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find_index python Code Snippet in 2022

listintermediate

Last Updated: 28 December 2022

Finds the index of the first element in the given list that satisfies the provided testing function.

  • Use a list comprehension, enumerate() and next() to return the index of the first element in lst for which fn returns True.
def find_index(lst, fn): return next(i for i, x in enumerate(lst) if fn(x))
find_index([1, 2, 3, 4], lambda n: n % 2 == 1) # 0

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