I'd like to propose adding argmax and argmin functions to the python list.
These functions return the index of a maximum / minimum element of the
list. Eg:

a = [1, 4, 2, 3]
print(a.argmax())  # 1
print(a.argmin())  # 0

It's a very popular request (based on stackoverflow
https://stackoverflow.com/questions/16945518/finding-the-index-of-the-value-which-is-the-min-or-max-in-python
), and currently there is no elegant way to find it.

What do you think?
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