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Python typing Module

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Example

Use type hints in function definitions:

from typing import List

def greet(names: List[str]) -> str:
return f"Hello {', '.join(names)}"

result = greet(['Emil', 'Linus'])
print(result)

Try it Yourself »

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Definition and Usage

The typing module provides support for type hints in Python code.

Use it to add type annotations for better code documentation, IDE support, and static type checking with tools like mypy.

Members

Member	Description
Annotated	Add metadata to type hints.
Any	Type that allows any value.
Callable	Type for callable objects (functions, methods).
cast()	Cast a value to a specific type (for type checkers).
ClassVar	Mark class variables that should not be set on instances.
Dict	Generic type for dictionaries.
Final	Mark a variable as final (should not be reassigned).
Generic	Base class for user-defined generic types.
get_type_hints()	Return type hints for a function or method.
List	Generic type for lists.
Literal	Type for literal values.
Optional	Type that can be a specific type or None.
Protocol	Base class for protocol classes (structural subtyping).
Set	Generic type for sets.
Tuple	Generic type for tuples.
TypedDict	Define dictionary types with specific required keys.
TypeVar	Create type variables for generic types.
Union	Type that can be one of several types.

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