Python variables and data types

Hexadecimal is represented by 0x prefix and 0-9 a-f

A string is any text enclosed in '' or ""

A Boolean value has only two values ​​​​True and False

Boolean values ​​can be operated with and or not

The null value is a special value in Python, represented by None. None cannot be understood as 0, because 0 is meaningful, and None is a special null value

The PRint statement can input specified text to the screen

The print statement can also keep up with multiple strings

Python comments start with #, and the following text until the end of the line is considered a comment

Some code you don’t want to run, but you don’t want to delete it, you can use comments to temporarily block it

Equal sign = is an assignment statement , you can assign any data type to a variable. The same variable can be assigned repeatedly, and it can be a variable of different types. It cannot be equivalent to the mathematical equal sign ==

Strings contain both ' and ". Strings need to be To escape, insert one in front of it to escape

Commonly used escape characters: not included in the content of the string n represents a newline t represents a tab character \ represents the character itself

Add a in front of the string The prefix r indicates that this is a raw string, and the characters inside do not need to be escaped. However, the r'...' notation cannot represent multi-line strings, nor can it represent strings containing 'and'. If you want to represent a multi-line string, you can use '''...''' to express it. You can also add r in front of the multi-line string to turn this multi-line string into a raw string, r''' ...'''

unicode string is used to input Chinese, u'', ur'''...'''

If you encounter UnicodeDecodeError, add a comment to the first line # -*- coding: utf-8 -*-, then use Notepad++ to save as... and select UTF-8 format to save

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