# from tall import b from tall import * print(b) __all__ 模块 引用管理

├── __init__.py
├── tall2.py
└── tall.py

tall.py

a = 23
b = 34
class I:
    def __init__(self):
        print(444)
class J:
    pass
__all__ = [
    'a', 'I',
]

tall2.py
# from tall import b #可以获取b
# print(b)

from tall import *  #不可以获取b
print(b)