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import itertools
a = [['a','b'], ['c']]
print(list(itertools.chain.from_iterable(a)))
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x = [["a","b"], ["c"]]
result = sum(x, [])
# This combines the lists within the list into a single list
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sum([[1, 2, 3], [4, 5, 6], [7], [8, 9]],[])
# [1, 2, 3, 4, 5, 6, 7, 8, 9]
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StringName = "seperator".join(ListName)
# Seperator denotes character between each of the joined list elements