How to reset virtualenv and pip?

问题

I installed virtualenv on my Ubuntu 10.04 server.

Now when I do pip freeze it shows me the following packages:

Django==1.2.4
distribute==0.6.10
python-apt==0.7.94.2ubuntu6.2
virtualenv==1.5.1
wsgiref==0.1.2

When I do "pip uninstall Django" it says:

pip uninstall Django
Uninstalling Django:
Proceed (y/n)? y
Successfully uninstalled Django

Ideally this should uninstall Django but it doesn't. I can still see the same packages when I do "pip freeze".

Now bear with me, the other weird thing is that when I create a virtualenv and then do "pip freeze" inside it, I see only one package and that is "wsgiref" which is weird because it should ideally be blank.

Also, in spite of creating this virtualenv with --no-site-packages I can still create a new django project with "django-admin.py startproject".

When I start python interpreter inside this virtualenv and do "import django" it gives me the error "No module named django".

Also when I try to install "pip install Django" inside the virtualenv it asks for sudo permissions which shouldn't happen ideally.

How do I sort out this mess. Any way to just reset everything pep and virtualenv?

回答1:

As far as I can tell, the only purpose of a venv is to manage dependencies.

You should be safe to just deactivate the venv, delete it, and create a new one using virtualenv venv; source venv/bin/activate.

This will give you a fresh start.

回答2:

This question is old, but it got bumped to the front page, so it's hard to discern which versions of pip and virtualenv you are using.

There are a few things we can do to straighten this, nonetheless.

1. Exit all virtualenvs, and check your $PYTHONPATH. Make sure it's empty; else run unset PYTHONPATH.
2. Create a fresh virtualenv at myenv using virtualenv --no-site-packages myenv.
3. Activate myenv and check your $PYTHONPATH again. It should only have myenv.
4. Run pip with an absolute path, like so myenv/bin/pip freeze.
5. If pip is not available inside your virtualenv, you may have to install it manually.

Related: virtualenv --no-site-packages and pip still finding global packages?

Finally, start a python shell using myenv/bin/python, then run:

>>> import sys
>>> sys.path

If pip can find wsgiref, then wsgiref must be in one of the paths in sys.path. Use that clue!

回答3:

Best way to reset the virtual environment.

Windows environment use the below command:

pip freeze > unins && pip uninstall -y -r unins && del unins

Linux environemnt use the below command:

pip freeze > unins && pip uninstall -y -r unins && rm unins

来源：https://stackoverflow.com/questions/4913561/how-to-reset-virtualenv-and-pip