Colon (:) in Python list index

Colon (:) in Python list index

: is the delimiter of the slice syntax to slice out sub-parts in sequences , [start:end]

[1:5] is equivalent to from 1 to 5 (5 not included)
[1:] is equivalent to 1 to end
[len(a):] is equivalent to from length of a to end

Watch at around 40:00 he starts explaining that.

Works with tuples and strings, too.

slicing operator. and scroll down a bit

Colon (:) in Python list index

a[len(a):] – This gets you the length of a to the end. It selects a range. If you reverse a[:len(a)] it will get you the beginning to whatever is len(a).

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