virtualenv and VIRTUAL_ENV keyword

Question

After having installed a new virtualenv, for example called ENV, if I type

. /path/to/ENV/bin/activate python import os print os.environ['VIRTUAL_ENV']

Then I see the /path/to/ENV/

However, if I type

/path/to/ENV/bin/python

And then

import os print os.environ['VIRTUAL_ENV']

I've got a key error So what is the fundamental difference between these two methods? Thanks,

girasquid · Accepted Answer · 2013-02-06 16:10:21Z

Inside the script at bin/activate, there's a line that looks like this:

VIRTUAL_ENV="/Users/me/.envs/myenv" export VIRTUAL_ENV

Which is what's responsible for setting your VIRTUAL_ENV environment variable. When you don't use activate, that variable never gets exported - so it's not present in os.environ.

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