How to define global variables in python

In python, global variables can be defined anywhere outside the function. When using global variables inside a function, you need to use the global keyword to declare the variable as a global variable. Here is an example:

# 定义全局变量
global_var = 10

def my_function():
# 使用全局变量
print(global_var)

def another_function():
# 修改全局变量
global global_var
global_var = 20

# 调用函数
my_function() # 输出：10
another_function()
my_function() # 输出：20

In the above example, global_var is a global variable, which is used and modified in the my_function() function. In the another_function() function, the global keyword is used to declare global_var as a global variable, and then its value is modified. Finally, call the my_function() function again, and you can see that the value of the global variable has been modified to 20.

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