operator

Target

It is a symbol used to complete basic arithmetic operations and is used to process four arithmetic operations

operator	describe	example
+	add	10 + 20 = 30
-	reduce	10 - 20 = -10
*	take	10 * 20 = 200
/	remove	10 / 20 = 0.5
//	Divide	Returns the integer part (quotient) of the division 9 // 2 outputs the result 4
%	take the remainder	Returns the remainder of division 9 % 2 = 1
**	power	Also known as power, power, 2 ** 3 = 8

In Python, *operators can also be used on strings, and the result of the calculation is the result of repeating the string a specified number of times.

In [1]: "-" * 50
Out[1]: '----------------------------------------'

operator	describe
==	Checks whether the values of the two operands are equal , if so, the condition is true and returns True
!=	Checks if the values of the two operands are not equal , if so, the condition is true and returns True
>	Check if the value of the left operand is greater than the right operand, if so, the condition is true, return True
<	Check if the value of the left operand is less than the right operand, if so, the condition is true and return True
>=	Check if the value of the left operand is greater than or equal to the value of the right operand, if so, the condition is true, return True
<=	Check if the value of the left operand is less than or equal to the value of the right operand, if so, the condition is true, return True

In Python 2.x , you can also use the <>operator to judge not equal to

!=In Python 2.x, it can also be used to judge not equal to

operator	logical expression	describe
and	x and y	Returns True only if both x and y are True, otherwise returns False as long as either x or y has a value of False
or	x or y	Returns True as long as either x or y has a value of True, and returns False only if both x and y are False
not	not x	Returns False if x is True and returns True if x is False

In Python, you =can assign values to variables using
In arithmetic operations, in order to simplify the writing of code, Pythona series of assignment operators corresponding to arithmetic operators are also provided
Note: Spaces cannot be used between assignment operators

operator	describe	example
=	simple assignment operator	c = a + b assigns the result of the operation of a + b to c
+=	addition assignment operator	c += a is equivalent to c = c + a
-=	Subtraction assignment operator	c -= a is equivalent to c = c - a
*=	multiplication assignment operator	c = a is equivalent to c = c a
/=	division assignment operator	c /= a is equivalent to c = c / a
//=	Integer division assignment operator	c //= a is equivalent to c = c // a
%=	modulo (remainder) assignment operator	c %= a 等效于 c = c % a
**=	幂赋值运算符	c = a 等效于 c = c a