How to create a Conda environment that uses PyPy?

Question

So here is my issue. I\'ve managed to install PyPy using conda with the following command:

conda install -c conda-forge pypy3.5

Unfortunately,

Answer 1

Conda now supports PyPy more smoothly.

conda config --set channel_priority strict
conda create -c conda-forge -n pypy pypy
conda activate pypy

There's still a lot of work being done to build conda packages for pypy, but there's already a lot of compatibility. For example,

conda install mpmath
conda install numpy

both work now.

Reference: https://conda-forge.org/blog/posts/2020-03-10-pypy

Also note that the official recommendation for using pip with pypy is described here, the key point of which is this:

Best practices with pip is to always call it as -mpip ..., but if you wish to be able to call pip directly from the command line, you must call pypy -mensurepip --default-pip.