What are the usages of python global?

The role of the global statement: When writing a program, if you want to reassign a variable outside a function, and this variable will act on many functions When , you need to tell python that the scope of this variable is a global variable. At this time, using the global statement can become this task, which means that the global variables cannot be modified without using the global statement.

python global usage:

Usage 1: Using global, you can make local variables in the method globally available and in other files Can also be quoted.

def fun():
   global c
   c =0
fun()
print(c)
打印：
0

Usage 2: Reassign global variables in local functions.

a = 0
b = 0
def fun():
   global a       # 在a  之前添加 global
   a = 2
   b = 2
fun()
print(a)
print(b)
打印：
2
0

Recommended tutorial: "Python Tutorial"

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