Python運算子優先順序範例

下表列出了從最高優先順序到最低優先順序的所有運算子，如下所示 -

序號	運算子	描述
1	**	指數(次冪)運算
2	~ + -	二補數，一元加減(最後兩個的方法名稱是+@和-@)
3	* / % //	乘法，除法，模數和地板除
4	+ -
5	>> <<	向右和向左位移
6	&	按位元與
7	^	按位元互斥或和常規的「OR」
8	<= < > >=	比較運算子
9	<> == !=	等於運算子
10	= %= /= //= -= += *= **=	賦值運算子
11	is is not	身份運算子
12	in not in	成員運算子
13	not or and	邏輯運算子

範例

#! /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)

將上面程式碼儲存到檔案： operators_precedence_example.py 中，執行結果如下 -

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