Last week we talked about managing multiple Pythons using pyenv.
But still we are lacking something like the Gemfile in Ruby for managing the version of those Python packages in a Python project. And here comes the Python virtualenv.
We can create different virtualenv on the same machine and each of them has its own Python binary, the pip package and the all other standard Python libraries needed to run the Python. In other words, each virtualenv acts like the Gemfile in a particular Python project.
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