Python - find incremental numbered sequences with a list comprehension [duplicate]

Answer 1

Pythonic means simple, straightforward code, and not one-liners.

def runs(seq):
    result = []
    for s in seq:
        if not result or s != result[-1][-1] + 1:
            # Start a new run if we can't continue the previous one.
            result.append([])
        result[-1].append(s)
    return result

print runs([1, 2, 3, 4, 8, 10, 11, 12, 17])