What are the priorities of python operators?

Python operator priorities are: 1. Function call, addressing, subscript; 2. Power operation [**], the code is [priorityNumber=2*2**3]; 3. Flip operation ;4. Positive and negative signs, the code is [print 1 2*-3 #output result: -5].

【Related learning recommendations: python tutorial】

Python operator precedence is:

1. Python operator precedence ranking:

An expression may contain multiple There are data objects of different data types connected by different operators; since expressions have multiple operations, different operation orders may produce different results or even incorrect operation errors, because when an expression contains multiple operations, They must be combined in a certain order to ensure the rationality of the operation and the correctness and uniqueness of the results. The priorities decrease from top to bottom, with the topmost operator having the highest priority and the comma operator having the lowest priority. The order in which an expression is combined depends on the precedence of the various operators in the expression. Operators with higher precedence are combined first, operators with lower precedence are combined later, and operators in the same line have the same priority.

# coding=utf-8
#优先级的简单实例
priorityNumber=2+1*4
print priorityNumber #输出结果：6
#优先级使用实例
#以下优先级排名从高到低，在同一运算中，先执行优先级高的再执行低的，以此类推。
#Top 1:函数调用、寻址、下标
#Top 2:幂运算**
priorityNumber=2*2**3
print priorityNumber #输出结果：16
#Top 3:翻转运算~
#Top 4:正负号
print 1+2*-3 #输出结果：-5
#Top 5:*、/、%
print 2+1*2/5 #输出结果：2
#Top 6:+、-
print 3<<2+1 #输出结果：24
#Top 7:<<、>>
#Top 8:按位&、^、|
#Top 9:比较运算符
priority=2*3+2<=2+1*7
print priority #输出结果：True
#Top 10:逻辑的not and or
#Top 11:lambda表达式
2.python运算符优先级使用规律： 
#python优先级使用规律
#1、一般情况下是左结合的
#ps:在没有更高优先级运算符，即只有同级运算符时时从左到右结合
print 1+2+3*5+5 #输出结果：23
#2、出现赋值的时候一般是右结合
#ps:在有赋值运算符时，是右结合，即先算出1+2的值以后再赋值给priority
priority=1+2
print priority #输出结果：23

2. Python operator priority tips:

You may think that the priority of Python operators is not easy to remember, and sometimes it is easy to confuse. In actual application, we may know what to do first and then what to do based on business logic, but we have forgotten the priority of Python operators. What should we do? Here I will teach you a killer trick that will definitely work no matter how many times you try it.

#python运算符优先级大招
'''比如说有这个需求：
去商店买水，买3瓶水，每瓶5块，再买一个绿箭(假设绿箭3块)，总共多少钱？
这个简单的应用非常明显，需要先用乘法再用加法，如果这里你忘记了乘法和加法的优先级，可以这样：
'''
print (3*5)+3 #输出结果：18
#ps: 这只是一个简单的例子，只是为了告诉大家实际应用中实在不行咱就放大招。有备无患。
Python表达式
Python表达式基本概念： 
python中，值、变量和运算符共同组成的整体称为表达式
#python表达式
#1 字符串表达式
"Hello"
#2 计算表达式
2+3
#3 赋值表达式
first=0
#4 变量表达式
first
#5 值表达式
#等等

If you want to learn more about programming, please pay attention to the php training column!

The above is the detailed content of What are the priorities of python operators?. For more information, please follow other related articles on the PHP Chinese website!