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Python · Function

issubclass

issubclass() tests whether one class is a subclass of another. It can also test against several classes supplied in a tuple or union type.

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Syntax

issubclass(cls, classinfo, /)

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  • isinstance()
  • type()
  • super()

Source: Built-in Functions — Python 3.15.2 documentation. Checked 2026-11-03.