[Python-Dev] Virtualenv not portable from Python 2.7.2 to 2.7.3 (os.urandom missing) (original) (raw)

Jason R. Coombs jaraco at jaraco.com
Wed Mar 28 20:22:50 CEST 2012

We encountered it as well.

To reproduce, using virtualenv 1.7+ on Python 2.7.2 on Ubuntu, create a virtualenv. Move that virtualenv to a host with Python 2.7.3RC2 yields:

jaraco at vdm-dev:~$ /usr/bin/python2.7 -V

Python 2.7.3rc2

jaraco at vdm-dev:~$ env/bin/python -V

Python 2.7.2

jaraco at vdm-dev:~$ env/bin/python -c "import os; os.urandom()"

Traceback (most recent call last):

File "", line 1, in

AttributeError: 'module' object has no attribute 'urandom'

This bug causes Django to not start properly (under some circumstances).

I reviewed the changes between v2.7.2 and 2.7 (tip) and it seems there was substantial refactoring of the os and posix modules for urandom.

I still don't fully understand why the urandom method is missing (because the env includes the python 2.7.2 executable and stdlib).

I suspect this change is going to cause some significant backward compatibility issues. Is there a recommended workaround? Should I file a bug?

Regards,

Jason

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