Robert Kern wrote:
O(n). Python lists are contiguous arrays in memory, and everything after the insertion point needs to be moved. Raymond Hettinger has a good talk about the implementation of Python lists and other container objects.

http://www.youtube.com/watch?v=hYUsssClE94
http://www.pycon.it/static/stuff/slides/core-python-containers-under-hood.ppt
Thanks. :)

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