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Thu Jan 8 04:08:56 EST 2004 · https://mail.python.org/pipermail/python-dev/2004-January/041800.html

Hello All,

Do you think there is a place for an "argmax" function (which I use a lot)
in the standard library?

I'm thinking in the lines of:

def argmax(items, func, cmp=cmp):
    '''argmax(items, func) -> max_item, max_value'''
    it = iter(items)
    # Initial values
    try:
        item = it.next()
    except StopIteration:
        raise ValueError("can't run over empty sequence")
    val = func(item)

    for i in it:
        v = func(i)
        if cmp(v, val) == 1:
            item = i
            val = v
    return item, val

def argmin(items, func, cmp=cmp):
    '''argmin(items, func) -> min_item, min_value'''
    return argmax(items, func, lambda x,y : -cmp(x,y))

Thanks.
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[Python-Dev] argmax?