Monads/List monad: Difference between revisions
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=={{header|Python}}== |
=={{header|Python}}== |
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<syntaxhighlight lang="python"> |
<syntaxhighlight lang="python"> |
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"""A List Monad. Requires Python >= 3.7 for type hints.""" |
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from __future__ import annotations |
from __future__ import annotations |
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from itertools import chain |
from itertools import chain |
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from typing import Any |
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from typing import Callable |
from typing import Callable |
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from typing import Iterable |
from typing import Iterable |
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T = TypeVar("T") |
T = TypeVar("T") |
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U = TypeVar("U") |
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return cls(value) |
return cls(value) |
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def bind(self, func: Callable[[T], MList[ |
def bind(self, func: Callable[[T], MList[U]]) -> MList[U]: |
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return MList(chain.from_iterable(map(func, self))) |
return MList(chain.from_iterable(map(func, self))) |
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def __rshift__(self, func: Callable[[T], MList[ |
def __rshift__(self, func: Callable[[T], MList[U]]) -> MList[U]: |
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return self.bind(func) |
return self.bind(func) |
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if __name__ == "__main__": |
if __name__ == "__main__": |
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# Chained int and string functions |
# Chained int and string functions. |
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print( |
print( |
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MList([1, 99, 4]) |
MList([1, 99, 4]) |
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) |
) |
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# Cartesian product of [1..5] and [6..10] |
# Cartesian product of [1..5] and [6..10]. |
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print( |
print( |
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MList(range(1, 6)).bind( |
MList(range(1, 6)).bind( |
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) |
) |
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# Pythagorean triples with elements between 1 and 25 |
# Pythagorean triples with elements between 1 and 25. |
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print( |
print( |
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MList(range(1, 26)).bind( |
MList(range(1, 26)).bind( |
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