A brief introduction to operators in python3

This article brings you a brief introduction to operators in python3. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Expression

• A line of code composed of one or several numbers or variables and operators

• usually Returns a result

Operator

• Operator classification:
  

• Arithmetic operators

• Relational operators

• Assignment operators

• Logical operators

• Bit operations

• Member operations

• Identity operators

Arithmetic operators

• Perform arithmetic operations

• ##Python has no increment and decrement operators

• Addition operation - Subtraction operation * Multiplication operation / Division operation (if there is a decimal after the operation, include the decimal) % Remainder operation // Quotient operation ** Power operation

Comparison operator

• Compares two variables or values

• The result of the operation is a Boolean value , that is, false/true

• == equal sign != not equal to > greater than < less than >= greater than or equal to <= less than or equal to

Assignment operator

• =, assignment

• =, is an abbreviation (a =b is equivalent to a=a b), the same principle Also: -=

  = /= //= %= *=

##Logical operator

for Boolean Values ​​are operated on
and logical AND
or logical OR
not logical NOT
Operation rules:

• 
  

and is regarded as multiplication, or is regarded as addition
True is regarded as 1, False is regarded as 0
The logical operation can be converted into integer mathematical operation
The final result is 0, otherwise it is False For True

Short-circuit problem of logical operations

• 
  

Logical operation expressions are calculated according to the order of operations. Once If the future value of the entire formula can be determined, the calculation will no longer be performed and the

#member operator

in is used. Test whether a variable is a member of another variable
not in
identity operator

is is used to detect whether two variables are the same variable
not is
Operator priority issue

Brackets have the highest priority
Priority table

• **  指数 (最高优先级)
  ~ + -   按位翻转, 一元加号和减号 (最后两个的方法名为 +@ 和 -@)
  * / % //    乘，除，取模和取整除
  + - 加法减法
  >> <<   右移，左移运算符
  &   位 &#39;AND&#39;
  ^ | 位运算符
  <= < > >=   比较运算符
  <> == !=    等于运算符
  = %= /= //= -= += *= **=    赋值运算符
  is is not   身份运算符
  in not in   成员运算符
  not or and  逻辑运算符

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