Convert typing to use Standard types where possible.

[Christian-B]

See: https://peps.python.org/pep-0585/

Starting with python 3.9 where applicable Standard classes

So instead of doing List[int] we can type as list[int]

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As readthedocs is able to use type hint in the def to document param types we will remove ALL tying from the method documentation.

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While doing this I will apply the rule at all (OK almost all) methods must be typed.

Exception will be (I reserve the right to add to this list)

• Deep generic methods like AbstractBase.new

• spinn_utilities/citation as I am not civinced we want to keep this code

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All public methods must be documented

A protected (single underscore) should be documented.

Private need not be documented.

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WILL not work with Python 3.8!

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Features only available in Python 3.10 will not be used so we will keep

• from typing_extensions import TypeAlias

[Christian-B]

tests only need typing enough to pass

[Christian-B]

mypy is smart enough to know list[str] and list[str] are the same

so mixing then especially why developing this chain of prs is not a problem.

[Christian-B]

Speed testing between the various way to handle use of Optional values a: Optional[int] = 1 b = 0

Over 10,000,000 iterations

b+= a  

0.72 but will fail mypy

assert a is not None
b+= a

0.86

b+= cast(int, a)

1.34

assert isinstance(a, int)
b+= a

1.50

[Christian-B]

Therefor where mypy can not distinguish between None or an Object pick assert None but where mypy can not distinguish between type A or B use cast,

Remember of course incorrect cast will not save you at runtime! Assert will unless turned off