python 全局变量使用（1）

x = 50

def func():
    global x
    print('This function is now using the global x!')
    print('Because of global x is: ', x)
    x = 2
    print('Ran func(), changed global x to', x)

print('Before calling func(), x is: ', x)
func()
print('Value of x (outside of func()) is: ', x)

结果

 

Before calling func(), x is: 50

This function is now using the global x!

Because of global x is: 50

Ran func(), changed global x to 2

Value of x (outside of func()) is: 2 

非常简明