Welcome back. This lesson,
you'll learn a bunch of useful methods on lists and strings.
At the end, you'll be able to read and write code using
the following methods for lists; append, insert,
reverse, sort remove, pop,
and some non-destructive methods, index and count.
For strings, you'll learn upper, lower,
count, index, strip and replace.
At the end of this lesson you'll be able to extend the list
using either append or concatenate.
Very importantly, you'll be able to identify whether a method mutates an object,
or creates a modified copy of it.
Methods on tuples and strings can never mutate them,
only make modified copies.
Some operations on lists mutate them,
assignment and deletion you saw previously,
and new methods that we'll talk about it in this lesson append, insert,
reverse, sort, remove and pop,
they all mutate lists.
Good luck. See you after the screen casts.