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Welcome back everybody.

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This lesson will teach you to deal with outer list that contain inner list

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and dictionaries as items and similarly,

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dictionaries whose values are lists or other dictionaries.

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We call it a nested data structure.

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It is a little bit like one of these Russian dolls.

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This one's painted as a robot,

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where there's an outer doll and inside it,

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there's another doll, a sublist.

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Eventually, you get down to something that's not a container,

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like a string or an integer or a turtle instance.

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But you might have to descend a few layers to get to it.

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In this lesson, we'll also get our first look at

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the JSON data format which lets you represent

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a very nested list or dictionary as a long text string

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so that you can store it in a file and read it later or send it to another computer.

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At the end of this lesson,

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you should be able to use square brackets

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repeatedly to pull data elements out of a nested data structure,

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and you should be able to read from and write to

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strings that are in the JSON format using the Python JSON module.

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I'll see you at the end for recap and some funny jokes. Bye for now.