python - 在 as 之后用逗号导入

Question

我正在查看一个 repo，发现了一条有点奇怪的线

from flask.ext.testing import TestCase as Base, Twill

这样导入是什么意思？我以前没见过它，不幸的是很难用谷歌搜索。

Answer 1

该行告诉 Python 从包 flask.ext.testing 中导入 TestCase 和 Twill，但是要导入 TestCase 在 Base 的名称下。

来自docs :

If the module name is followed by as, then the name following as is bound directly to the imported module.

下面是来自re module 的search 和match 函数的演示。 :

>>> from re import search as other, match
>>> match  # The name match refers to re.match
<function match at 0x02039780>
>>> other  # The name other refers to re.search
<function search at 0x02048A98>
>>> search  # The name search is not defined because it was imported as other
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'search' is not defined
>>>