How to break sublist to make each element in the sub list a normal element in the list in python -

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for example have

[[1,2,3],[1,2,3],3,5,6]

i want turn 

[1,2,3,1,2,3,3,5,6]

what code in python 3?

iterate a items, iterate subitems if item list; other append new list:

a = [[1,2,3],[1,2,3],3,5,6] b = [] x in a:     if isinstance(x, list):         b.extend(x)     else:         b.append(x) # b == [1,2,3,1,2,3,3,5,6]

another approach using list comprehension (nested for) combined conditional expression:

>>> = [[1,2,3],[1,2,3],3,5,6] >>> [y x in y in (x if isinstance(x, list) else [x])] [1, 2, 3, 1, 2, 3, 3, 5, 6]

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