Install from conda_spec.txt with:

conda install --file conda_spec.txt

Then install from requirements.txt with:

conda install --file requirements.txt pip install -r requirements.txt

This searches first from conda and pip covers the ones that are not found in conda.

When making changes:

First try to conda install new packages, then if not found use pip.

Then update conda_spec.txt with:

conda list --explicit > conda_spec.txt

pip freeze > requirements.txt