from utils.literal import Literal

# a generator that yields items instead of returning a list
def mrange(parm1, parm2=None, parm3=None):
    if parm2 is None:
        start = 0
        stop = int(parm1)
        step = 1
    elif parm3 is None:
        start = int(parm1)
        stop = int(parm2)
        step = 1
    else:
        start = int(parm1)
        stop = int(parm2)
        step = int(parm3)
    num = start
    if step > 0:
        while num < stop:
            yield Literal(num)
            num += step
    else:
        while num > stop:
            yield Literal(num)
            num += step

if __name__ == "__main__":
    for l in mrange(10):
        print(l)