Subclass in type hinting

by

When you specify cls: A, you’re saying that cls expects an instance of type A. The type hint to specify cls as a class object for the type A (or its subtypes) uses typing.Type.

from typing import Type
def process_any_subclass_type_of_A(cls: Type[A]):
    pass

From The type of class objects
:

Sometimes you want to talk about class objects that inherit from a
given class. This can be spelled as Type[C] where C is a class. In
other words, when C is the name of a class, using C to annotate an
argument declares that the argument is an instance of C (or of a
subclass of C), but using Type[C] as an argument annotation declares
that the argument is a class object deriving from C (or C itself).

More Related Contents:

  1. Type hinting a collection of a specified type
  2. Using the class as a type hint for arguments in its methods [duplicate]
  3. How to use type hints in python 3.6?
  4. Type annotations for *args and **kwargs
  5. How can I tell PyCharm what type a parameter is expected to be?
  6. How should I use the Optional type hint?
  7. How do I add default parameters to functions when using type hinting?
  8. What’s the difference between a constrained TypeVar and a Union?
  9. typing: Dynamically Create Literal Alias from List of Valid Values
  10. Exclude type in Python typing annotation
  11. Can you annotate return type when value is instance of cls?
  12. Python type hinting with exceptions
  13. Python 3 dictionary with known keys typing
  14. Defining a recursive type hint in Python?
  15. Can I omit Optional if I set default to None?
  16. Type hinting in Python 2
  17. Type hints with user defined classes
  18. Using List/Tuple/etc. from typing vs directly referring type as list/tuple/etc
  19. How do I annotate types in a for-loop?
  20. mypy, type hint: Union[float, int] -> is there a Number type?
  21. Name not defined in type annotation [duplicate]
  22. Python 3.5 type hinting does not result in an error
  23. Type hints in namedtuple
  24. How to annotate function that takes a tuple of variable length? (variadic tuple type annotation)
  25. typing.Any vs object?
  26. Python typing for module type
  27. Recursive Typing in Python 3.5+ [duplicate]
  28. How to type hint a dictionary with values of different types
  29. What is the type hint for a (any) python module?
  30. How to annotate a type that’s a class object (instead of a class instance)?

Leave a Comment