[python] PyLint "Unable to import" error - how to set PYTHONPATH?

In case anybody is looking for a way to run pylint as an external tool in PyCharm and have it work with their virtual environments (why I came to this question), here's how I solved it:

  1. In PyCharm > Preferences > Tools > External Tools, Add or Edit an item for pylint.
  2. In the Tool Settings of the Edit Tool dialog, set Program to use pylint from the python interpreter directory: $PyInterpreterDirectory$/pylint
  3. Set your other parameters in the Parameters field, like: --rcfile=$ProjectFileDir$/pylintrc -r n $FileDir$
  4. Set your working directory to $FileDir$

Now using pylint as an external tool will run pylint on whatever directory you have selected using a common config file and use whatever interpreter is configured for your project (which presumably is your virtualenv interpreter).

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