How to get every nth column in pandas with an specific last nth column?

Question

Using the function row[3::2] will return the row from every 2nd column starting from the 3rd column.

But how can you adjust it so it returns up to a certain column? That is, how can you adjust it so it only gets every 2nd column up to the nth column.

To go from 3 to n taking every other item would be row[3:n:2]. To take n items starting at 3 and taking every other would be something more like row[3::2][:n]. In that case it would probably make more sense to use something like itertools.islice — Patrick Haugh
– Patrick Haugh, Commented Feb 8, 2018 at 0:56

jpp · Accepted Answer · 2018-10-23 22:56:07Z

1

Slicing syntax is start: stop: step, so to return only up to a certain column you can use:

row[3:10:2]

It's also possible to chain indexers like this:

row[3:10][::2]

answered Feb 8, 2018 at 0:55

jpp

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