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Brendan Whiting
Front End Web Development Techdegree Graduate 84,738 Pointslibraries do not appear in console as they do in video
On the video at 1:15 she types in:
pip list | grep "matplotlib*\|numpy*"
And the libraries and versions appear in the console. I think I did the same but nothing appears. I'm using the same workspace, and if I try "pip install" for each library, it says requirement already satisfied, so things can't be that wrong, I'm just curious why this pip list command isn't working for me.
1 Answer
Chris Freeman
Treehouse Moderator 68,454 Pointspip responds to shell environment variables that set the default value of options. Grepping for PIP variables:
$ env | grep PIP
PIP_USER=true
With PIP_USER set, all pip commands run as if the --user option is set (see docs). This means pip list will only show the modules installed by the user and not system installed modules. Hence, an empty list is returned.
To override this environment variable use the --isolated option (see docs). Running this will produce what you seek:
treehouse:~/workspace$ pip --isolated list | grep "matplotlib*\|numpy*"
matplotlib (1.4.2)
numpy (1.9.1)
Thanks for this question! I learned about pip environment variables in the process!
Brendan Whiting
Front End Web Development Techdegree Graduate 84,738 PointsBrendan Whiting
Front End Web Development Techdegree Graduate 84,738 PointsThank you!!