# collections.Counter lets you find the most common# elements in an iterable:>>> importcollections>>> c = collections.Counter('helloworld')

>>> c
Counter({'l': 3, 'o': 2, 'e': 1, 'd': 1, 'h': 1, 'r': 1, 'w': 1})>>> c.most_common(3)
[('l', 3), ('o', 2), ('e', 1)]