Python useless counter class

Counter.py

class Counter(object):
    """ This class counts stuff... """
    def __init__(self, start = 0, end = 10, increment = 1):
        self.start = start
        self.end = end
        self.increment = increment

    def __iter__(self):
        # this method is called when a Counter object is used as an iterator (e.g. in a for loop).
        i = self.start
        while i < self.end:
            yield i
            i += self.increment

    def __reversed__(self):
        i = self.end    
        while i > self.start:
            i -= self.increment
            yield i
    def __str__(self):
        return str(map(str,self))

#instantiate a new Counter object, counting even numbers only
c = Counter(start = 0, end = 20, increment = 2)

print("As string")
print c

print("Forward iterator, comma separated")
#map each value from c into the str function to get a list of printable strings.
print ",".join(map(str,c))

print("Backward")
#reversed(c) gets an iterator from Counter.__reversed__ instead of Counter.__iter__
print map(str,reversed(c))

print("Loop")
for x in c:
    print x

print("List comprehension of numbers divisible by 3")
print([x for x in c if x % 3 == 0 ])