def make_counter():

    global count

    count = 0

    def counter():

        # nonlocal count

        global count

        count += 1

        return count

    return counter

mc = make_counter()

print(mc())

print(mc())

print(mc())

#

#

#

# 全局变量在函数内部可以任意调用

hehe=6

def f():

    print(hehe)

f()

print(hehe)

#

#

# 注意这里在函数先输出hehe变量时,即先使用了它,后定义它是2,所以程序认为它是局部变量,会报先使用后定义的错误

hehe=6

def f():

    print(hehe)

    hehe=2

f()

print(hehe)

# UnboundLocalError: local variable 'hehe' referenced before assignment

# 这个是先定义后使用,函数内的hehe同样是局部变量

hehe=6

def f():

    hehe=2

    print(hehe)

f()

print(hehe)

#

#

hehe=6

def f():

    global hehe

    print(hehe)

    hehe=3

f()

print(hehe)

#

#

参考: https://www.cnblogs.com/summer-cool/p/3884595.html