What is :: (double colon) in Python when subscripting sequences? What is :: (double colon) in Python when subscripting sequences? python python

What is :: (double colon) in Python when subscripting sequences?


python syntax slice

it means 'nothing for the first argument, nothing for the second, and jump by three'. It gets every third item of the sequence sliced.Extended slices is what you want. New in Python 2.3

python syntax slice

Python sequence slice addresses can be written as a[start:end:step] and any of start, stop or end can be dropped. a[::3] is every third element of the sequence.

python syntax slice

seq[::n] is a sequence of each n-th item in the entire sequence.

Example:

>>> range(10)[::2][0, 2, 4, 6, 8]

The syntax is:

seq[start:end:step]

So you can do (in Python 2):

>>> range(100)[5:18:2][5, 7, 9, 11, 13, 15, 17]

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