I've seen 'virtualenv' refer to both an environment with isolated packages, and the tool that creates that environment. Can be confusing.
miniblog.
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Ever wondered if pip has broken some dependencies in your virtualenv? The patch I proposed has landed!
I'm taking the policy of system Python packages installed from distro packages (not pip), but otherwise use virtualenv. Mostly works.
When in doubt with #python packaging, you just want Pip, virtualenv and distribute. http://t.co/6eehYDva has more info, but it's less clear.