内置函数--global() 和 local()

>>> globals()
{'__spec__': None, '__package__': None, '__builtins__': <module 'builtins' (built-in)>, '__name__': '__main__', '__doc__': None, '__loader__': <class '_frozen_importlib.BuiltinImporter'>}
>>> a = 1
>>> globals() #多了一个a
{'__spec__': None, '__package__': None, '__builtins__': <module 'builtins' (built-in)>, 'a': 1, '__name__': '__main__', '__doc__': None, '__loader__': <class '_frozen_importlib.BuiltinImporter'>}

>>> locals()
{'__package__': None, '__loader__': <class '_frozen_importlib.BuiltinImporter'>, '__doc__': None, '__name__': '__main__', '__builtins__': <module 'builtins' (built-in)>, '__spec__': None}
>>> a = 1
>>> locals() # 多了一个key为a值为1的项
{'__package__': None, '__loader__': <class '_frozen_importlib.BuiltinImporter'>, 'a': 1, '__doc__': None, '__name__': '__main__', '__builtins__': <module 'builtins' (built-in)>, '__spec__': None}

>>> def f():
    print('before define a ')
    print(locals()) #作用域内无变量
    a = 1
    print('after define a')
    print(locals()) #作用域内有一个a变量，值为1
>>> f
<function f at 0x03D40588>
>>> f()
before define a 
{} 
after define a
{'a': 1}

>>> def f():
    print('before define a ')
    print(locals()) # 作用域内无变量
    a = 1
    print('after define a')
    print(locals()) # 作用域内有一个a变量，值为1
    b = locals()
    print('b["a"]: ',b['a']) 
    b['a'] = 2 # 修改b['a']值
    print('change locals value')
    print('b["a"]: ',b['a'])
    print('a is ',a) # a的值未变
>>> f()
before define a 
{}
after define a
{'a': 1}
b["a"]:  1
change locals value
b["a"]:  2
a is  1
>>> 

def m():
    a = 10
    print("全局变量:", globals())
    print("局部变量:", locals())
m()

全局变量: {'__name__': '__main__', '__doc__': '内置函数', '__package__': None, '__loader__': <_frozen_importlib_external.SourceFileLoader object at 0x0291A410>, '__spec__': None, '__annotations__': {}, '__builtins__': <module 'builtins' (built-in)>, '__file__': 'D:/PycharmProjects/test/dir05/neiZhiHanShu.py', '__cached__': None, 'm': <function m at 0x02A53738>}<br>
局部变量: {'a': 10}