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Pydantic · Class

InstanceOf

InstanceOf[T] makes Pydantic require a value to be an instance of class T. Values that fail the instance check produce a validation error.

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Syntax

InstanceOf[T]

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  • SkipValidation
  • ValidateAs
  • field_validator

Source: Functional Validators | Pydantic Docs. Checked 2026-11-03.