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Welcome back. This lesson,

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you'll learn a bunch of useful methods on lists and strings.

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At the end, you'll be able to read and write code using

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the following methods for lists; append, insert,

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reverse, sort remove, pop,

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and some non-destructive methods, index and count.

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For strings, you'll learn upper, lower,

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count, index, strip and replace.

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At the end of this lesson you'll be able to extend the list

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using either append or concatenate.

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Very importantly, you'll be able to identify whether a method mutates an object,

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or creates a modified copy of it.

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Methods on tuples and strings can never mutate them,

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only make modified copies.

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Some operations on lists mutate them,

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assignment and deletion you saw previously,

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and new methods that we'll talk about it in this lesson append, insert,

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reverse, sort, remove and pop,

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they all mutate lists.

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Good luck. See you after the screen casts.