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You've now seen the most important methods that you'll be using on lists and strings,

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and a few more obscure ones that you'll only rarely use.

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You should now be able to read and write code using those methods,

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you should be able to extend the list using

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either append or concatenate to add more items onto the end of it,

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and you should be able to identify whether a method mutates

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an object or creates a modified copy of it,

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methods on tuples and strings,

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reminder they can never mutate them they,

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can only make modified copies because tuples and strings are immutable.

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Some operations on lists mutate them; assignment,

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deletion, append, insert, reverse,

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sort, remove, and pop.

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Those are mutate lists index and count,

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leave them alone and just tell you some property of those lists.

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So, today's joke, how can you get two cats in the same room?

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You can catenate them,

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see you on the flip side.