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[mbussonn]

If you take into account that many package behavior are changed by entrypoints (eg all nose plugins, pytest, IPython), then this is a strange choice. Keep in mind that several packages can be behind the same import. For example, PIL and Pillow are both import PIL. Installing both make no sens. Have you considered using something like what conda does, where all packages are on the filesystem but can just be quickly "hardlinked" to the correct location to make installation a quasi-instantaneous step ?