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Welcome back everyone to the section on Python object and data structure basics.

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So in this section of the course we're going to start off by discussing basic data types.

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And these are your basic building blocks of code.

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When constructing larger pieces of code and we're going to quickly discuss all the possible data types

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that we're going to talk about in this section and then we'll have lectures that go into a lot more

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detail about each one.

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So don't worry about memorizing all the information shown here.

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This is more just a quick overview.

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And there's going to be a lecture on each of these data types as we go on throughout this section.

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So the data types that we're going to be discussing are the following in this table.

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Here we have the name of the data type on that left hand column.

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And then there's the type.

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So what that means is just Python has an internal key word for this name and you're not going to get

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the whole word integer the whole word floating point instead Python has kind of a shortened keyword.

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So that's the second column such as I.A. for integer SDR for strings etc. then we have the description

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column and that's just going to be what the actual description of the data type is.

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So let's quickly go through these.

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We start off with integers and those are just basic whole numbers such as three three hundred two hundred.

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Then we have floating point numbers.

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And those are numbers of a decimal point 2.3 4.6 hundred point zero.

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And notice here that if even if you have a hundred point zero that still counts as a floating point

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number that's no longer an integer because it has a decimal point.

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Then after that we have strings and strings are in ordered sequence of characters.

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You can think of these as just kind of words but you should also note they can be numbers as well as

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foreign characters inside of a string.

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The main thing that denotes a string is that either has double quotes or single quotes.

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Here we can see we have hello and double quotes Sammy in single quotes.

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We have the digits of 2000 inside double quotes.

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That makes a string.

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It's no longer just an integer because it has double quotes around it.

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And then you can also see we have some Japanese characters inside the quotes.

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Then we come to data structures and data structures are a little more specialized in basic data types

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and data objects because they can actually hold data objects in some sort of sequence or in some sort

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of mapping.

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So here we have lists and these are an ordered sequence of objects.

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Here we can see that we've been able to use square brackets and commas to you have a sequence of other

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objects such as the number 10 the string hello.

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And then the number two hundred point three dictionaries are another data structure that can store other

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data types except in this case instead of having an ordered sequence.

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They have unordered key value pairs.

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And we'll be discussing in a lot more detail how dictionaries work.

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But here we can see that we have a key than a colon and then a value and it's denoted by curly braces

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as far as if it's a dictionary instead of just being a normal list which has square brackets then we

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can have something like name and then colon and then the value of that name is Franki.

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Again we'll be discussing dictionaries in a lot more detail after dictionaries we have tuples sometimes

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are also called couples.

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And these are ordered immutable sequences of objects.

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They look a lot like glyphs except they have parentheses and they're immutable meaning you cannot change

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an object that's already in that sequence.

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So we'll be discussing what immutable means.

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And a lot more detail when discussing tuples than we have sets which are an unordered collection of

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unique objects.

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And again we'll talk about that and a lot more detail there.

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A little similar to a dictionary but they don't have key value pairs.

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Instead they're just unique objects in an ordered collection.

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So you don't have that colon key value pair.

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Again we'll discuss it in more detail later on.

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Then finally we'll talk about booleans which are just logical value values indicating true or false.

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Notice how we have capital T in capital F that sort of syntax is necessary for Python.

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So those are all the basic data types.

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Again don't worry if you didn't understand any of this or didn't want to memorize any of this we're

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going to have a lecture on Basically each of these topics in a lot more detail and show you how you

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can use them to write your own code.

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OK let's get started.

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I'll see you at the next lecture.