I needed a virtual environment with all the global packages included. I created one, and the global Django version is 1.3.1. Now, I need to upgrade the Django version to 1.4 only in my virtual environment. I switched to my environment by activating it, and tried
sudo pip install Django=1.4
It was installed,not in the virtual env but in the global dist-packages.
How to install a package only in the virtual environment?
After you switch to the virtual environment with the activate script. Just use pip install Django==1.4 no sudo needed.
Alternately you can use pip install -E=/path/to/my/virtual/env Django==1.4 in which case you don't need to switch to the virtual environment first.
If you just want to upgrade a package and don't know the version number you want to upgrade to you can use
pip install <package_name> --upgrade
in your virtualenv. So in your case above the following would work as well:
pip install django --upgrade
Instead of --upgrade just -U is also enough.
get your answer from
http://djangopaper.com/post/9334151791/install-multiple-django-version-using-virtualenvwrapper
