my_range

def my_range(*args):
    li = []
    if len(args)>3 or len(args)<1:
        raise ValueError
    if len(args)==1:
        k=1.0
        a=0.0
        while a<=args[0]:
            li.append(a)
            a+=k
    elif len(args)==2:
        k=1.0
        a=args[0]
        while a<=args[1]:
            li.append(a)
            a+=k
    elif len(args)==3:
        a = args[0]
        k = args[2]
        if args[2]==0.0: raise ValueError
        elif args[2]>0:
            while a <= args[1]:
                li.append(a)
                a += k
        else:
            while a >= args[1]:
                li.append(a)
                a += k
    return li

def main():
    try:
        print my_range(1.1, 2.2, 0.5)
        print my_range(1.1, 2.2)
        print my_range(2.2)
        print my_range()
    except:
        print "Zla wartosc"

if __name__=='__main__':
    main()