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How can I document my custom Python functions in QGIS?

I would like to offer users help for functions I wrote for them:

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I've tried adding a docstring:

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But whenever I click Load an error message is displayed:

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The error message clearly shows an indentation error, which does not correspond to my actual code.

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What you are doing is the correct way to document your custom function.
The error you are encountering is because by default when you write a function in the Function Editor, the indentation before the return statement is that of 4 spaces characters and not 'tab space'. Just check if that is the case. The indentation should be consistent (either only spaces or tab space).

  • @ nash is right. I just tested the function and there's an error only when using a tab space instead of 4 spaces. +1, good answer! – mgri Mar 21 '17 at 18:32
  • Good thinking! This means that the error message is correct as well. It is strange that sometimes, but not always, when you hit Enter QGIS uses a tab instead of space characters, meaning that QGIS adds an error by default. Although I cannot figure out when exactly it doesn’t do it correctly. – BritishSteel Mar 28 '17 at 10:44

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