Contents:
An immutable sequences of chars. No unicode support.
Create a str object with a literal string.
Return the concatenation of this and t
Equivalent to adding this to itself n times
Return the i-th character
Return the string slice from i to j
Return the string slice from i to j with step k
Return the index of the first occurrence of x in this
Return the index of the first occurrence of x in this (at or after index i)
Return the total number of occurrences of x in this