Python导入不一致的行为

Question

我有一个这样的py文件,出错了.

from world import acme

def make_stuff_happen():
    acme.account.foo()       # Works
    acme.subscription.bar()  # FAIL: "module 'object' has no attribute 'subscription'"

make_stuff_happen()

但这有效!

from world import acme 
from world.acme import subscription

def make_stuff_happen():
    acme.account.foo()  # Works
    subscription.bar()  # Now this works.

make_stuff_happen()

我只能说是WTF,这可能是什么造成的呢？这样的行为应该至少是两个一致的acme.account和acme.subscription.

谢谢!

更新 - acme文件夹的文件夹结构:

acme
|-- __init__.py
|-- account.py
|-- catalog.py
|-- core.py
|-- proxy.py
|-- subscription.py
`-- utils.py

而且__init__.py完全空白.

Answer 1

子模块__init__.py在模块文件夹中的文件中引用.似乎subscription没有在acme's中引用__init__.py.

但是,当你这样做时import world.acme.subscription,它知道在没有交谈的情况下去挖掘那个文件夹__init__.py.

According to your description of __init__.py as being empty, you should import subscription in __init__.py.

More on how modules are set up can be seen in the documentation. There is a pretty good example setting up a sound module.