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feat: add an example return type to the Concatenate solution #133

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feat: add an example return type to the Concatenate solution #133

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11 changes: 9 additions & 2 deletions challenges/extreme-concatenate/solution.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,14 +8,21 @@
to transform `foo` into the function you want.
"""

from typing import Concatenate, Callable, Any
from typing import Concatenate, Callable, Any, Protocol


class Person:
pass


def transform[T, **P](f: Callable[Concatenate[Any, P], T]):
# Not required to pass the tests
class Transformed[T, **P](Protocol):
def __call__(self, value: Person, *args: P.args, **kwargs: P.kwargs) -> T:
...


# Omitting the return type still passes tests
def transform[T, **P](f: Callable[Concatenate[Any, P], T]) -> Transformed[T, P]:
def wrapper(value: Person, *args: P.args, **kwargs: P.kwargs) -> T:
return f(value, *args, **kwargs)

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