itertools - implementing argmax in Python -

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how should argmax implemented in python? should efficient possible, should work iterables.

three ways implemented:

  • given iterable of pairs return key corresponding greatest value
  • given iterable of values return index of greatest value
  • given iterable of keys , function f, return key largest f(key)

i modified best solution found:

# given iterable of pairs return key corresponding greatest value def argmax(pairs):     return max(pairs, key=lambda x: x[1])[0]  # given iterable of values return index of greatest value def argmax_index(values):     return argmax(enumerate(values))  # given iterable of keys , function f, return key largest f(key) def argmax_f(keys, f):     return max(keys, key=f)

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