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Description
Improved documentation by suggesting to set the python path if an import error occurs.
Motivation and Context
Since this documentation is part of introductory material, it is probably a good idea to suggest this common mistake. The error this addresses has also been mentioned in a previous issue (#1321).
Have you tested this? If so, how?
Added example command to work around the class missing from PYTHONPATH issue which causes an import error when calling the luigi command line tool.