Make virtualenv inherit specific packages from your global site-packages

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Create the environment with virtualenv --system-site-packages . Then, activate the virtualenv and when you want things installed in the virtualenv rather than the system python, use pip install --ignore-installed or pip install -I . That way pip will install what you’ve requested locally even though a system-wide version exists. Your python interpreter will look first in the virtualenv’s package directory, so those packages should shadow the global ones.

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