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Copy pathfunctions.py
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29 lines (19 loc) · 748 Bytes
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from typing import Optional, TypeVar, overload
T = TypeVar("T")
@overload
def coalesce(value: Optional[T], fallback: T) -> T: ...
@overload
def coalesce(value: Optional[T], *values: Optional[T]) -> Optional[T]: ...
@overload
def coalesce(value: Optional[T], *values: Optional[T], fallback: T) -> T: ...
def coalesce(value: Optional[T], *values: Optional[T], fallback: Optional[T] = None) -> Optional[T]:
"""
Returns the first value that is not `None`. If a not-None fallback is specified, the function is guaranteed
to return a not-Non value.
"""
if value is not None:
return value
value = next((x for x in values if x is not None), None)
if value is not None:
return value
return fallback