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Уроки Python / Конструкция if elif else - если то иначе - Условная инструкция

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Channel: Изучаем мир ИТ / Олег Шпагин / Программирование

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оператор if

ооп python

циклы в python

00:00:00

the simplest programs in python cannot be

00:00:03

executed linearly,

00:00:04

that is, not a single line of the program

00:00:06

will be skipped and all lines will be

00:00:08

executed one after another; for example, there

00:00:11

could be a program that asks for the

00:00:13

name and age of the user and then

00:00:16

greets him,

00:00:17

well, that is, this is a really simple

00:00:19

program in reality Of course, not all

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programs are so simple, for example, you may

00:00:25

need a different greeting for

00:00:27

users of different ages in

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order to execute different lines of the program

00:00:32

for different conditions in Python there is such a

00:00:35

thing as a conditional operator in the general form of

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its use it looks like this, first

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you need to write a keyword then

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the conditions that we want check

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and at the end of the line there should be: if

00:00:49

you put a colon in the wrong place

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it will be considered an error and such a

00:00:54

program will not even run so

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be careful

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the code that should be executed under this

00:01:00

condition must be written hundred stepped in

00:01:02

4 spaces in general indented and this is very

00:01:06

important part of python and it is by the ledges that

00:01:08

python understands how the

00:01:11

lines of the program will be executed, that is, if you write it

00:01:14

like this, both of these lines will be executed only

00:01:16

if the condition is met, but

00:01:18

if you write it like this, this line

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will always be executed, regardless

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of whether the conditional operator worked or

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not, okay in this in the equation there is only

00:01:29

one cat left in the poke and this is the condition

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in order to check the conditions in

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Python there are special

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comparison operators and they work almost the

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same as arithmetic operators, that

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is, there is a left operand and a

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right operand and as a result of the operation of

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the operator a certain result will be obtained

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and if, for example, the addition operator will return the

00:01:50

sum as a result of the work, then the

00:01:52

comparison operator will return more than true

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if the left operand is greater than the right one and false

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in any other case is

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true and false is the value of a special

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logical or Gul data type,

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this type has only two possible values

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true and false

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and the type is named after the

00:02:11

English mathematics and logic of George

00:02:13

Boole in general, the code under the conditional operator

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will be executed only when the condition

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is true and I will leave a link to all

00:02:21

comparison operators in the description. There is another

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important point in all these matters with

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comparisons and Boolean types - this is the

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conversion of other types to the logical

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data type if, for example, you convert

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an integer to a logical type, then 0 will be false

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and any other value will be true, if you

00:02:42

perform the same transformation with a

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string, then any non-empty string will be

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true

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and an empty string will be false. This representation of

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other data types makes it possible to

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write simpler and more concise code,

00:02:55

for example, if the user has nothing will not

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enter here there are three ways

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to check this, the first is incorrect, this is to

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get the length of the entered string and

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compare it with zero, the second is the same

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thing, compare the entered string with an empty

00:03:10

string, in technical terms, both of these

00:03:13

methods work, but they look too

00:03:15

crooked for such a cool language as

00:03:17

python in in general 3 and the correct way is to

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simply write the name of the variable in the conditions

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and if the user enters at least something the

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condition will work because it is not an empty

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string, it is true. Please note that you do

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not need to force a variable conversion to a Boolean type in a conditional

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operator, such a conversion will be

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done automatically, of course, if

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necessary compare the length of a string with a

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certain number or the string itself

00:03:45

needs to be compared with some value, there is

00:03:47

nothing left other than the first and second methods

00:03:51

and remember that practice when learning

00:03:54

programming is very important, you can spend

00:03:56

hours watching training videos or

00:03:59

reading books, but if you don’t write code,

00:04:01

it’s a pipe, however It’s worth trying

00:04:04

to write at least one program, and

00:04:06

beginners usually have many

00:04:08

questions about how to install python and the

00:04:11

development environment, whether

00:04:13

the program is working correctly, where the error occurred, and how

00:04:16

to understand the interpreter’s scary messages

00:04:19

in general, so that the first steps in this

00:04:21

difficult task are simple and

00:04:23

effective, we have developed our own

00:04:26

unique learning environment for beginners

00:04:29

for years pie dot com we give theory

00:04:31

in small portions and to consolidate the

00:04:33

acquired knowledge you will have to write

00:04:36

programs, these programs are checked by our

00:04:39

specially trained robot, he also

00:04:41

points out errors and makes tips

00:04:43

for correcting them,

00:04:44

that is, you get feedback

00:04:47

almost instantly

00:04:48

install nothing no need, everything

00:04:51

works directly from the browser and the programs are

00:04:53

stored in the cloud so you can

00:04:55

study at any time and anywhere,

00:04:58

the main thing is that you have the Internet, try

00:05:01

this is a great way to start

00:05:03

programming, the

00:05:04

link will be in the description and by the way, if you

00:05:08

leave a comment under this video you

00:05:10

will be able to watch the work of the conditional

00:05:13

operator, if the comment is

00:05:15

short it will be displayed in full, but

00:05:18

if the comment is long,

00:05:20

only part of it will be displayed

00:05:22

and at the bottom there will be a read more button

00:05:25

that will open it in its entirety. Of

00:05:28

course, I haven’t seen the YouTube source code, but

00:05:30

I bet that this was done

00:05:32

using the conditional operator and checks

00:05:35

for a certain string length

Description:

Программирование на Python для начинающих: Зачем нужен условный оператор ветвления if. Использование операторов сравнения. Зачем нужны отступы при использовании условного оператора. Булевский тип данных. Какие строки и числа являются истиной, а какие ложью. Список операторов сравнения https://letpy.com/handbook/comparison-operators/ 🐍 Уроки по Python на LETPY, бесплатный тестовый период https://letpy.com/

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