Yes. Somewhat different use case, although there is overlap. virtualenv allows you to run multiple Python projects in isolated environments on the same machine

Yes. Somewhat different use case, although there is overlap. virtualenv allows you to run multiple Python projects in isolated environments on the same machine, and effortlessly switch between them. These environments are complete in that they contain separate binaries and libraries. They can contain different versions of Python. Virtualenv is not about dependency control and application deployment. It is, however, a part of that solution together with pip and fabric.