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It’s up to the tool consuming the annotations to decide whether theĬlient is allowed to have several annotations on one type and how to Unknown annotation it should just ignore it and treat annotated type as When a tool or a library does not support annotations or encounters an A tool or library encountering an Annotated typeĬan scan through the annotations to determine if they are of interest Ultimately, the responsibility of how to interpret the annotations (ifĪt all) is the responsibility of the tool or library encountering theĪnnotated type. Together with runtime access to x within a specific application. Of T (e.g., via mypy or Pyre, which can safely ignore x) Or a class, the Annotated type allows for both static typechecking Module which completely disables typechecking annotations on a function No_type_check functionality that currently exists in the typing Should ignore it and simply treat the type as T. If a library (or tool) encounters a typehintĪnnotated and has no special logic for metadata x, it This metadata can be used for either staticĪnalysis or at runtime. Specifically, a type T can be annotated with metadata x via the (possibly multiple pieces of it, as Annotated is variadic). Take the form Callable andĬallable, ReturnType]Ī type, introduced in PEP 593 ( Flexible function and variable annotations), to decorate existing types with context-specific metadata Parameter types are dependent on each other using ParamSpec.Īdditionally, if that callable adds or removes arguments from otherĬallables, the Concatenate operator may be used. A plain Callable is equivalent toĬallables which take other callables as arguments may indicate that their Type hint a callable taking any number of arguments and returning Such function types are rarely used as callback types.Ĭallable (literal ellipsis) can be used to There is no syntax to indicate optional or keyword arguments Must be a list of types or an ellipsis the return type must be Values: the argument list and the return type. The subscription syntax must always be used with exactly two Callable ¶Ĭallable type Callable, str] is a function of (int) -> str. PEP 612: Parameter Specification VariablesĬhanged in version 3.10: Optional can now be written as X | None.Introducing types.UnionType and the ability to use PEP 604: Allow writing union types as X | Y.PEP 593: Flexible function and variable annotations.PEP 591: Adding a final qualifier to typing.PEP 589: TypedDict: Type Hints for Dictionaries with a Fixed Set of Keys.Introducing types.GenericAlias and the ability to use standard
PEP 585: Type Hinting Generics In Standard Collections.PEP 544: Protocols: Structural subtyping (static duck typing).Introducing syntax for annotating variables outside of function PEP 526: Syntax for Variable Annotations.Number of PEPs have modified and enhanced Python’s framework for type Since the initial introduction of type hints in PEP 484 and PEP 483, a
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