"Nested" virtual environments

[Luca Cerone]

Thanks Marcel,
I will give it a try during the weekend and let you know if it worked for me :)
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> If you have a recent version of pip, you can use wheels [1] to save built packages locally. First create a new virtualenv and install the common packages. Then put these packages in a wheel directory. Then, for any other virtualenv that need the common packages, you can easily install then from the wheel directory (this is fast even for numpy & friends, because nothing will be compiled again) [2].
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> # Create a new virtualenv
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> virtualenv myenv
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> source myenv/bin/activate
> # Install the wheel package
> pip install wheel
> # Install your common packages
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> pip install numpy scipy matplotlib
> # Create a requirements file
> pip freeze > /local/requirements.txt
> # Create wheel for the common packages
> pip wheel --wheel-dir=/local/wheels -r /local/requirements.txt
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> Now you have all the built packages saved to /local/wheels, ready to install on any other environment. You can safely delete myenv. Test it with the following:
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> # Create a virtualenv for a new project
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> virtualenv myproj
> source myproj/bin/activate
> # Install common packages from wheel
> pip install --use-wheel --no-index --find-links=/local/wheels -r /local/requirements.txt
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> [1] https://wheel.readthedocs.org
> [2] http://www.pip-installer.org/en/latest/cookbook.html#building-and-installing-wheels
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> 2013/8/9 Luca Cerone <luca.... at gmail.com>
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> Dear all, is there a way to "nest" virtual environments?
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> I work on several different projects that involve Python programming.
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> For a lot of this projects I have to use the same packages (e.g. numpy, scipy, matplotlib and so on), while having to install packages that are specific
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> for each project.
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> For each of this project I created a virtual environment (using virtualenv --no-site-packages) and I had to reinstall the shared packages in each of them.
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> I was wondering if there is a way to nest a virtual environment into another,
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> so that I can create a "common" virtual environment  that contains all the
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> shared packages and then "specialize" the virtual environments installing the packages specific for each project.
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> In a way this is not conceptually different to using virtualenv --system-site-packages, just instead of getting access to the system packages a virtual environment should be able to access the packages of an other one.
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> Thanks a lot in advance for the help,
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> Luca
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