Is it possible to import to the global scope from inside a function (Python)?

问题

I am trying to import a module from inside a function and have it be available to my whole file the same way it would be if I imported outside any functions and before all the other code. The reason it is in a function is because I don't have much control over the structure of the script. Is this possible without resorting to things like hacking __builtin__ or passing what I need all around my code?

回答1:

How about something like globals()["os"] = __import__("os")?

I guess this could be wrapped in a generic function if you wanted since the module name is a string.

回答2:

Seeing your new comments, I want to emphasize that this sounds unnecessary. You're actually modifying the script more by importing within a function than by importing at the top of the script in the normal way. Still, in the spirit of answering the question asked, I'm leaving my previous answer.

I'm honestly not certain this is the correct way to do this, but a quick check confirms that if you declare the module name as global within the function before importing, it is imported into the global namespace.

>>> def import_re():
...     global re
...     import re
... 
>>> re
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 're' is not defined
>>> import_re()
>>> re
<module 're' from '/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/re.pyc'>

Don't do this unless you really have to -- and then write it in big red letters, so to speak.

来源：https://stackoverflow.com/questions/6347588/is-it-possible-to-import-to-the-global-scope-from-inside-a-function-python

标签

python

import

globals