List of Python operators

X+y,x-y
Add, Subtract, "+" can be overloaded as a connector

X*y,x**y,x/y,x%y
Multiply, square, divide, balance, "*" can be overloaded to repeat, "%" number can be overloaded to format

<,<=,>,>=,==,<>,!=
Comparison operators

+=,-=,*=,/=,%=,**=,<<=,>>=,&=,^=,|=
Self-variable operators

X|y
Bitwise OR

X^y
Bitwise XOR OR

X&y
Bitwise-AND

~x
Bitwise REVERSE

X<<,x>>y
X move y-bit left or right

is, are not
Equivalent test

In, not in
Whether to test for members

Or,and,not
logical operators

X[i],x[i:j],x.y,x (...)
Index, Shard, qualified reference, function call

(...)，[...]，{...}，‘...‘
Tuple, list, dictionary, convert to string

2.3.2. Operator precedence
Table 2.2. Operator precedence list (highest to lowest)
operator
Description

' expr '
string conversion

{key:expr,...}
Dictionary

[expr1,expr2 ...]
List

(EXPR1,EXPR2,...)
Tuple

function (expr,...)
Function call

X[index:index]
Slice

X[index]
Subscript index value

X.attribute
Property Reference

~x
Bitwise REVERSE

+x,-x
Positive, negative

X**y
Power

x*y,x/y,x%y
Multiply, divide, modulo

x+y,x-y
Add, subtract

X<<y,x >>y
Shift

X&y
Bitwise with

X^y
Bitwise XOR or

x|y
Bitwise OR

X<y,x<=y,x==y,x!=y,x >=y,x>y
Compare

X is Y,x was not y
equivalent test

X in y,x not in Y
member judgment

not x
Logical no

X and y
Logic with

X or y
logic or

Lambda arg,...: expr
Lambda anonymous function

2.3.3. Truth table
Table 2.3.
Object/constant
Value

""
False

"String"
Really

0
False

>=1
Really

<=-1
Really

() Empty tuple
False

[] Empty list
False

{} Empty Dictionary
False

None
False

2.3.4. Composite expressions
· For and, when a and B are computed, Python calculates a, and if a is false, take a value, and if A is true, Python calculates B and the entire expression
Will take the B-value. Such as:

>>> a,b=10,20

>>> A and B #a is true 20 ·

>>> a,b=0,5 #a is False

>>> A and B. 0 ·

For or, when a or B is computed, Python calculates a, and if A is true, the entire expression takes a value, and if A is false, the expression takes a B-value. Such as:

>>> a,b=10,20

>>> A or B. 10 ·

>>> a,b=0,5

>>> A or B. 5 ·

For Not,not, the "actual value" of the table expression is reversed, and if the expression is true, the not is a false return, if the expression is false, not is the return true. Such as:

· >>> not 2 · False

· >>> not 0 · True

· >>> not ' test ' · False

· >>> not "" • True2.4. Assigning a value to a variable
· Simple assignment, Variable (variable) =value (value).

· >>>a=1

· >>>b=2

· >>>print a,b 1 2 · Multi-variable assignment, variable1,variable2,... =value1,value2,...

· >>>a,b,c=1,2,3

· >>>print A. 1

· >>>print B. 2

· >>>print C. 3 multivariate assignments can also be used for variable exchange, as in the following example:

>>>a,b,c=c,b,a

>>>print A3>>>print B2

>>>print C1 Multi-objective assignment, a=b=variable

· >>> a=b=1

· >>> A. 1

· >>> B. 1

· >>> a=2

· >>> A. 2

· >>> B. 1 · Self-variable assignment, such as +=,-=,*=

List of Python operators