a = 'hello'

def hi():

    b = 'world'

    print(b)

    print(a) #先在函数内部找，找不到在全局变量中找

    print(locals()) #函数内部的局部变量

    print(globals()) #全局变量

hi()

控制台输出：

world

hello

{'b': 'world'}

{'a': 'hello', '__cached__': None, '__package__': None, '__spec__': None, 'hi': <function hi at 0x000000000348CBF8>, '__name__': '__main__', '__loader__': <_frozen_importlib.SourceFileLoader object at 0x00000000034E0550>, '__builtins__': <module 'builtins' (built-in)>, '__doc__': None, '__file__': 'D:/script/kecheng/lesson3/function.py'}

def test():

    return 'hahaha'

    print('yayayay')

test()

控制台输出：为空