Кстати у меня такое же поведения.
Покажи значит файл с зависимостями.
Хотя причем здесь джанга я не знаю.
λ ~>mkvirtualenv --no-site-packages univer
New python executable in univer/bin/python
Installing Setuptools..............................................................................................................................................................................................................................done.
Installing Pip.....................................................................................................................................................................................................................................................................................................................................done.
(univer)λ ~>pip install Django==1.4.5 South==0.8.1 django-debug-toolbar==0.9.4 django-celery==3.0.17
Downloading/unpacking Django==1.4.5
Downloading Django-1.4.5.tar.gz (7.7MB): 7.7MB downloaded
Storing download in cache at ./.cache/pip/https%3A%2F%2Fpypi.python.org%2Fpackages%2Fsource%2FD%2FDjango%2FDjango-1.4.5.tar.gz
Running setup.py egg_info for package Django
Downloading/unpacking South==0.8.1
Downloading South-0.8.1.tar.gz (94kB): 94kB downloaded
Storing download in cache at ./.cache/pip/https%3A%2F%2Fpypi.python.org%2Fpackages%2Fsource%2FS%2FSouth%2FSouth-0.8.1.tar.gz
Running setup.py egg_info for package South
Downloading/unpacking django-debug-toolbar==0.9.4
Using download cache from /home/ihor/.cache/pip/https%3A%2F%2Fpypi.python.org%2Fpackages%2Fsource%2Fd%2Fdjango-debug-toolbar%2Fdjango-debug-toolbar-0.9.4.tar.gz
Running setup.py egg_info for package django-debug-toolbar
no previously-included directories found matching 'example'
Downloading/unpacking django-celery==3.0.17
Downloading django-celery-3.0.17.tar.gz (77kB): 77kB downloaded
Storing download in cache at ./.cache/pip/https%3A%2F%2Fpypi.python.org%2Fpackages%2Fsource%2Fd%2Fdjango-celery%2Fdjango-celery-3.0.17.tar.gz
Running setup.py egg_info for package django-celery
no previously-included directories found matching 'bin/*.pyc'
no previously-included directories found matching 'tests/*.pyc'
no previously-included directories found matching 'docs/*.pyc'
no previously-included directories found matching 'extra/*.pyc'
no previously-included directories found matching 'djcelery/*.pyc'
no previously-included directories found matching 'docs/.build'
no previously-included directories found matching 'examples/*.pyc'
Downloading/unpacking pytz (from django-celery==3.0.17)
Could not find a version that satisfies the requirement pytz (from django-celery==3.0.17) (from versions: 2005k, 2005k, 2005k, 2005m, 2005m, 2005m, 2005r, 2005r, 2005r, 2006g, 2006g, 2006g, 2006j, 2006j, 2006j, 2006p, 2006p, 2006p, 2007c, 2007c, 2007c, 2007d, 2007d, 2007d, 2007f, 2007f, 2007f, 2007g, 2007g, 2007g, 2007i, 2007i, 2007i, 2007k, 2007k, 2007k, 2008a, 2008a, 2008a, 2008b, 2008b, 2008b, 2008c, 2008c, 2008c, 2008g, 2008g, 2008g, 2008h, 2008h, 2008h, 2008i, 2008i, 2008i, 2009a, 2009a, 2009a, 2009d, 2009d, 2009d, 2009e, 2009e, 2009e, 2009f, 2009f, 2009f, 2009g, 2009g, 2009g, 2009i, 2009i, 2009i, 2009j, 2009j, 2009j, 2009l, 2009l, 2009l, 2009n, 2009n, 2009n, 2009p, 2009p, 2009p, 2009r, 2009r, 2009r, 2009u, 2009u, 2009u, 2010b, 2010b, 2010b, 2010e, 2010e, 2010e, 2010g, 2010g, 2010g, 2010h, 2010h, 2010h, 2010k, 2010k, 2010k, 2010l, 2010l, 2010l, 2010o, 2010o, 2010o, 2011b, 2011c, 2011c, 2011c, 2011d, 2011d, 2011d, 2011e, 2011e, 2011e, 2011g, 2011g, 2011g, 2011h, 2011h, 2011h, 2011j, 2011j, 2011j, 2011k, 2011k, 2011k, 2011n, 2011n, 2011n, 2012b, 2012b, 2012b, 2012c, 2012c, 2012c, 2012d, 2012d, 2012d, 2012f, 2012f, 2012f, 2012g, 2012g, 2012g, 2012h, 2012h, 2012j, 2012j, 2012j, 2013b, 2013b, 2013b, 2013d, 2013d, 2013d, 2004b)
Cleaning up...
No distributions matching the version for pytz (from django-celery==3.0.17)
Storing complete log in /home/ihor/.pip/pip.log
(univer)λ ~>python
Python 2.7.4 (default, Apr 19 2013, 18:32:33)
[GCC 4.7.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import django
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named django
>>>