Python

def flatten(t):
    return [item for sublist in t for item in sublist]

>>> import itertools
>>> list2d = [[1,2,3], [4,5,6], [7], [8,9]]
>>> merged = list(itertools.chain(*list2d))

merged = list(itertools.chain.from_iterable(list2d))

# Given a list of lists l,
flat_list = [item for sublist in l for item in sublist]

>>> import itertools
>>> list2d = [[1,2,3], [4,5,6], [7], [8,9]]
>>> merged = list(itertools.chain.from_iterable(list2d))

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