join list of lists in python [duplicate]

python

import itertoolsa = [['a','b'], ['c']]print(list(itertools.chain.from_iterable(a)))

python

x = [["a","b"], ["c"]]result = sum(x, [])

python

If you're only going one level deep, a nested comprehension will also work:

>>> x = [["a","b"], ["c"]]>>> [inner...     for outer in x...         for inner in outer]['a', 'b', 'c']

On one line, that becomes:

>>> [j for i in x for j in i]['a', 'b', 'c']

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