How to flatten a list of tuples into a pythonic list

>>> INPUT = [(1,2),(1,),(1,2,3)]
>>> import itertools
>>> list(itertools.chain.from_iterable(INPUT))
[1, 2, 1, 1, 2, 3]

You could use a list comprehension:

>>> INPUT = [(1,2),(1,),(1,2,3)]
>>> [y for x in INPUT for y in x]
[1, 2, 1, 1, 2, 3]
>>>

itertools.chain.from_iterable is also used a lot in cases like this:

>>> from itertools import chain
>>> INPUT = [(1,2),(1,),(1,2,3)]
>>> list(chain.from_iterable(INPUT))
[1, 2, 1, 1, 2, 3]
>>>

That's not exactly a one-liner though.

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