writing numbers to csv file

[perfringo]

For SchroedingersLion sake I add one additional tidbit to consider when comparing those two solutions:

Actually option2 can be simplified even further

data = zip(x2, y2)
result_writer.writerows(data)

or even as one-liner

result_writer.writerows(zip(x2, y2))

zip() produces iterator and you can consume it only once. Depending on your needs and in order to avoid nasty surprises you should be aware of following (expected) behaviour:

>>> x = [1, 2, 3]
>>> y = [4, 5, 6]
>>> zipped = zip(x, y)       # iterator created
>>> list(zipped)             # iterator consumed
[(1, 4), (2, 5), (3, 6)]
>>> list(zipped)             # exhausted iterator           
[]
>>> list(zip(x, y))          # iterator created and consumed
[(1, 4), (2, 5), (3, 6)]
>>> list(zip(x, y))          # iterator created again and consumed
[(1, 4), (2, 5), (3, 6)]