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zackmdavis/gist:65d5d8d8c4fd4638e2e20eab1615a1d2

Created March 14, 2018 22:09
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gistfile1.txt
from typing import Optional, TypeVar
T = TypeVar('T')
U = TypeVar('U')
def option_map(arg: Optional[T], fn: Callable[[T], U]) -> Optional[U]:
if arg is not None:
return fn(arg)
else:
return None
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