Function to determine list max without itertools

[Sayth Renshaw]

I have created a function that takes a list as an argument.
Without using itertools I want to compare each item in the list to find the max.

However instead of the max I keep getting the  last item in the list. Where is 
my logic wrong here?

def maximum(listarg):
    items = list(listarg)
    myMax = 0
    for index, item in enumerate(items):
        for otheritem in items[index + 1 :]:
            if item < otheritem:
                myMax = otheritem
            elif item > otheritem:
                myMax = item
            else:
                myMax = myMax

Seems like it should work but doesn't.

Cheers

Sayth
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