Web Reference: May 13, 2021 · PEP 634, available since Python 3.10, specifies that isinstance () checks are performed with class patterns. To check for an instance of str, write case str(): .... Note that the parentheses are essential. That is how the grammar determines that this is a class pattern. The built-in isinstance() function checks if an object is an instance of a specified class or a subclass thereof, returning a Boolean value. It’s a versatile tool for explicit type checking in Python, as it considers subclass relationships: Jul 11, 2025 · The following table highlights the differences between the isinstance () and type () methods, both used for type checking. Knowing when to use each helps write more efficient and reliable code.
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