''' Purpose: better experience functional development
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    Who checked your code: 
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'''
import math

def inverse( n ) :
    ''' Returns the additive inverse of numeric parameter n. The additive inverse
        of n is -n.
    '''

    ...

    return result


def longer( s, t ) :
    ''' Returns the longer of string parameters s and t. If s and t have the same
        length, then s is returned
    '''

    ...

    return result

def summation( n ) :
    ''' For integer parameter n, returns the sum of 0 + 1 + ... + n.
    '''

    ...

    return result