Typing: Compatibility

Since typing still significantly changes across different Python versions, all the special cases are handled here.

tad_mctc.typing.compat.CacheKey

alias of tuple[int, str, tuple[Any, …], frozenset[tuple[str, Any]]]

class tad_mctc.typing.compat.Sequence

All the operations on a read-only sequence.

Concrete subclasses must override __new__ or __init__, __getitem__, and __len__.

count(value) → integer -- return number of occurrences of value

index(value[, start[, stop]]) → integer -- return first index of value.

Raises ValueError if the value is not present.

Supporting start and stop arguments is optional, but recommended.

tad_mctc.typing.compat.override(arg, /)

Indicate that a method is intended to override a method in a base class.

Usage:

class Base:

def method(self) -> None:

pass

class Child(Base):

@override def method(self) -> None:

super().method()

When this decorator is applied to a method, the type checker will validate that it overrides a method with the same name on a base class. This helps prevent bugs that may occur when a base class is changed without an equivalent change to a child class.

There is no runtime checking of these properties. The decorator sets the __override__ attribute to True on the decorated object to allow runtime introspection.

See PEP 698 for details.