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  • definitely the best as OP is using numpy Commented Nov 13, 2014 at 17:29
  • x.reshape(-1) is another way of producing the 1d array. Tack on .tolist() to make it a list. Commented Nov 13, 2014 at 19:29
  • An interesting point is that flatten returns a copy, ravel (and reshape) only does so if necessary. In some cases that matters. Commented Nov 14, 2014 at 0:19