all

当模块中有__all__变量，同时使用from X import *导入模块时，只能导入这个list中的元素携带的方法

all

__all__ = ['testA']

def testA():
    print('this is testA')

def testB():
    print('this is testB')

from my_module2 import *
testA()

this is testA