def list_div_by_7_but_not_5(start=2000, stop=3200):
    """
    Question1: 
    all numbers divisible by 7 but not by 5 from selected range
    """

    return ','.join([ str(value) for value in range(start,stop+1) \
            if value%7 == 0 and value%5 != 0 ])