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Strings and indexing

A string is a sequence of characters. Each character has an index starting at 0, and negative indices count backwards from $-1$ . A slice s[i:j] gets the characters from index $i$ up to and including $j-1$ .

s[i]

the character at index

i

s[i:j]

slice from

i

up to and including

j-1

s[-1]

the last character

Symbols

$s$	a string (or list)
$i,\ j$	start and end index

Example

s = "robotikk"

s[2:6] gives "boti" (indices 2, 3, 4, 5).

s[-1] gives "k".

The length of s[i:j] is

j - i

— the last index is never included.

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