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Editorial Team
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Asked: 2026-05-29T04:27:59+00:00

I recently picked up PyCharm and I’m used to a feature from Wing where

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I recently picked up PyCharm and I’m used to a feature from Wing where you can tell the IDE what class a particular identifier (variable, attribute, whatever) will be. For example:

my_object = SomeClass()
assert isinstance(my_object.my_attribute, SomeOtherClass)

At this point, Wing knows exactly what my_object.my_attribute is even if it couldn’t otherwise figure it out from source code analysis.

I’m looking for a similar feature in PyCharm. I know what a particular attribute of an object is, but PyCharm doesn’t, so how can I tell it, so it can give me handy completions?

Related question: I also do see a similar question, How can I tell PyCharm what type a parameter is expected to be?, but it doesn’t cover attributes, just parameters.

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1 Answer

  1. Editorial Team

    Actually PyCharm also understands the ‘assert isinstance’ syntax, but only for unqualified references. I’ve filed an issue to support this for qualified references as well:

    http://youtrack.jetbrains.net/issue/PY-5614

    In the current version, you can specify the type of my_attribute by going to the declaration of SomeClass and adding a epydoc or sphinx docstring for the attribute.

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