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I use Emacs for a number of tasks and as I am starting to work with Python I would like to keep using Emacs to code in Python.
I have set up a virtualenv for Python3, and it is working as desired. I also have Emacs 24.5 installed with the latest version of Emacs Prelude.
When I edit an Python source file all I expected is working -- code completion, object inspection, etc. -- but for my system wide Python installation, not for the virtual environment I have set up for the project.
How can I tell Emacs to use the virtual environment for a given project?
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Once you open your python file in Emacs, you will need to start the python process with: M-x run-python or C-c C-p , which creates an inferior python shell buffer. This buffer will be created by a horizontal split, and the active buffer will be the one containing the python file.
Elpy has support for virtual environments built in via Pyvenv. Pyvenv can also be installed as a standalone package. Pyvenv added support for project-specific virtual environments in 2014, but I haven't experimented with them myself so I don't know how well it works.
If you want to code Python in Emacs, I would recommend installing Elpy. It really simplifies the process of getting a good environment up-and-running, and it is modular so you can deactivate sections over time when you decide you want a more tailored package.
You may also want to take a look at virtualenvwrapper.el, although Pyenv looks like it has more functionality. There's also auto-virtualenv, which attempts to automate the virtual environment discovery and activation.
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