:23

object in other

00:02:27

programming languages there is bare data, well, that

00:02:30

is, here y because it’s like a number, but

00:02:33

in fact, even for a stupid number everything there

00:02:35

is also a set of algorithms associated with

00:02:37

its addition, subtraction, multiplication, about

00:02:40

some algorithms that allow

00:02:43

this piece of memory to be interpreted and

00:02:46

somehow work with it, yes, that is,

00:02:50

in fact, there is still no

00:02:53

pure data, so let's start with what it is

00:02:56

in general the object is

00:02:59

essentially what is its idea, the object is

00:03:05

what it is: on the data,

00:03:07

or even better, write equal to

00:03:10

data

00:03:12

+ code, I mean code in the sense of

00:03:16

program code, the object is

00:03:21

precisely the combination of data together with

00:03:24

program code in a situation with numbers with

00:03:27

some- then there are also simple objects,

00:03:30

this connection between the data with code, it

00:03:32

will often be built into the

00:03:33

programming language and drug situation si si

00:03:36

plus plus there you can work with the data

00:03:41

using other code, take this and I

00:03:45

will tell you in the next semester,

00:03:47

so let’s not rush us but the

00:03:51

object allows you to beautifully connect and

00:03:55

visually see this unit when

00:03:58

your data is wrapped in a certain

00:04:00

number of

00:04:01

functions functions in this case

00:04:05

will no longer be called functions in through but

00:04:08

they continue to be in fact a pure

00:04:10

full-fledged function but there will be

00:04:12

some difference in let’s write the

00:04:13

actual

00:04:15

class now what is a class, let’s also

00:04:18

write here what a class is, a class is a

00:04:23

type of object in Python, everything is designed as a

00:04:31

class and numbers from a string, but this is not the case in

00:04:33

all languages, so in

00:04:37

other languages there are ordinary types, and

00:04:41

there are classes, there are types, there are classes,

00:04:44

therefore in Python sounds strange class

00:04:47

it could have been such a law class 1

00:04:49

type I still want you to understand that

00:04:52

for other languages there is also a cool type

00:04:54

of objects, that is, our objects can

00:04:57

be 1 class refusal I don’t know there but

00:05:00

Maruska Koza notka Koza Zorka they

00:05:04

belong to the Cossack class you this thing is

00:05:06

relatively abstract at the same time

00:05:09

there may be some data that is

00:05:12

attached to no specific

00:05:14

object and which are called

00:05:17

class properties of a class or

00:05:20

class attributes,

00:05:23

well, let's start with the fact that in order to

00:05:26

create an object you need to first

00:05:28

create a class of the object because the language he

00:05:32

must understand that I am an object and what

00:05:34

class it is that the

00:05:36

creation of a type of objects, the creation of classes,

00:05:39

so I must write no, I like

00:05:41

to tell procos means let’s be a

00:05:44

year class year: that means that then the

00:05:52

contents of the actual classes are written with a stop,

00:05:54

here again the main idea is

00:05:56

that the data and codes

00:05:58

belong to us, how to say, it is designed

00:06:02

very beautifully into some kind of integral unit

00:06:04

on well, I can accordingly write here,

00:06:07

for example there and

00:06:08

and there and by the way, here’s the age of the

00:06:12

abstract goats

00:06:14

starting for no age before but I

00:06:17

mean, let’s write 0 or

00:06:21

something the strange goat will have at least

00:06:23

some age 0 and there’s something else

00:06:25

she should have a Klitschko name or there’s a nickname,

00:06:28

not like a Christian name, well,

00:06:32

click Klitschko no nickname, accordingly, I did

00:06:40

n’t write it for always before, but in English,

00:06:42

in my opinion, everything I did

00:06:44

n’t know what it would be called, although okay, I’ll write it, that

00:06:47

is, then I’ll try,

00:06:48

okay, what did I want to say on and the name is

00:06:51

abstract goats, but also, honestly,

00:06:57

only you may accidentally have a

00:06:59

goat dawn, which you didn’t name, all the

00:07:00

default codes

00:07:02

are not really there an empty string is probably the

00:07:05

best solution so far the best solution by

00:07:08

the way all plus plus here you would

00:07:10

n’t have any questions at all

00:07:14

I’m absolutely sure because there we would

00:07:16

just write a type and everything in Python is not possible in

00:07:19

Python, values appear only when a

00:07:21

specific value is assigned so

00:07:24

it’s simply not possible it means what’s next, but also

00:07:26

name age, what else,

00:07:28

well, weight, let’s stop here, so I

00:07:30

made several properties of the

00:07:32

Wade goat, what a story, again, listen, I’ll

00:07:37

put 0. 0 is actually

00:07:41

not necessary to write 0 at all. 0 can be just

00:07:44

zero. will already turn out to be real 0 or . You

00:07:46

can also write 0 like this, but I

00:07:49

’ll write 0.0, let it be shorter like this,

00:07:53

and sometimes insert some code here,

00:07:56

that is, shove some function inside here

00:07:58

for working with goats,

00:08:00

respectively, I’ll write df that when

00:08:04

I do it, I’ll

00:08:06

print it, for example or show, let's let him

00:08:08

show himself,

00:08:09

goat, show yourself, then look in

00:08:13

Python, the function that is embedded

00:08:18

inside the class, I loaded it into the class,

00:08:21

this is a class with its

00:08:22

own function called such functions

00:08:24

methods methods, respectively, it

00:08:28

must have an argument

00:08:31

called sat sat, it always goes the first is

00:08:38

this parameter, it

00:08:40

must be a link to a specific

00:08:47

object for which the show method is called, that

00:08:51

is, from inside this method, I actually

00:08:54

wrote

00:08:56

abstract ones here and it doesn’t actually

00:09:00

have these abstract weights of age

00:09:04

and

00:09:05

and a nickname and not a specific

00:09:07

personified specific goat object,

00:09:10

so if I want anything, first a cell

00:09:13

phone is required, yes, and secondly, it is a

00:09:18

link to a specific object for which this method

00:09:25

will be called, an object before for which

00:09:30

this method is called, for which

00:09:38

this method is called,

00:09:43

and, accordingly, when I want here

00:09:47

to print something then I will have to

00:09:50

print

00:09:52

cells .

00:09:55

name in my name,

00:10:01

but if I just want name, then he won’t

00:10:03

say, sorry, there are no such variables, well,

00:10:06

either locally, they are equal to, if I

00:10:09

write here, for example, there is equal to yes, then

00:10:12

this will mean that I am locally

00:10:14

creating a new variable inside the function, it has

00:10:16

nothing to do with the whole this is like an

00:10:19

object or an entire class does not have a

00:10:21

function ended variable is gone

00:10:25

last time I spoke briefly about

00:10:27

local variables backgammon is not enough

00:10:31

in general local changes exist

00:10:33

only as long as the function is called

00:10:36

no well if we return a link to this this object in

00:10:39

the evening there yes, then the link

00:10:43

will be saved, let

00:10:46

this object live there longer under a different name, but in

00:10:50

principle, by default, all names

00:10:54

are destroyed when the function call ends, it’s

00:10:57

clear that since the names cease

00:11:00

to exist, the garbage collector will eat all

00:11:02

the objects that no one else

00:11:04

references, so local variables are

00:11:06

traditionally all are destroyed at

00:11:08

the end of the function h, here I

00:11:10

get such a feature, look, yes, that

00:11:13

means I have a

00:11:16

village names of each such I pull its weight

00:11:20

now I won’t print

00:11:22

I have these

00:11:28

properties that exist outside of

00:11:34

this show function and at the same time they

00:11:37

tied to specific cases and I

00:11:39

will have the opportunity to create several

00:11:42

goats, that is, then I will immediately start

00:11:44

using it and now let’s create

00:11:46

Kazuo

00:11:47

and Kazakh gold,

00:11:54

respectively, in order to create an

00:11:56

instance of this class, well, naturally, an

00:12:00

instance of this class will

00:12:02

be an object, in principle, even a

00:12:04

synonym is used we can say that an

00:12:07

object is an instance of a class, if

00:12:15

you come across a definition, don’t be

00:12:17

surprised by an instance of a class, but what is a

00:12:21

class to chaos, this is a type of objects

00:12:24

because, I say again, they are quite

00:12:26

tied to each other, an

00:12:27

instance of a class is specific to the essence

00:12:31

that appears to us specifically for so

00:12:34

in order to create an instance of a class I have to

00:12:37

call the name of the class as if this

00:12:40

function

00:12:42

you see, that is, I call it as if I’m

00:12:47

talking about the great abstract goat from the

00:12:49

world of ideas to embody and it gives me its

00:12:54

embodiment which I save some

00:12:56

already concrete object of

00:12:57

luggage and I I can ask him in

00:13:01

fact I can ask him

00:13:03

print but now I’m doing this so true type

00:13:07

a

00:13:08

and he won’t say I seem like this is a goat

00:13:10

there class year will be like class int class

00:13:12

str and this is a new type you have that

00:13:17

you can to do with a goat, firstly with an

00:13:20

object you can change its attributes, I

00:13:24

can take it and say a .

00:13:27

nm is equal to note a.

00:13:35

Hey ji is equal to 2y, it’s like two years of cauldrons,

00:13:41

so I took it and milked it. By the way, you can

00:13:44

do it like this, yes ah.

00:13:47

go to equal a . hey ji plus 10 and plus 2

00:13:55

although years under + 2 are not added to, after

00:13:58

all, people and animals are

00:14:01

one year each, so but I will write

00:14:04

in abbreviation plus equals 1,

00:14:06

but let’s move on, that is,

00:14:11

in short, I have the ability to access the

00:14:13

attributes of their changes I I can create

00:14:16

another goat and if I equal the year

00:14:25

accordingly and put

00:14:28

some other name there there is a note of dawn

00:14:33

then b.

00:14:35

age is equal to 1 I can now work with

00:14:43

punches like these with such

00:14:46

valuable aggregates, there’s a whole bunch of different

00:14:49

properties, maybe there can be a

00:14:50

lot of them, for example, there’s a game object called

00:14:52

Arc, and he also has Shelby and

00:14:55

some hills and so on further so

00:14:58

force and much more position

00:15:01

exposure y it in short it can

00:15:04

have a lot of properties and for a second

00:15:06

and inside these functions which are

00:15:10

called methods let’s

00:15:14

consolidate these terms now to achieve a

00:15:16

class function called class methods

00:15:19

and this is a set of attributes that’s what

00:15:25

’s called attributes,

00:15:27

or properties, before class attributes and

00:15:35

attributes and methods are accessible through a dot,

00:15:39

that is, if I want to access an

00:15:41

object attribute, I say b there. on his

00:15:46

naturally a. name is different

00:15:48

to another object, but both of

00:15:52

them have the opportunity to call the show method,

00:15:56

and I will no longer need to

00:15:58

list and say a .

00:16:01

show and continue to list in parentheses what

00:16:06

exactly he should

00:16:08

not have, I just close the bracket and do

00:16:12

n’t even indicate the letter here in brackets, but

00:16:17

well, in the sense of sitting down,

00:16:18

that is, the parameters of the sal of he

00:16:23

rushed inside by default, that is, the

00:16:26

call format itself is like this: we have

00:16:29

a parameter and it is, as it were, sent inside the

00:16:32

method automatically as a pair, the first

00:16:34

parameter of this method is automatically

00:16:36

so when you call it you will see 0

00:16:39

parameters and at the moment when you

00:16:42

describe the method there will be a parameter

00:16:47

methods may have additional

00:16:49

parameters that are required then I

00:16:52

will put it here and write more there are

00:16:55

some names of parameters then I will

00:16:57

have to list these parameters here

00:16:59

time to ask the question

00:17:11

to the next poppy the following under the

00:17:13

topic which will be on the board right

00:17:17

now for a second well, in

00:17:18

short the point is that once again yes that

00:17:21

I work with objects in a very convenient way

00:17:25

and all the responsibility

00:17:30

associated with these aggregate

00:17:34

processes, like

00:17:36

showing a goat and just milking the goat

00:17:41

or increasing its age, celebrating the

00:17:43

goat’s birthday,

00:17:44

this is all responsibility for everything that

00:17:46

happens to the goat, for everything that happens

00:17:47

with these aggregate logically integral

00:17:52

data, that is, they are for us in essence of the

00:17:55

problem being solved, for us they are an

00:18:00

understandable entity, either humanly

00:18:04

or we came up with this entity, but in

00:18:05

any case, a certain set is given that

00:18:07

characterizes one, how to say

00:18:10

one piece of the problem, one piece of our

00:18:13

task, the object is very often a

00:18:15

convenient entity, highlight, highlight and

00:18:18

encapsulate responsibility for

00:18:22

the processes occurring, I will say inside the

00:18:24

goat class,

00:18:26

it encapsulates them as a scanf bag like that,

00:18:28

yes we all do, and if suddenly we want to

00:18:33

improve the goat, we must

00:18:36

create or change the methods of the goat

00:18:39

and not some other functions that are

00:18:42

located somewhere else in the project, that

00:18:44

is if it concerns a goat, then

00:18:46

we open the basic class,

00:18:47

this is essentially what is not called until the

00:18:49

encapsulation of responsibility, in short,

00:18:52

okay, let's move on, let's start, I explained the

00:18:55

next question,

00:19:00

what should we do, what will happen if I call a

00:19:04

printout when we have an object object and

00:19:07

nothing has yet been assigned an id or name has

00:19:09

not yet been assigned, which means when I’m telling

00:19:14

you this now, this is telling the idea, that’s

00:19:19

what it is, look, we return to the fact that here’s the

00:19:23

problem teaser oval at the beginning,

00:19:26

because there really is no abstract

00:19:29

age, but what if

00:19:31

such a situation really arises, I took it

00:19:34

and didn’t assign anything at all to the sub class and

00:19:39

I’m trying to display it there, it’s a nightmare, what a

00:19:43

horror, what’s the problem, but the fact is that I

00:19:47

’ll see how to say the parameters of abstract

00:19:50

goats, and this is actually not good for

00:19:54

good, I should not have the right to

00:19:57

create a goat

00:20:00

without age and without a nickname, but there was 1 without a

00:20:04

nickname, you can but let's

00:20:05

try to think differently, what if this is a

00:20:08

student whom I calculate into the

00:20:10

MVT student database and so I create a

00:20:13

class foo so that I have it there in my

00:20:15

program before class student and my student

00:20:18

and he should be protected from such a

00:20:23

creation that I I can say about the

00:20:25

same student, yes, and I already have it all in the

00:20:28

database, abstract without parameters,

00:20:30

this shouldn’t be good for

00:20:32

students and we enroll only when they

00:20:34

have a surname, first name, middle name, age and

00:20:37

documents, okay, at least surname, first name,

00:20:39

middle name, age, let’s just conditionally by

00:20:41

analogy, so that they don’t write off the board now,

00:20:44

you understand, yes, I have to do something so

00:20:47

that the interface for creating an object

00:20:53

requires the mandatory entry of its name,

00:20:57

but as soon as I close this bracket,

00:21:01

syntactically insert nothing here

00:21:03

anywhere, so I need to actually, as it

00:21:07

were, build in getting the parameters for

00:21:10

creating this particular one an instance of

00:21:12

the class here

00:21:13

now will be described there yes right here right here here

00:21:17

here when creating I

00:21:20

’ll write a little here and also

00:21:23

you don’t that is here and I

00:21:27

have to write some parameters here yes

00:21:29

well let’s say I’ll just

00:21:31

call it Masya and Vasya to him 17 years old,

00:21:35

welcome to fob, so I have a

00:21:42

new one, how to say in applications to a

00:21:44

programming language, I want it to be able to

00:21:46

receive design parameters, but

00:21:53

someone should do this, initializing attributes, a

00:21:58

special method that will be

00:22:00

called a constructor, although in Python

00:22:03

it is called and not, but in the literature everything

00:22:06

Equally, in essence, this is a

00:22:08

constructor understands about the constructing

00:22:12

method of constructors, in short, now I

00:22:20

will not create a single

00:22:25

attribute like this, and I will create all the attributes inside a

00:22:31

function, in this function there will be a

00:22:34

specific name 2 underscores

00:22:37

since I require quite specific

00:22:39

things to receive the parameters in

00:22:42

brackets when creating an instance, then I

00:22:45

need, accordingly, well, so that

00:22:47

the name of the package, yes, well, as if it were

00:22:50

specific, because it will not need to be

00:22:52

called, that is, this is this, this is the

00:22:56

transfer of parameters to the constructor

00:22:59

for this, the parameters of the constructor,

00:23:12

the parameters of the constructor, respectively,

00:23:16

I need inside the class,

00:23:19

that is, pay attention to this

00:23:21

use of objects of objects of the

00:23:25

class that I am creating here, and this is the

00:23:27

creation of a class for its use,

00:23:30

so I actually tie these things

00:23:31

now as it turns out from the point of view of the

00:23:35

class, which means there are no 2 underscores and very much

00:23:42

in parentheses the first parameter I

00:23:45

will write is selfie absolutely correctly, don’t

00:23:48

ever miss it, don’t forget about it, and

00:23:51

continue to do so, but I’ll write their

00:23:56

name vertically, and

00:24:01

the bracket closes: vertically, well, that’s

00:24:07

also good, we see that we have three

00:24:10

parameters, one of which is the strength of what

00:24:12

the task of the init method is what its task is,

00:24:16

its task is to use these

00:24:20

parameters to carry out with the object sat

00:24:24

which is constructing the father and until the

00:24:28

init method

00:24:31

of initializing the object is completed, the object, as it were, has not

00:24:34

been created yet, it is clear if suddenly

00:24:37

an accident occurs during the

00:24:39

initialization process, then what is this called in the

00:24:42

middle of the process of enrolling students, the

00:24:45

database turned off the electricity,

00:24:48

well, there is such a thing as transactional and the

00:24:50

model is given now this does not

00:24:53

concern us at all, but the point is that if we

00:24:55

half enter you gazelle Vasya species

00:25:01

without age, then problems will arise

00:25:03

in the database itself,

00:25:06

therefore database they do, well, at the

00:25:09

moment we are not talking about a database, but in any

00:25:11

case about an information system,

00:25:13

essentially yes within the framework of the program, but

00:25:16

nevertheless, an object cannot be considered

00:25:20

created if I was in the process

00:25:23

at the moment when I was

00:25:25

creating here new name attribute

00:25:29

sat down flame I'm creating here there was no

00:25:33

name attribute until I assign it to it

00:25:36

and so I assign name to it,

00:25:41

assign it outside it and thereby I

00:25:44

pass a link to some

00:25:47

external object inside I assume that it is a

00:25:50

string although I don’t checked this,

00:25:53

maybe by the way, at this moment it would be necessary to

00:25:54

check what if there isn’t a line in the valley,

00:25:56

now we’ll forget it, but nevertheless, the point is,

00:25:59

I forward a link to the line name

00:26:01

that they will give me from there, and the

00:26:05

name name appears in the object space in the

00:26:10

self object appears on it then I

00:26:11

would like to know exactly what they are constructing here, so that’s why

00:26:13

I was talking about transactions, if

00:26:16

I suddenly have

00:26:17

here, and by the way, the constructor

00:26:19

can actually

00:26:21

calculate something that is customary for you, but suddenly in the

00:26:24

process it divides something by zero and by

00:26:27

arithmetic problem Azeroth division

00:26:30

based and the python flew away, bending our

00:26:34

thoughts, flew down with an error, the program

00:26:36

falls out, well, in fact, errors

00:26:40

inside the program can be processed, but

00:26:43

in fact the most important thing for now, remember

00:26:45

that the object until the constructor

00:26:47

ends until we come out here is

00:26:50

not even here, yes, from this

00:26:53

moment on, the object is not considered created,

00:26:58

okay, I also wanted to say about the villages,

00:27:01

Linda sat down and equally

00:27:04

hey ji, and thus I threw away these

00:27:07

parameters, quite by the way, I’m saying again,

00:27:09

maybe there is some additional

00:27:10

functionality here, well, for example, I don’t know

00:27:13

there is some kind of seal and a prince, then

00:27:15

we are there, conditionally, I’m just there now with a

00:27:20

plus sign name , in quotes, the plus sign night of

00:27:25

the substance is credited,

00:27:27

by the way, in Python there is no normal

00:27:31

way to delete objects, well, some kind of

00:27:34

grandfather of a destructor, all plus plus it is, and

00:27:38

in Python there is a method that should be

00:27:42

called when reconstructing an object, but

00:27:44

let’s say in Python the mechanism itself for this

00:27:47

reliable closing of some resources is

00:27:49

organized

00:27:50

otherwise we don’t care now at all, it’s

00:27:53

not part of our problem, but the point is that

00:27:56

again, yes, now I’m creating

00:28:00

attributes inside the constructor, these are the

00:28:04

attributes

00:28:05

firstly, they become mandatory, that

00:28:08

is, when trying to create like this, I

00:28:11

took my sister, I’ll say yes, when trying to

00:28:13

create a student like this,

00:28:15

if I have already described a

00:28:17

constructor like this and no, then when trying to create

00:28:21

just a student like this, at the

00:28:24

execution stage at this moment I

00:28:26

will have an interpreter going on strike and shouting,

00:28:29

how about these are the constructor parameters,

00:28:31

let me create it and you have a very clear case, this is

00:28:36

what at this moment, right here, when

00:28:39

I made a goat and started typing everything, I

00:28:43

may have a hidden, not obvious error, the

00:28:48

programmers and I I hope you, too,

00:28:51

programmers really don’t like hidden

00:28:54

errors, but here it’s very clear, we

00:28:59

stated that for our class, these are

00:29:01

the parameters, here it is, and it requires these

00:29:04

parameters when creating, and the compiler-

00:29:06

interpreter in this case

00:29:08

helps us understand these requirements,

00:29:11

so clearly drinking away the prescribed ones

00:29:14

parameters are better than implicit dojen python

00:29:17

clearly better than not I don't answer a good question

00:29:24

good c plus plus do

00:29:28

in some programming languages

00:29:32

you can write several constructors in

00:29:35

python several constructors cannot be written in

00:29:39

python constructors no one like

00:29:43

including in python you cannot create several

00:29:46

functions of the same name in python there is no

00:29:49

overload by the name of the function,

00:29:54

respectively, and there is no possibility

00:29:57

to create several and not so let’s say the

00:30:01

type is possible, but

00:30:04

only the last one will actually work, which means there are also such

00:30:08

rules of politeness, yes, I can take it at any

00:30:11

time and stick it to a

00:30:14

student, I didn’t know there, but I have a student

00:30:16

and I took it and I glue a new attribute to him

00:30:20

directly on the new attribute and I also say

00:30:24

you will have a tail I don’t

00:30:29

know tail physics I don’t know in short

00:30:36

the meaning is that Abilio has decrees up to the ear per

00:30:39

year I’ll take it glued and r equals 5

00:30:44

fifth leg case

00:30:46

so the language allows this in python, a

00:30:52

specific object may differ from

00:30:55

representatives of its class by the presence of

00:30:58

additional attributes,

00:31:00

but the rules of politeness require this, don’t

00:31:05

do this, don’t do that, that is, the language, he

00:31:08

once again said, is quite soft in this

00:31:10

sense, new attributes can be created not

00:31:13

only in the constructor, but the rules of

00:31:15

politeness say that that new

00:31:17

attributes can only be created here, that is,

00:31:21

this is this place where it is created

00:31:24

created again, I will write that this is

00:31:27

actually a constructor, this is a constructor and

00:31:32

all new properties,

00:31:35

new attributes should appear exactly

00:31:38

there,

00:31:39

and only here new

00:31:48

attributes should be created, the fact is that it is a

00:31:54

constructor this is the method that will be

00:31:57

exactly called for any instance of the

00:31:59

class and this will ensure their uniformity

00:32:03

when working with a whole array of lists of

00:32:07

many of these same entities, the student

00:32:10

there we can assume and even

00:32:14

be sure of the existence of the

00:32:17

corresponding attributes if we

00:32:20

glue these attributes like- then along the way we

00:32:23

may find ourselves in a situation of having

00:32:25

5 legs decrees, well, in principle, the leg attribute leg

00:32:27

is clear, is it

00:32:38

necessary, is it necessary?

00:32:45

There are things

00:32:47

that both in society and in

00:32:51

programming are done on trust and

00:32:54

there is a position such as conservatism, the

00:32:58

boxes are conservative but in the sense of morality

00:33:01

I believe that morality does not

00:33:03

pass over centuries and millennia,

00:33:05

but in the sense of how to say

00:33:11

politically, I am very liberal, I believe

00:33:13

that freedom is much more important than lack of freedom,

00:33:15

and only in freedom can something

00:33:17

develop, and in this sense,

00:33:21

there is such a thing in programming balance until

00:33:23

you allow too much until they start writing

00:33:26

all sorts of garbage

00:33:28

too much you forbid food very

00:33:31

strict framework of requirements

00:33:33

here in the same C plus plus in this

00:33:35

sense it is a compiled language and everything is

00:33:37

through strict typing and you are not scared, for

00:33:40

example, by what you can take and put in Python

00:33:42

there, instead of name, not a string,

00:33:44

but put 18 here for me, Vasya, and not

00:33:48

be 17 as me Vasya as HIV, a

00:33:51

stupid person

00:33:53

can use it like that, but only then

00:33:55

it breaks at some point when there are

00:33:57

thousands plus equals 1 and it turns out Vasya plus

00:33:58

equals de well, that is, the error will come out in

00:34:02

any case, the thing is that there

00:34:06

is still some balance in both a and

00:34:08

compiled languages, they create the illusion

00:34:12

that the program does not need to

00:34:15

be tested, that the program

00:34:19

and since it was compiled means it

00:34:21

is good and this is not a program in C

00:34:25

plus plus it is necessary to test in exactly the same

00:34:27

way as a program in Python,

00:34:29

they have the same problems with

00:34:32

digital security, they can be

00:34:35

compromised like programs in

00:34:37

Python, and even

00:34:38

there the situation is even worse, sometimes the situation is

00:34:40

therefore it compiles, it protects, but there is

00:34:43

nothing, this is what we would ban

00:34:50

again you have a piece of charm

00:34:52

there is one for charm put yourself in the

00:34:55

patches of the community vishnu who didn’t put

00:34:58

it you don’t have to do it

00:35:00

but nevertheless I will say about him there is

00:35:03

this little man in the lower right corner

00:35:05

who is looking at you

00:35:06

you can ask and he will tell you everything

00:35:09

he comments on what is called, yes, that is,

00:35:10

about every line, but also underline it with

00:35:12

red, yellow, and blue, that’s

00:35:15

accordingly, and he finds fault, if you want,

00:35:18

you can turn him half a turn, he

00:35:20

will start to find fault only with critical

00:35:22

things, if you want, you can

00:35:24

turn him completely away from this and he will be silent,

00:35:26

shut up, you understand you can

00:35:28

actually really rape a

00:35:31

programming language, but it’s better to follow the

00:35:34

rules of

00:35:35

pep 8, the rules of readability, the rules of

00:35:38

documentation, the rules of good manners,

00:35:42

and here’s one of the rules of good manners about

00:35:45

which, by charm in particular, he will

00:35:46

remind you when he sees something like this, he

00:35:48

will emphasize this to you and say are you

00:35:50

sure,

00:35:51

but like everything plus plus there you can also

00:35:54

do static crap and fish deventer

00:35:56

pride fire yes yes yes yes and in fact

00:35:59

you number is clear and such this is something else I'll

00:36:03

give a lot of things you can do and as

00:36:07

the compensator said he too you

00:36:09

should shut up and keep quiet makes

00:36:11

madness which you write to him

00:36:13

okay, in short about the constructors I said

00:36:17

about I didn’t say about the difference in attributes

00:36:21

now a little more drawing that I can’t

00:36:23

draw on the screen anymore the

00:36:26

thing is that look here I’ll

00:36:29

draw this thing with goats there is an

00:36:32

abstract class goat

00:36:35

it’s a class it’s said year as such

00:36:39

let me write the year at the top and

00:36:42

accordingly it has a class

00:36:46

class the thing is

00:36:48

that a class in Python

00:36:52

are objects of a class in Python

00:36:57

are objects they belong to a

00:37:01

class class but they are classes which

00:37:06

means they are objects of a class class it’s

00:37:08

clear if I ask type year and

00:37:12

so I’ll ask who exactly is

00:37:14

this year tell me you know

00:37:17

actually the year is a class it’s understandable therefore

00:37:20

but this is basically a normal situation

00:37:22

Sean it’s clear but it also means that this is

00:37:25

what the class itself has as such for the

00:37:29

goat class it after all, it’s not quite a

00:37:32

concrete class anymore,

00:37:34

but it has its own namespace, which is why

00:37:37

I have the opportunity

00:37:40

to create methods that are universal for all

00:37:43

goats,

00:37:44

it’s clear for the dawn for a note,

00:37:47

respectively, and when I wrote these

00:37:49

now

00:37:50

and name and Wade there, then I have there

00:37:53

is both age and name which with

00:38:01

being names refer to objects

00:38:04

that are named accordingly

00:38:06

in space are objects needed 0

00:38:09

what is there an empty line name2 empty line

00:38:13

star and stir listen and I Wade now won’t

00:38:18

draw on it there will be nothing

00:38:20

or there here 0.0 I’ll write

00:38:23

when I create an instance of a goat, a specific

00:38:27

object kazaa, what I’m actually doing is I’m

00:38:32

already making an object that has the class year

00:38:37

goat and so due to the fact that the object

00:38:41

and every object in Python remembers what

00:38:44

type it is, it remembers that it’s actually of the

00:38:48

class Kazan I will refer to this object

00:38:52

somewhere from my main

00:38:54

program. I have a main

00:38:56

namespace in the project, we are

00:39:00

main, respectively, and my

00:39:02

object a refers to the object created by

00:39:05

goats, which by the way is still nameless at

00:39:07

the moment,

00:39:08

but nevertheless the name a refers to this

00:39:10

object is in the namespace of the object

00:39:15

that I called the letter and now there is not a

00:39:18

single name there is not a single name there,

00:39:23

but if I ask, and in Python you can

00:39:28

ask

00:39:29

an object and which ones do you have exactly

00:39:32

and imagine that at this

00:39:34

moment I ask at this moment I’ll

00:39:37

take it and ask him der and I’ll

00:39:41

insert an arrow here der

00:39:44

and this is one of the possibilities of

00:39:47

introspection, that is, looking at

00:39:50

yourself as a mirror, the Python interpreter himself

00:39:52

in the process of execution, to

00:39:54

say something about

00:39:55

the self, this is an opportunity to find out and what kind of

00:39:58

attributes and methods does the object have in general

00:40:01

and which I give there will be quite a lot of

00:40:05

built-in ones that you will be surprised and

00:40:07

say wait I didn’t create them

00:40:09

I have 1 2 3 4 on and there’s a lot of everything there will be

00:40:13

some more built-in methods

00:40:15

but none the less Let’s say, a lesser man saw

00:40:19

that the object itself doesn’t have a single

00:40:24

name in the namespace; at the same time,

00:40:27

if I did something like this, for example, yes, I would

00:40:30

create it and immediately use it. I can do a show, how can it be like

00:40:34

this, it shows me these numbers,

00:40:37

so the trick is that in Python

00:40:41

there is a process and when a specific object is created,

00:40:44

I don’t have any assignment

00:40:49

here in this namespace, there is no

00:40:51

assignment, which means there is no creation of new

00:40:54

objects from for attributes, which means

00:40:58

it turns out when I’m writing let’s

00:41:01

do it for this let it be b mad

00:41:04

rendered this yes to for which I have

00:41:06

n’t created anything yet, no attributes there and

00:41:08

so I say b. Prince

00:41:11

let's

00:41:13

print I just want

00:41:17

to print b regardless of the show.

00:41:19

age I am referring to an attribute that is

00:41:25

not inside the object in the namespace of the

00:41:28

object there is no name ash

00:41:30

but not finding a

00:41:34

name among the instance attributes, Python

00:41:40

will go looking for speech in the

00:41:43

class namespace among the class attributes, the

00:41:47

logic is clear, yes, that is, instance

00:41:51

attributes are specific for specific goats,

00:41:54

and there are abstract ones which, how to say

00:41:58

the services of the class itself as such, so

00:42:02

according to the logic of things, why did the

00:42:05

students correct this problem with decrees, no,

00:42:07

in fact, there is no abstract

00:42:11

age, no abstract name, no

00:42:13

abstract weight, in

00:42:14

general, they would actually

00:42:17

be here and not Each instance must have them,

00:42:19

but not abstractly

00:42:22

abstractly,

00:42:23

there must be

00:42:25

construction methods, the show method, it is

00:42:28

really universal for each

00:42:30

case, this is done in absolutely the same way,

00:42:31

yes, yes, there can be things

00:42:35

that are at the level of all goats globally, they are the

00:42:39

same constant number of legs

00:42:46

mix lex

00:42:48

us a and there will be four

00:42:52

constants, rather, a place there in class

00:42:57

attributes again, this is an important concept, you

00:43:00

need to be able to name and understand them, this is where the

00:43:03

so-called

00:43:05

instance attributes live, instance

00:43:11

attributes and methods,

00:43:13

well, now we are mainly talking about attributes, in

00:43:17

fact, from instances of methods in a

00:43:19

good way the instance should not be

00:43:21

maintained differently from all the other goats in

00:43:23

this when the show says it’s strange,

00:43:26

although there are opportunities to once again replace a method

00:43:29

on a specific instance, like the

00:43:31

ability to add a new case attribute,

00:43:33

yes, it is theoretically possible, or even by the way,

00:43:37

to replace a constant on a specific object of

00:43:39

this class too in principle, you can

00:43:42

specifically find it and your max alex

00:43:44

sayz will be 5 okay, but this is again like that

00:43:46

and some were worn with the tongue in a

00:43:48

good way, by the way, the constants themselves as

00:43:50

such are not even in the den in a good way,

00:43:52

but there are some methods of naming them

00:43:55

that help you realize that this is a

00:43:57

constant and and not

00:43:58

shouldn’t be touched okay and this is to get

00:44:02

if this is an instance of this these are class

00:44:05

class attributes let’s finish with this

00:44:11

and what I would like to tell you

00:44:16

and show you, imagine what I’m

00:44:19

going to listen to and I don’t even know to be

00:44:22

honest How can I start? Maybe it

00:44:24

makes sense to start completely from scratch,

00:44:26

maybe I can name the project, I can immediately

00:44:28

open there a draft of the project that

00:44:30

you will have this week, not the

00:44:32

next week, now you often add more

00:44:34

balls, but when you see this, you will

00:44:36

immediately want even balls it’s possible

00:44:38

to write differently,

00:44:40

okay, let’s start sequentially,

00:44:44

balls conditionally, yes, I’ll try to make

00:44:46

balls from scratch in the garden, I didn’t have any, there

00:44:51

were some files, let’s

00:44:54

copy it, so it’s me, but I

00:45:04

can do this, Nick Methyl’s old collections, so

00:45:27

okay, that means everything had to go I

00:45:30

think so about the hulk us lecture is number 7

00:45:37

lecture 07

00:45:38

and I wanted to copy some example from 6

00:45:42

no from 5 probably where

00:45:46

Hello World was it was actually our

00:45:49

library so that we don’t have to

00:45:52

remember how it was done there because the

00:45:56

seventh means and I’ll now drag this Hello

00:46:01

World to you what it’s called what you

00:46:07

call it I’ll have maybe a us more

00:46:11

balls. Pai and so I apologize

00:46:20

automatically vim I enter, I would like to

00:46:23

open in this

00:46:36

so and so, so we had a front

00:46:41

kinder import asterisk and a

00:46:45

couple of handlers, which means I will need an

00:46:48

exit character, I don’t need it and I won’t link it to

00:46:53

this, I’m sorry not to the button, I

00:46:58

can actually remove the button altogether, which means

00:47:00

I’ll add a little modularity here, that

00:47:03

is, I would actually like to bring these things

00:47:04

related to initialization

00:47:06

to more to

00:47:10

say, on the other hand, I need the

00:47:13

root variable to be a global variable of

00:47:16

the module, I’ll now do the following I will send things

00:47:20

related to initialization

00:47:24

to the main function in which I

00:47:32

will make the root variable a global variable

00:47:36

modules and this thing I am sending here

00:47:40

means accordingly what I am doing and

00:47:42

flame remember this I am doing so that

00:47:46

my bolt can be there if there are any

00:47:49

inclusions behind it to spoil it’s equal to main a

00:47:55

little bit it’s a little bit modular but it’s

00:47:57

still a little bit call the

00:48:00

main function so the program ends

00:48:02

you know I’m removing the unnecessary things I’m

00:48:05

removing the unnecessary comments binding

00:48:07

handlers to the event this is already

00:48:10

clear I’ll remove the same thing remove the corner label is

00:48:12

pretty cool label our label with I wo

00:48:14

n’t create any instead of a label I will

00:48:17

create canvas and by the way not front ken

00:48:20

torin por asterisk

00:48:21

I will still import do kent rstk

00:48:25

with a short name but still to make it

00:48:28

clear that this is in a separate library

00:48:31

where these things are located respectively I will

00:48:34

not create canvas, but... . canvas

00:48:37

canvas I will create it on the main

00:48:40

window so I am registering darude this is

00:48:43

not Holloway Balakin you by the way,

00:48:45

it would be good for the canvas to be global too

00:48:47

because then I will go to the same

00:48:50

canvas I have one in this module and it’s good for

00:48:53

me to remember this

00:48:55

canvas object so that then we continue to work with it,

00:48:57

so I also made it global;

00:48:59

in general, global variables

00:49:02

are evil; global variables are actually

00:49:07

evil, or let’s say there should be

00:49:11

as few of them as possible, and this violates the principle. It’s

00:49:14

clearly nervous; when you transfer

00:49:18

information through global

00:49:20

variables, it reminds as if

00:49:22

you called your friend or a plumber

00:49:27

to help you perform some

00:49:28

activity

00:49:29

and the parameters of his work are written on the

00:49:31

fence and you died global changes

00:49:36

look there, you get the feeling that well, of

00:49:38

course, of course I can, but every

00:49:40

time I can go without assigning new

00:49:43

parameter values there yes, I can

00:49:46

say one place further only

00:49:48

call but this is not a good

00:49:53

simplification of the problem because the next

00:49:57

programmer will simply not know about the

00:49:59

existence of global variables or

00:50:01

that as a result of the function

00:50:02

the plumber writes about his problems on

00:50:05

the fence and also a pipe has burst

00:50:08

about this, you won’t get liquor as a result parameter,

00:50:11

not as an exception that

00:50:14

will crash and crash the program there, or

00:50:16

process it, so to speak, somewhere in the

00:50:18

global variable r, as in the C language,

00:50:21

global changes appearing r at

00:50:23

some error number magically, and you

00:50:26

even you don’t know, continue the program

00:50:28

continues to work, a typical situation,

00:50:30

but the pipe is broken, okay, what I want to

00:50:34

say is to protect now, I briefly

00:50:36

described what I’m doing and quickly

00:50:37

put it to the point of creating an instance of the

00:50:39

actual ball that will be on

00:50:41

the canvas, these balls will also be there now,

00:50:43

I may even have different ones will be shorter

00:50:45

meaning that's what I'm creating a canvas a ghost I

00:50:48

need to the canvas I will need to bind

00:50:52

events and also the hall actually I need

00:50:55

for what is it called packing

00:50:59

pack accordingly already indicated in

00:51:04

which widget so I

00:51:06

didn't have any parameters there were absolutely no

00:51:08

parameters the only widget is the canvas so well and let

00:51:12

me have a handler for the event for now, yes,

00:51:14

it’s a mouse knu, after all, let’s

00:51:16

call him not a handler, meaningfully, any

00:51:18

function must correspond to the

00:51:20

essence of the

00:51:23

essence of the nickname in this sense, it can

00:51:26

sometimes be the best, but people have a nickname and

00:51:30

sometimes it doesn’t say much about the bouncer conditionally yes, but

00:51:33

if I immediately understand what he does

00:51:35

or is a nerd, it’s also clear, well, in short, the point is

00:51:39

that when you create a function,

00:51:42

call it abstract and this is a

00:51:44

handler, this means saying almost

00:51:46

nothing, so I’ll still write mouse click

00:51:51

angler, but for good reason it’s not even just a

00:51:55

mouse click handler, yes, and this is a canvas,

00:51:59

that is, I emphasize here that in general

00:52:01

we process up to a canvas crippled handler,

00:52:05

accordingly, on the floor, I

00:52:07

will put a gate on the canvas on it and

00:52:09

call it, let’s check that

00:52:11

this thing is working for me globally, and now a

00:52:14

canvas has appeared on a gray one there you can

00:52:17

do something on this canvas, let’s

00:52:19

now check that you can do something on the canvas

00:52:21

there, it can do something that you didn’t have,

00:52:25

and what by the way you will need to do

00:52:27

this week is processing events by

00:52:29

time, maybe someone has already done it

00:52:32

well, let’s start and now

00:52:34

I’m doing straight water in the global and no, I’ll

00:52:38

register the appearance of a new ball, which

00:52:42

I do before leaving for the main loop, but

00:52:45

after creating the canvas

00:52:47

I’ll create this is how I create a ball a ball

00:52:50

is actually three things yes it’s

00:52:53

x y and radius yes, here's x y radius 3 3

00:52:57

parameters if the first option I can

00:53:01

make it global variables of the module,

00:53:03

let's do it, but how to go down then

00:53:06

from the handlers you will need access to them, which

00:53:08

really means you will have to and took it as

00:53:10

global variables,

00:53:12

let's make this not an object on the

00:53:14

global one, I'll do one more instructions so that you can then

00:53:17

joyfully delete it quickly global x y z

00:53:20

and then I’ll write right away I almost don’t like it, I feel

00:53:23

bad somehow on not an object on yes there is

00:53:31

such an option for writing comments

00:53:34

like that doo-doo-doo well really go there

00:53:38

imitating to do something and then there is this

00:53:40

to rewrite, that is, it’s more likely no longer

00:53:42

breathing badly somehow yes here you actually need to

00:53:45

do it as it’s called there I

00:53:54

should have said the words I

00:53:56

last time he said whether factory

00:53:59

refactoring do object and

00:54:02

refactoring 0 and object-oriented

00:54:07

refactoring means pronounced

00:54:10

last time, refactoring meant

00:54:12

rewriting the program code while

00:54:15

maintaining the functionality; there was

00:54:18

no addition of anything new;

00:54:21

there was no new functionality, but the program

00:54:25

became more readable; everything was

00:54:27

better organized, that is, it did

00:54:30

n’t have a front-end and the back-end

00:54:36

became better and more well

00:54:39

thought out. light and on the floor as a

00:54:42

harm to the balance of the port there was a program here

00:54:44

actually or in fact very often

00:54:46

the program cannot develop further due to the fact

00:54:49

that it is written poorly inside

00:54:51

and if it is written inside it is great

00:54:54

good okay listen our time is

00:54:57

running out we are moving forward

00:54:59

what are we doing next that means I’m

00:55:02

now creating this new object here, yes, I’m

00:55:07

now X, I’m equal to random, but I need to

00:55:12

naturally there from the brand, I’m now

00:55:17

renting in that, I’ll drag it there, I’m doing

00:55:21

rent and cheese here, a random number in the

00:55:24

range,

00:55:25

but honestly, I don’t remember in my root.

00:55:30

thank you Ruth, in my opinion height is what they

00:55:38

should be called in theory no no no

00:55:44

no window

00:55:45

hello hello in the info you see yes screen

00:55:49

height to screen you really like

00:55:57

adding well in short screen haida there there

00:55:59

is a parameter gift and in accordingly

00:56:02

we will have this for igreka parameter and

00:56:05

also rent in the 1 1 will listen and I’ll

00:56:08

probably still

00:56:10

create this separately, I have a long line, it

00:56:11

turns out to be long, why do we create them separated

00:56:13

by commas, in fact, it

00:56:16

can be useful there screen

00:56:18

you then, and therefore a certain radius, please

00:56:27

sorry rent in you should be starting

00:56:29

from starting from let's say one to

00:56:31

starting from one to so and the radius is

00:56:36

something rent and

00:56:40

in the range from 10 to

00:56:42

there the charms want 20 and the creator of the

00:56:48

actual cda object means and by the way

00:56:50

the link to the bolt object should to be also

00:56:54

global they have the ball itself,

00:56:56

go on the canvas, by the way, the bolt is not the

00:56:59

image of the ball itself, it’s like an

00:57:02

avatar, its visual representation, yes, it’s a

00:57:05

physics model, so I’ll add here

00:57:08

that the

00:57:09

ball actually go to the canvas has always been,

00:57:13

maybe full, was completely Balkan

00:57:16

you go, yes, in short, that’s all I’m

00:57:19

writing, it’s actually not very good,

00:57:20

so let’s be honest, I

00:57:22

kept you thinking things, I want ball

00:57:25

id gray,

00:57:26

what’s up and I should say canvas canvas

00:57:30

.

00:57:31

kreed now it won’t tell you creed fall

00:57:37

means in what position in position x minus

00:57:41

r

00:57:42

to y minus r x + r a y + r well, there also

00:57:51

seems to be a color that needs to be indicated, I don’t

00:57:53

remember how to do it there, but the color indicates

00:57:56

the feltton will be indicated yes phil grind

00:58:01

green balls will be launched then, ok, let's

00:58:03

check that it is, in principle, created and

00:58:06

unsupported type where a + b range because

00:58:12

where again and I needed brackets ha

00:58:22

ha of course this is a method that needs to be

00:58:24

called to find out in my opinion like this,

00:58:27

come on, why is there some kind of silence

00:58:36

he didn’t write where yes, but I can

00:58:38

actually ask here what it is equal to and

00:58:40

what y is for, apparently he still doesn’t have the same

00:58:43

dimensions there, it returns them, it’s a pity, well, maybe

00:58:47

the canvas knows its width by height, or one in the

00:58:50

same place can somehow be his with this diameter

00:58:52

to how to do it and

00:59:02

Jimmy 3 to

00:59:04

it you can specify specific dimensions

00:59:07

accordingly there is conditionally there 1000 x in

00:59:11

the date not 1000 smaller 800 x 600

00:59:15

and what is the problem

00:59:21

like shop numbers were numbers from 800

00:59:28

plus in quotes x above in python

00:59:33

you work before there is some, maybe

00:59:35

you can read it for a long time to study if there is some

00:59:37

painfully correct way, but

00:59:39

this is this one and the thing for which you

00:59:41

should not rack your brains, it seems to me that if it does

00:59:45

not affect the performance of

00:59:46

the program because this thing that is

00:59:48

produced once

00:59:49

needs to be optimized those parts of the program

00:59:52

that are executed millions billions of

00:59:54

times, there needs to be strict optimization, maybe

00:59:56

even a change of programming language from Python

00:59:58

to this, you will

01:00:01

call a function from Python that is written in this,

01:00:02

it will serve the bottleneck, it doesn’t

01:00:04

matter, let it be like this and

01:00:07

everything is clear, yes please yes and again

01:00:11

this is in principle yes it will be necessary the 6th will be

01:00:12

constants yes there is some kind of global you yes

01:00:16

you I will write do it these are the constants

01:00:22

glasses I will write them here here you are above the

01:00:24

hate is equal to 600

01:00:28

like the time of this summer these are ours

01:00:30

objects we may not be able to reach, at least I’ll

01:00:34

launch it so it’s flying, yes, I

01:00:36

’ll still tell you more about objects of

01:00:38

the class, then at home the cat has become wider, but

01:00:41

something is a parameter I have, something else is

01:00:43

not being created right now, but on the account, and here I want it

01:00:45

to I had you here and I’m jumping

01:00:52

by the way left and right control left control

01:00:54

right according to the words and don’t use the mouse

01:00:56

again y from the same spirit and in

01:01:01

fact in a good way so that the ball does not fly out of

01:01:04

bounds you need to create p at the beginning and

01:01:06

do from r now it minus this

01:01:10

same r and the same thing with

01:01:13

take when starting from r to the height minus

01:01:15

equals so that it

01:01:17

more or less fits in my hand, let’s have a ball, what is it,

01:01:21

why is it so bad because my

01:01:25

canvas is not packed, this one the gene of you

01:01:29

for my whole family has not relaxed what’s his name

01:01:32

incra you know yes the binding how’s it nsv

01:01:39

and to the north south west east

01:01:44

let’s do it again

01:01:54

singer and there it’s like that there it’s like that you

01:01:58

can listen to him I honestly don’t remember how to

01:02:00

do it but n .V.

01:02:05

and how can I stretch it there is another

01:02:07

way there is to stretch it fit like x y

01:02:17

phil or feed me map fit what’s the matter

01:02:24

again bed in car and w no in capital

01:02:28

letters phil good reality and phil now

01:02:34

I’m doing x y small or large bau

01:02:42

bau will fit in

01:02:43

written points all Ingush now he

01:02:49

finally what’s the problem he now

01:02:55

started there is no error, well then because.

01:03:07

buff should be thank you,

01:03:14

forgive me, please

01:03:20

do it anyway, it doesn’t stretch it, to be

01:03:23

honest, it doesn’t stretch it normally,

01:03:28

in short, don’t care, let’s shorten our

01:03:31

how to say the narrative, I’ll reduce

01:03:34

the size to about the size of the canvas, and for

01:03:37

us this generation will

01:03:38

always happen here, and in fact, it will take hours

01:03:40

to process the click I don’t have any yet, I want

01:03:42

to say that I have now, first of all, and

01:03:48

all the parameters are global, sorry, I didn’t

01:03:51

get around to doing this, it’s object-

01:03:53

oriented at the pores, we’re running out

01:03:54

of canvas to converge already,

01:03:56

yes, but if I even do it now, well, in the

01:04:00

same read clip or somewhere else, I’ll launch it now

01:04:03

I will still write such a tag in

01:04:06

which I will make a root. author in which

01:04:12

I will call

01:04:14

events I correspond to the same

01:04:17

type yes with there 5 50 microseconds conditionally

01:04:22

day I remember the truth the parameters in which on the

01:04:23

contrary accordingly what can I

01:04:27

do I now set once for 20

01:04:31

times per second in fact yes something will

01:04:33

happen print samsung here and

01:04:38

I have this type, the main thing now is to

01:04:40

start, after everything I’m

01:04:43

here once and I’ll run one layout,

01:04:45

I’ll make a disabled syntax where I forgot:

01:04:48

install thank you interpreter and now I have

01:04:53

samsung printed 20 times per second, why do I need this I need it, so

01:04:56

now I can take it and

01:04:59

modify it if I get to x and y

01:05:05

and p, well, maybe I don’t even need it now,

01:05:09

then I can now take it and

01:05:13

move the ball,

01:05:14

but while it’s here it’s

01:05:18

bad, what will I do

01:05:20

x plus equals 1 y plus equals 1 and this is how

01:05:25

I do it until I apologize, the variables

01:05:27

change until and the canvas doesn’t move

01:05:30

well, what else should I say ska

01:05:33

canvas, what’s the move, yes it means the move, what was it

01:05:40

called ball aide means and

01:05:45

you need to tell him the steps actually he

01:05:47

needs to do a dext there y there something like this

01:05:50

done I don’t show off now, I’ll

01:05:53

just do it like that and my ball

01:05:55

flew I really like what I just

01:05:59

wrote I assumed that I would

01:06:01

write faster and that we’ve reduced the match a little more

01:06:03

we’ll have time to push this thing to class

01:06:05

because now the movement itself is

01:06:09

at least killed, look at it, swear at

01:06:12

everything that is happening with me and the

01:06:15

initialization of my this very

01:06:18

initialization of my new ball and its

01:06:22

movement and processing of the click event on

01:06:26

this ball, this is all now

01:06:29

scattered in different places of the program who is

01:06:31

responsible responsibility for the fact that the

01:06:33

ball is clicked, is not attached, is destroyed by him

01:06:35

or does he still have a house,

01:06:37

maybe he should have health and the ball

01:06:38

gradually changes its color

01:06:40

to red and only then it will burst, and

01:06:42

where is the actual effect of bursting, but for

01:06:44

example, I want it to burst on me

01:06:45

some kind of blot was beautifully drawn

01:06:47

before it was finally

01:06:48

destroyed where the calculation of experience is,

01:06:51

we should all be

01:06:54

encapsulated somewhere they are scattered in different

01:06:56

places of the program I want to

01:06:58

modernize I want to change the

01:07:00

processing of all this and I need to

01:07:03

climb throughout the entire program to look for these

01:07:05

pieces, but there should be a place where

01:07:08

everything is clear how it lies, let's next time

01:07:10

we do this thing beautifully shaped thank you

01:07:12

[applause]

Description:

Практика: http://cs.mipt.ru/python Telegram-группа: https://t.me/tkhirianov_python_2019 Программа курса: https://github.com/tkhirianov/lections_2019/tree/master/semestr_1 Спонсировать: https://www.patreon.com/tkhirianov или https://www.paypal.com/paypalme/tkhirianov или 63900240 9020000598 (карта СБ).

Preparing download options

Popular

HD video

Only sound

All

* — If the video is playing in a new tab, go to it, then right-click on the video and select "Save video as..."

** — Link intended for online playback in specialized players

Questions about downloading video

How can I download "Практика программирования на Python 3, лекция №7" video?

http://unidownloader.com/ website is the best way to download a video or a separate audio track if you want to do without installing programs and extensions.
The UDL Helper extension is a convenient button that is seamlessly integrated into YouTube, Instagram and OK.ru sites for fast content download.
UDL Client program (for Windows) is the most powerful solution that supports more than 900 websites, social networks and video hosting sites, as well as any video quality that is available in the source.
UDL Lite is a really convenient way to access a website from your mobile device. With its help, you can easily download videos directly to your smartphone.

Which format of "Практика программирования на Python 3, лекция №7" video should I choose?

The best quality formats are FullHD (1080p), 2K (1440p), 4K (2160p) and 8K (4320p). The higher the resolution of your screen, the higher the video quality should be. However, there are other factors to consider: download speed, amount of free space, and device performance during playback.

Why does my computer freeze when loading a "Практика программирования на Python 3, лекция №7" video?

The browser/computer should not freeze completely! If this happens, please report it with a link to the video. Sometimes videos cannot be downloaded directly in a suitable format, so we have added the ability to convert the file to the desired format. In some cases, this process may actively use computer resources.

How can I download "Практика программирования на Python 3, лекция №7" video to my phone?

You can download a video to your smartphone using the website or the PWA application UDL Lite. It is also possible to send a download link via QR code using the UDL Helper extension.

How can I download an audio track (music) to MP3 "Практика программирования на Python 3, лекция №7"?

The most convenient way is to use the UDL Client program, which supports converting video to MP3 format. In some cases, MP3 can also be downloaded through the UDL Helper extension.

How can I save a frame from a video "Практика программирования на Python 3, лекция №7"?

This feature is available in the UDL Helper extension. Make sure that "Show the video snapshot button" is checked in the settings. A camera icon should appear in the lower right corner of the player to the left of the "Settings" icon. When you click on it, the current frame from the video will be saved to your computer in JPEG format.

What's the price of all this stuff?

It costs nothing. Our services are absolutely free for all users. There are no PRO subscriptions, no restrictions on the number or maximum length of downloaded videos.