Make virtualenv inherit specific packages from your global site-packages

Question

I m looking for a way to make a virtualenv which will contain just some libraries  which i chose  of the base python installation   To be more concrete  I m trying to import my matplotlib to virtualenv during the creation of virtualenv  It can t be installed efficiently with pip or easy install since it misses some fortran compiler libs  The way i did it till now was to manually copy from   usr lib python2 7 dist-packages  to virtualenv name lib python2 7 dist-packages    however this prevents the manully imported links to be registerd by yolk  which prints all currently available libs in virtualenv    So  is there a way to do a selective variant of the  virtualenv --system-site-packages

User · Answer

You can use virtualenv --clear  which won t install any packages  then install the ones you want

User · Answer

You can use the --system-site-packages and then  overinstall  the specific stuff for your virtualenv  That way  everything you install into your virtualenv will be taken from there  otherwise it will be taken from your system

User · Answer

Install virtual env with  virtualenv --system-site-packages   and use pip install -U to install matplotlib

User · Answer

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

[python] Make virtualenv inherit specific packages from your global site-packages

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