Running a virtualenv with a custom-built Python

For my attempt to improve the asyncio.as_completed Python standard library function I needed to build a local copy of cpython (the Python interpreter).

To test it, I needed the aiohttp module, which is not part of the standard library, so the easiest way to get it was using virtualenv.

Here is the recipe I used to get a virtualenv and install packages using pip with a custom-built Python:

$ ~/code/public/cpython/python -m venv env
$ . env/bin/activate
(env) $ pip install aiohttp
(env) $ python mycode.py

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