How to change built_in module in python

Question

I want to change os.path in os.py, but it failed. path is different in different platform.

os.py

import ntpath as path
sys.modules['os.path'] = path
from os.path import (curdir, pardir, sep, pathsep, defpath, extsep, altsep, devnull)

It turns out that

    from os.path import (curdir, pardir, sep, pathsep, defpath, extsep, altsep,
devnull)
ImportError: No module named path

I think that zetysz is suggesting that you do: vars(os.path).update(vars(ntpath)) -- Which should replace os.path methods with their nt counterparts (or do nothing if you're on windows. . .) — mgilson
– mgilson, Commented Dec 9, 2015 at 8:25
Cannot reproduce your problem. Did you name your program os.py? — Mike Müller
– Mike Müller, Commented Dec 9, 2015 at 8:28
@zetysz, just saw it, im retrieving info, thanks for it mate :) — Netwave
– Netwave, Commented Dec 9, 2015 at 8:28

Mike Müller · Accepted Answer · 2015-12-09 18:07:46Z

2

Your approach should work. Rename the subdirectory os in your current directory to my_os. Python finds your os directory first and tries to import from there.

Adding this line:

__future__ import absolute_import

to the beginning of the os.py avoids this problem by using absolute imports.

edited Dec 9, 2015 at 18:07

answered Dec 9, 2015 at 8:37

Mike Müller

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1 Comment

Sam Over a year ago

I add from __future__ import absolute_import to the beginning. it works. Interpreter will find os.path in sys.modules but current file.

Powi · Accepted Answer · 2015-12-09 08:28:23Z

1

did you try with "__import__" function ?

import mtpath as path
os_path = __import__(path, globals(), locals(), ['curdir', 'pardir', 'sep', 'pathsep', 'defpath', 'extsep', 'altsep', 'devnull']

Then, you can use 'curdir' as :

os_path.curdir

Well, you can also asign it to 'curdir' name as in the documentation :

curdir = os_path.curdir
pardir = os_path.curdir
…

edited Dec 9, 2015 at 8:28

answered Dec 9, 2015 at 8:25

Powi

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2 Comments

Sam Over a year ago

but we can not use it in other files。

Sam Over a year ago

I want to replace os.py modules. The new os.py can be portable. So os.path must be replaced.

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