Python运算符优先级示例

下表列出了从最高优先级到最低优先级的所有运算符，如下所示 -

序号	运算符	描述
1	**	指数(次幂)运算
2	~ + -	补码，一元加减(最后两个的方法名称是+@和-@)
3	* / % //	乘法，除法，模数和地板除
4	+ -
5	>> <<	向右和向左位移
6	&	按位与
7	^	按位异或和常规的“OR”
8	<= < > >=	比较运算符
9	<> == !=	等于运算符
10	= %= /= //= -= += *= **=	赋值运算符
11	is is not	身份运算符
12	in not in	成员运算符
13	not or and	逻辑运算符

实例

#! /usr/bin/env python
#coding=utf-8
#save file : operators_precedence_example.py

#!/usr/bin/python3

a = 20
b = 10
c = 15
d = 5

print ("a:%d b:%d c:%d d:%d" % (a,b,c,d ))
e = (a + b) * c / d       #( 30 * 15 ) / 5
print ("Value of (a + b) * c / d is ",  e)

e = ((a + b) * c) / d     # (30 * 15 ) / 5
print ("Value of ((a + b) * c) / d is ",  e)

e = (a + b) * (c / d)    # (30) * (15/5)
print ("Value of (a + b) * (c / d) is ",  e)

e = a + (b * c) / d      #  20 + (150/5)
print ("Value of a + (b * c) / d is ",  e)

将上面代码保存到文件： operators_precedence_example.py 中，执行结果如下 -

F:\worksp\python>python operators_precedence_example.py
a:20 b:10 c:15 d:5
Value of (a + b) * c / d is  90.0
Value of ((a + b) * c) / d is  90.0
Value of (a + b) * (c / d) is  90.0
Value of a + (b * c) / d is  50.0