`from ... import` vs`import .` [英] `from ... import` vs `import .`

问题描述

我想知道来自urllib导入请求的代码片段

I'm wondering if there's any difference between the code fragment

from urllib import request

和片段

import urllib.request

或者它们是否可以互换。如果它们是可互换的，这是标准/首选语法（如果有的话）？

or if they are interchangeable. If they are interchangeable, which is the "standard"/"preferred" syntax (if there is one)?

谢谢！

推荐答案

这取决于您在引用时如何访问导入。

It depends on how you want to access the import when you refer to it.

from urllib import request
# access request directly.
mine = request()

import urllib.request
# used as urllib.request
mine = urllib.request()

为简单起见，您也可以在导入时自行别名，或者避免屏蔽内置插件：

You can also alias things yourself when you import for simplicity or to avoid masking built ins:

from os import open as open_
# lets you use os.open without destroying the 
# built in open() which returns file handles.

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