def powers_of_two(max_power) :
    """print powers of two up to max_power in table form"""
    x = 1
    while x <= max_power :
        print x, '\t', 2**x
        x += 1

def powers_of_two_2(max_power) :
    """print powers of two up to max_power in table form with
    a for loop"""

    for i in range(max_power + 1) :
        print x, '\t', 2**x