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Seven basic Python operators

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Mar 31, 2018 pm 03:13 PM

pythonBaseoperator

This article mainly shares with you the seven P-based Python operators. Friends who need it can take a look.

Python language supports the following operators

Arithmetic operators
Comparison (relational) operators
Assignment operator
Logical operator
Bitwise operator
Member operator
Identity operator

1. Arithmetic operator

The following assumes that variable a is 10 and variable b is 20:

Operator	Description	Instance
+	Add - two Add objects	a + b and output the result 30
-	Subtract - get a negative number or one number minus another number	a - b Output result -10
*	Multiply - Multiply two numbers or return a string that is repeated several times	a * b Output result 200
/ Exact division, the result is a floating point number	Division - x divided by y	b / a Output result 2..0
%	Modulo - Return the remainder of division	b % a Output result 0
**	Power - Returns the y power of x	a**b is 10 raised to the 20th power, and the output result is 1000000000000000000000
//	Take integer division - return the integer part of the quotient	9//2 Output result 4, 9.0//2.0 Output result 4.0

2. Comparison operator

The following assumes that variable a is 10 and variable b is 20:

Operator	Description	Instance
==	Equal - Compare whether objects are equal	(a == b) Return False.
!=	Not equal to - Compares whether two objects are not equal	(a != b) Returns True.
	Not equal to - Compares whether two objects are not equal	(a b) Returns True. This operator is similar to != .
>	Greater than - Returns whether x is greater than y	(a > b) Returns False.
	Less than - Returns whether x is less than y. All comparison operators return 1 for true and 0 for false. These are equivalent to the special variables True and False respectively. Note the capitalization of these variable names.	(a
>=	Greater than or equal to - Returns whether x is greater than or equal to y.	(a >= b) Returns False.
	Less than or equal to - Returns whether x is less than or equal to y.	(a

3. AssignmentOperator

The following assumes that variable a is 10 and variable b is 20:

##+=Additional assignment operatorc += a is equivalent to c = c + a-=Subtractive assignment operatorc -= a is equivalent to c = c - a*=Multiplicative assignment operatorc *= a is equivalent to c = c * a/=Division assignment operatorc /= a is equivalent to c = c / a##%= **=//=

4. Logical Operator

The following assumes that variable a is 10 and b is 20:

Operator	Description	Example
=	Simple assignment Operator	c = a + b assigns the operation result of a + b to c




Modulo assignment operator	c %= a is equivalent to c = c % a
power Assignment operator	c = a is equivalent to c = c a
Integer division assignment operator	c //= a is equivalent to c = c // a

5. Bit operators

The following assumes that variable a is 60 and b is 13:

Bitwise operators treat numbers as binary to perform calculations. The bitwise operations in Python are as follows:

Operator	Logical expression	Description	Example
and	x and y	Boolean AND - If x is False, x and y returns False, otherwise it returns the calculated value of y.	(a and b) returns 20.
or	##x or y	Boolean "or" - If x is non-zero, it returns the value of x, otherwise it returns the calculated value of y.	(a or b) returns 10.
not	not x	Boolean "not" - if x is True, returns False. If x is False, it returns True.	not(a and b) returns False

##|Bitwise OR operator(a | b) The output result is 61, binary interpretation: 0011 1101^bitwise exclusive Or operator (a ^ b) output result 49, binary interpretation: 0011 0001~Bitwise negation operator(~a) The output result is -61, binary interpretation: 1100 0011, in the complement form of a signed binary number. Left shift operatora >>Right shift operatora >> 2 The output result is 15, binary interpretation: 0000 1111

6. Member Operator

Operator	Description	Example
&	Bitwise AND operator	(a & b) The output result is 12, binary interpretation: 0000 1100

Operator	Description	Instance
#in	Returns True if the value is found in the specified sequence, False otherwise.	x is in the y sequence, and returns True if x is in the y sequence.
not in	Returns True if the value is not found in the specified sequence, otherwise returns False.	x is not in the y sequence, if x is not in the y sequence return True

7. Identity Operator

Identity operator is used to compare the storage locations of two objects

Operator	Description	Example
is	is is used to determine whether two identifiers refer to an object.	x is y, if id(x) is equal to id(y), is returns the result 1
is not	is not is to determine whether the two identifiers are the same Referenced from different objects	x is not y, if id(x) is not equal to id(y). is not Returns result 1

Operator precedence

The following table lists all operators from highest to lowest precedence:

##**Index (highest precedence)~ + -Bitwise flip, unary plus sign and minus sign (the last two methods are named +@ and -@)* / % //Multiplication, division, modulo and integer division##+ ->> &##^ |bit operatorComparison operatorEqual operatorAssignment operatorIdentity operator

Operator	Description



Addition and subtraction
Right shift, left shift operator
bits' AND'
	## >=
	== !=
	= %= /= //= -= += = *=
	is is not

in not in	Member operator
not or and	Logical operator

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