plz write in python 3

The module midterm contains a function complexity, which accepts a string as input, and returns an average measure of the scarcity of the letters used within the string. Eor example, complexity('treat') returns 1.388278229015375, since the letters used in that word are all very common. complexity('pizza') however, returns 13.650743077691248, due to the double 'z'. Nrite a function weirdest_word which accepts a list of strings, and returns the string contained in the list that maximises the ralue of the function complexity. You may assume that each input list will contain a unique string that maximises complexity)