Someone

def whereis(s1,s2):    '''whereis(str, str)-> int/boolean        Returns the index number of the first occurence of the single letter     string s2 in the string s1. Returns False if the parameters given are not     strings'''    if ( type(s1) != str ) or ( type(s2) != str ):        return False        if len(s2) != 1:        return False        return s1.find(s2)