Virtual Python Environment builder
virtualenv is a tool to create isolated Python environments.
The basic problem being addressed is one of dependencies and versions, and indirectly permissions. Imagine you have an application that needs version 1 of LibFoo, but another application requires version 2. How can you use both these applications? If you install everything into /usr/lib/python2.7/site-packages (or whatever your platform’s standard location is), it’s easy to end up in a situation where you unintentionally upgrade an application that shouldn’t be upgraded.
Or more generally, what if you want to install an application and leave it be? If an application works, any change in its libraries or the versions of those libraries can break the application.
Also, what if you can’t install packages into the global site-packages directory? For instance, on a shared host.
In all these cases, virtualenv can help you. It creates an environment that has its own installation directories, that doesn’t share libraries with other virtualenv environments (and optionally doesn’t access the globally installed libraries either).
Support Python 3.6.
Upgrade setuptools to 28.0.0.
Upgrade pip to 9.0.1.
Don’t install pre-release versions of pip, setuptools, or wheel from PyPI.
Test for given python path actually being an executable file, #939
Only search for copy actual existing Tcl/Tk directories (PR #937)
Generically search for correct Tcl/Tk version (PR #926, PR #933)
Upgrade setuptools to 22.0.5
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