Thursday, September 22, 2016

Flask on Windows and the case of the Pip install failing

At work I have a Mac and back home I have a Linux (Fedora) and Windows 10 machines. I started a Flask project on the Mac and then put it in a Github repo which I then cloned on my Windows 10 machine. And this is where I encountered the problem of pip failing to install the modules. I tried two variations to the call:
  1. > pip install -r requirements.txt
  2. > python -m pip install -r requirements.txt
This is with Python 3 and both will spit out a "Permission Denied" error relating to your appdata/Temp folder. The contents of my requirements.txt is pretty tame.

Here's a partial.


It fails right on the get module. It say something like it can access the temp folder on your Windows machine which put me on a wild goose chase because the error isn't fucking related to permissions. I figured out the fix after watching the temp folder while pip attempted to install the modules.

Apparently, the Windows pip version does something really weird with the and/or egginfo where it attempts a build on a empty setup folder for the get module causing the error. The fix is to just change the version. In this case for get==0.0.0 to get==0.0.20.

The pip install command should go off with no problems now.