We'll look at strings from a number of
viewpoints: semantics, literal values, operations, comparison operators,
built-in functions, methods and modules. Additionally, we have a
digression on the immutability of strings.
A string is an immutable sequence of
characters. Since it is a sequence, all of the common operations to
sequences apply. We can append strings together,
select characters from a string. When we select a
slice from a string, we've extracted a
substring.
