converting a list of integers into range in python

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Using itertools.groupby() produces a concise but tricky implementation:

import itertools

def ranges(i):
    for a, b in itertools.groupby(enumerate(i), lambda pair: pair[1] - pair[0]):
        b = list(b)
        yield b[0][1], b[-1][1]

print(list(ranges([0, 1, 2, 3, 4, 7, 8, 9, 11])))

Output:

[(0, 4), (7, 9), (11, 11)]

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