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Missing python modules

Issue description

Python modules cannot be found, usually a ImportError no module named X

First folder

Debug Case 01 (missing global packages)

  • Start python in REPL mode (just type in python in the command line to enter python terminal)

  • Try importing the module there. import flask for example.

  • If you get the same ImportError the module is not installed, therefore your application cannot use it

Solution Case 01

  • Install the missing modules with sudo and pip. sudo pip install flask for example.

Debug Case 02 (missing virtualenv packages)

  • Go to your project folder. (usually /var/www/somename/somename)

  • Activate the virtualenv there. (usually source ./venv/bin/activate)

  • Make sure there is a (venv) string at the start of the line

Solution Case 02

  • Install the missing modules with virtualenv activated and pip. pip install flask for example.

Debug Case 03 (venv packages lacking of permission)

  • If you are doing the REPL test mentioned above, the package is being importd but the application still cannot read them, so you may need to check permissions

  • Make sure you have that your .conf (usually /etc/apache2/sites-available/something.conf) has the WSGIDaemonProcess property properly configured and pointing to your virtualenv

  • Make sure the virtualenv folder has the correct ownership (grader:grader). You can use the chown command to change this if needed

  • Make sure the virtualenv folder has the correct read/write permissions (drwxr-xr-x). You can use the chmod command to change this if needed

Case 03 documentation/references