How to use 'functools reduce' in Python

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19def reduce(
20 self, f: Callable[[B, A], B], initializer: Optional[B] = None
21) -> B:
22 """
23 Aggregate elements by ``f``
25 Example:
26 >>> List(range(3)).reduce(lambda a, b: a + b)
27 3
29 Args:
30 f: Function to perform aggregation
31 initializer: Starting value for aggregation
32 Return:
33 Aggregated result
34 """
35 return reduce(f, self, initializer) # type: ignore

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