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#GoshaPython

00:00:00

I welcome you to a new video lesson in

00:00:01

which we will study cycles and also

00:00:04

operators for cycles. Visit the website

00:00:07

itproger.com. The link to this video lesson

00:00:10

on the site will be in the description of the video. Here

00:00:11

you will find both the code and homework for

00:00:13

each video lesson, thanks to the cycle we

00:00:16

can perform what - code several

00:00:19

times, and the number of times we

00:00:21

can indicate first, let’s

00:00:23

study a loop like while first

00:00:26

of all, we need to write a variable.

00:00:28

Well, for example, the usual way

00:00:30

in loops is to write the variable name as I

00:00:33

Well, it’s already just accepted, let’s

00:00:36

call the variable I and assign it

00:00:38

the value zero, then we write

00:00:40

just this loop of ours while in which we

00:00:42

must set a

00:00:44

condition, remember in the last lesson we

00:00:47

already went through conditional statements and

00:00:49

there we essentially already

00:00:50

figured it out a little, that is what conditions are there

00:00:52

more less equals And so on The

00:00:54

same thing is here for now Well, that is,

00:00:56

while - this is exactly translated While yes,

00:00:59

that is As long as our I is less than 10

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We will execute some piece of

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code, that is, here essentially the same

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as in conditional operators, some

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keyword condition and then a colon,

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that is, nothing new at all, essentially, that’s

00:01:13

what we’re doing here, let’s just

00:01:16

display ours on the screen. This one here

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I, that is, 1 2 3 4 5 6 but this loop

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At the moment it will be infinite

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Why Because each time the loop will

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go through and each time it will be our I

00:01:30

will be equal to zero, respectively, each

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time it will just be well, it will

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fit the condition that it is less than

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ten and accordingly this I will be

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displayed infinitely so we here Let's

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add that our I will be equal to PD

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for example, that is, in one iteration it

00:01:46

will add P2 Well, you can plus o For

00:01:48

example, you can do the same with

00:01:50

multiplication, for example, we will multiply by

00:01:52

two, but here it will be stupid because we are

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not multiplying by 2, that is, accordingly

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again -it’s an infinite loop, so we’ll

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just write the following condition: That in one

00:02:01

iteration, that is, in one circle, our I

00:02:04

will be added to our I,

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P2 will be added, respectively,

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this loop will be output only five times, let’s

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try to run it all and we

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see that it’s output like five times

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it happened, but then 2 4 6 8 Well, that is,

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accordingly, initially zero Then 2

00:02:20

well plus d plus plus two more plus d and

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so on until it became equal children

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if I wrote here for example that

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less is equal to 10 then y we will get this

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cycle six times, respectively, plus

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another ten, for example, and again

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the same thing. I can here, as I already

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said, not a plus, for example, but let's

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do this until it is no less and

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until it is more than a hundred. And for example, here

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here we’ll just put it, well,

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initially, like this, we’ll put it

00:02:50

equal to 1.000 A And we’ll divide it by

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two, each time we’ll divide it by 2

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Accordingly, what we’ll get is that we’ll get

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1.000 initially, then 500 200

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50 125 And then o it’s no longer it fits the

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condition, it will already be less than a hundred,

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so it didn’t fit the condition, that is,

00:03:07

here I think everything is clear to you, we display a

00:03:09

piece of code several times Well,

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accordingly, plus the conditions we ourselves

00:03:14

can fill in as we like, that is, this is

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more than zero this is less than zero Well or rather,

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more than some more than any number is

00:03:21

equal to something, for example, there is

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some variable Well, and so on, yes, that is,

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everything here is basically clear. I

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think now cycle 4 cycle 4 is a little

00:03:31

more complicated, but nevertheless it has

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key properties that

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allow it to be traversed not just by

00:03:37

some condition, for example like here,

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if something is greater than this or equal to

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that and We then execute a loop, it is a

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cycle 4. It allows you to traverse a

00:03:47

string or a list. Well, what

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is a string? I think you already know everything, yes, that

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is, just a string. And we

00:03:54

will study lists a little later with you.

00:03:56

Those who have studied programming

00:03:58

already understand what I’m talking about. Well, if

00:04:00

not, then in the next lessons we will study it

00:04:03

with you. So I have already

00:04:05

prepared a small code And what is happening here in

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it You can rewrite it

00:04:09

or just basically listen to it Firstly, we

00:04:12

have the keyword for Then

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we have a certain variable and the

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keyword in, that is, where we

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will be able to check all this Or what Or

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or how to process that is at the

00:04:24

moment since we haven’t studied lists yet

00:04:26

So I took a regular string Well, the

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string is like a string, that is, here it’s

00:04:30

just the word Hello world What’s

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going on here We get a string - it’s

00:04:36

like MASI it’s like a separate one set for

00:04:39

each letter yes, that is, for example H and l o

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and so on Yes, so we each

00:04:45

take this letter here, multiply it by two,

00:04:48

so it will be displayed, for example, hh and and

00:04:52

ll Well, and then again l then oo Well, and

00:04:55

so on, yes that is, like twice

00:04:57

and at the end I added this little thing

00:04:59

that it means, it means that we won’t

00:05:01

go to a new line every time after Print

00:05:04

because that’s

00:05:06

actually Well in this case at the moment

00:05:08

it wouldn’t be It’s absolutely beautiful, well, for

00:05:10

example, Let’s run it and see what

00:05:12

comes out of it. It turned out well. Well,

00:05:14

firstly, this was revealed from the last cycle.

00:05:16

And here, as you can see, it was displayed twice,

00:05:19

that is, and and then again l oo two

00:05:23

spaces, and so on And so on

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thanks to this N that I wrote here,

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it’s all in one line, if I delete this

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end, then we will notice that we have

00:05:32

everything revealed in this way, that is,

00:05:34

twice But each time Then From a new

00:05:35

line, accordingly, you can multiply by three

00:05:37

Well, so on Well, this is

00:05:38

purely just a game, here the essence is What is what I

00:05:41

want to show you Well, on three you see, that

00:05:43

is, three letters each displays the essence What is

00:05:45

that for It allows you to go through

00:05:47

any

00:05:48

array again, in the future we will

00:05:51

study them either by

00:05:53

line the Wi loop cannot do this, but

00:05:56

it is wonderful, wonderful

00:05:59

in its checks, for example, like this

00:06:01

check in for, we

00:06:03

can’t do this anymore Well, accordingly, each has

00:06:05

its own pros and cons, now let’s

00:06:07

look at the operators that are

00:06:09

used in loops, we will

00:06:11

consider these operators for the for loop,

00:06:13

but they will work exactly the same way and

00:06:16

they are written exactly the same way for the

00:06:19

while loop. Therefore, if anything, you can

00:06:21

use them in the while loop. Well, I

00:06:22

’ll just show them in the for loop. Well, that

00:06:24

is, this is so, first of all, let’s

00:06:27

do it. use some kind of check If J

00:06:30

pa W That is, if this is ours, if we

00:06:33

have reached the letter W, then we will just

00:06:36

use an operator like continue,

00:06:39

what does it do? Well, let’s start with all this, let’s start

00:06:41

the case, that is,

00:06:44

Oops Clear Let’s start this case and what he

00:06:48

did, look, we display

00:06:51

absolutely everything, essentially the same,

00:06:53

only the letter W As you can see, it’s

00:06:56

simply skipped here You see, it’s here,

00:06:58

and here it is, that is, the

00:07:00

contin operator, it skips one iteration, for

00:07:03

example, We’ve reached it, We’ve reached it, we

00:07:05

checked it the condition is that we have J equal to

00:07:07

w and accordingly he simply skipped

00:07:10

this iteration, skipped this circle and

00:07:12

spread to the next well on to the

00:07:15

next iteration in the next iteration,

00:07:17

again it was the same thing that

00:07:19

J early W he again missed and since

00:07:22

we are multiplying by three then also in the third

00:07:23

operation the same thing was that it was

00:07:26

equal to W, he missed it again and then

00:07:28

every time he checked this condition was not

00:07:32

true and accordingly everything was output

00:07:35

exactly the same. If for example I write not

00:07:37

equal to W then we will only get

00:07:39

exactly W you see T W came out and all the

00:07:42

other letters were skipped,

00:07:44

simply now the next operator is the

00:07:46

Bray operator, what does it do, first of all,

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here let’s put it exactly

00:07:50

equal to W So let’s run it all again

00:07:54

here, I’ll clear it all up a little and once again

00:07:56

Now let’s run what it outputs, look at

00:07:59

our Hello word and then three spaces.

00:08:02

And then, in general, you can simply say that it

00:08:04

exited the loop, and it actually

00:08:07

exited the loop, that is, it makes a break. It’s not that

00:08:09

it skips any iteration,

00:08:11

but it exits the loop altogether

00:08:13

accordingly, as soon as it reached the

00:08:16

letter W, we checked the condition, it is equal to w

00:08:20

and it simply exited the loop. That is, we can

00:08:22

say that the compiler, after

00:08:25

we reached W, ended up here, there is

00:08:27

no code here, which means the program was

00:08:29

completed, this is how continue and work work.

00:08:33

this is how Break works. In addition,

00:08:34

there is a third operator

00:08:37

called els and it works in exactly the same way

00:08:40

for both while and for, so

00:08:42

again, I’ll just use it for for.

00:08:44

But remember that for la it

00:08:46

will work the same way.

00:08:48

It is after the cycle after the cycle itself, and

00:08:51

on the same line with this cycle, as you can see, that

00:08:52

is, there are no such

00:08:54

indentations here, you don’t need to do it on the

00:08:56

same line, but for Wi it’s the same

00:08:59

here it would be written down.

00:09:01

Accordingly, what does it do if in

00:09:03

our cycle there is generally a Break and

00:09:06

this break has never worked during the entire cycle,

00:09:08

then our else will be executed,

00:09:11

that is, look, let me

00:09:13

write here in this way. But firstly,

00:09:16

here I will write that we are checking for the

00:09:18

presence of the letter a which is here there is no here,

00:09:22

let's multiply by two Well, so

00:09:24

that there are fewer of these letters And

00:09:26

here I will write that the letters and there are no in in the

00:09:32

word So, accordingly, let me

00:09:35

try to run it all and see

00:09:37

what comes out of it As you can see, it

00:09:40

worked, it came out this is all our

00:09:42

break didn’t work in the loop and therefore the

00:09:45

els operator worked, which just

00:09:47

showed that the letters and are not in the word, well, for

00:09:50

example, it would probably even be

00:09:52

more convenient if we didn’t display anything

00:09:54

on the screen, so I’ll delete it Print

00:09:56

That’s accordingly if Let’s also since

00:09:58

I'm for sch just to see it all Yes,

00:10:01

letters and no conditions Here, accordingly,

00:10:03

if I had written here, for example, W, our

00:10:06

Bray would have worked because W is in

00:10:09

this word and our Es no longer worked,

00:10:12

respectively, nothing came out of

00:10:14

this cycle at all Yes, els didn’t work

00:10:16

Break worked Well, in general, this is the

00:10:19

little thing, that is, again, all the

00:10:21

operators act both with for and with wi, the

00:10:24

loops themselves, as I think, you already understand what

00:10:26

they do, they process Well, either for

00:10:28

are lists either or

00:10:29

process the lines directly with a bang while this

00:10:32

executes the command several times According to

00:10:34

some condition, that is, this is

00:10:36

how to work with loops in the Python language,

00:10:39

that’s all Subscribe, join the

00:10:41

VKontakte group, go to the site

00:10:42

itproger.com All links will be in the description see

00:10:45

you soon bye

Description:

Урок на сайте itProger: https://itproger.com/course/python/6 В этом уроке мы с вами изучим циклы в языке Python. Благодаря циклам мы можем проделывать операции несколько раз всего за пару строк кода. Мы изучим циклы For, While, а также операторы continue, break и else. ✔ Основной сайт: https://itproger.com/ ✔ ------------- Вступай в группу Вк - https://vk.com/prog_life Группа FaceBook - https://www.facebook.com/unsupportedbrowser Instagram: https://www.facebook.com/unsupportedbrowser Telegram: https://t.me/itProger_official Страничка Twitter - https://twitter.com/GoshaDudar - Уроки от #GoshaDudar 👨🏼‍💻 - Все уроки по хештегу #GoshaPython

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