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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,
668
Activate the virtual environment Activation makes the virtual environment the default Python interpreter for the duration of a shell session. You'll need to use different syntax for activating the virtual environment depending on which operating system and command shell you're using.
Check the $VIRTUAL_ENV environment variable. The $VIRTUAL_ENV environment variable contains the virtual environment's directory when in an active virtual environment. Once you run deactivate / leave the virtual environment, the $VIRTUAL_ENV variable will be cleared/empty.
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.
92
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