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This article mainly introduces "what knowledge points are there in python control flow". In daily operation, I believe many people have doubts about what knowledge points there are in python control flow. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "what knowledge points are there in python control flow"! Next, please follow the editor to study!

2.1 Boolean value

There are two values for Boolean data types: True and False

2.2 if statement

The if statement contains the following sections:

If keyword

Condition (that is, evaluates to True or False)

Colon

Start on the next line, indent the block of code

2.3 while Loop statement

The while loop statement always contains the following parts:

Keyword

Conditions

Colon

An indented block of code (called a clause called while) starting with a new line

[note] you can see that while statements look similar to if statements, except in their behavior. At the end of the if clause, the program continues to execute the statement after if, but at the end of the while clause, the program execution jumps back to the beginning of the whilestatement.

# if statement > spam = 0 > if spam

> > spam = 0 > > while spam > > for i in range: print (I) 12131415 > for i in range: print (I) 0123456789 > > for i in range: print (I) 543210 >

2.8 Import module

Python programs can call a basic set of functions, which is called "built-in functions". Python also contains a set of modules, called "standard libraries". Each module is a python program that contains a set of related functions that can be embedded in your program.

Before you can use a function in a module, you must import the module with the import statement.

The import statement contains the following sections:

Import keyword

Module name

Optional more module names, separated by commas

> import random > for i in range (5): print (random.randint (1m 10)) 61914

2.9 sys.exit () terminate the program ahead of time

When the program reaches the bottom of the instruction, it just terminates. But by calling the sys.exit () function, you can make the program terminate or exit, because this function is in the sys module, so you must import sys before you can use it.

> import sys > while True: print ('typle exit to exit.') Response = input () if response = = 'exit': sys.exit () print (' you typed' + response +'.) typle exit to exit.exit > >

[note]

Boolean operators are and, or, not

A condition is an expression that controls the flow statement and evaluates to a Boolean value.

Code block: some code can be put in a "code block" as a group, and it has three rules:

As indentation increases, the code block begins

Code blocks can contain other code blocks

The indentation is reduced to zero, or the indentation of the code block surrounded by the outside is reduced, and the code block ends.

At this point, the study of "what are the knowledge points of python control flow" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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