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Hi and welcome to a new section in this course in this section.

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I want to talk about Michael Python module's Michael Python module's just like a regular python.

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Modules are files that contain functions and code that you can import and use in your own scripts.

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Very often we tend to use the word libraries instead of modules, but those two words are equivalent.

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You they can use either one and understand what you're talking about myself.

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I often use the word libraries instead of modules.

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So just wanted to give you a quick example of what a module can do for your programming and for your

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productivity.

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And in the next few lectures in this section, I'm going to talk about the modules that you find integrated

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into my python.

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So let's call those built in modules and then there are the community modules.

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So these are modules that are contributed by people that use micro python or python.

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And what we're going to show you how to install such community modules.

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This script is a script that I'm demonstrating in a later lecture, and it's showing how to use a two

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by 16 LCD screen with your E.S.P 32.

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Now, if you notice here in line thirty seven, I am importing an external module and the name of this

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module is E.S.P eight two six six.

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And it going see underscore L'Occitane now using the Keywood as.

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To nominate a different name by which I'm going to reference the contents of this module in my script

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so you can sit down here, for example, in line 44, where I am creating a object out of this eye to

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see LCD class that I'm using the nominated names specified after the keyword.

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So you can do things like that in order to shorten perhaps a name of a very long named module.

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Now, back to the module itself.

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The name that I'm using here to input the module is simply the name of the file for that same module.

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So if you look here in my micro python device file listing, you'll see that there is a file with the

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exact same name, except that it also has the dot p y extension and have opened it up right here.

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And you can have a look at it.

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So this is the.

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Module that I am importing and you can see the code in it and you can see what it does.

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Now, the other interesting thing to notice here is that this module actually has one more dependency.

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So you can see in line number four, it depends on another module.

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That is also an external module that I had to download from its source called LCD API.

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And you can get from this the actual file name of the file that contains this module is LCD and the

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API dot p y, which is right here.

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But this is a fairly large module, don't click on and then you can have a look inside, you can see

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that it's called one class here called the LCD API, and it's got a bunch of functions in it.

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And so therefore it's quite large.

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And for that reason, I'm using the key word import to import a specific class instead of importing

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the whole lot.

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Now, imagine that this file of this module contained to multiple classes.

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So instead of just the single one that this one contains.

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Imagine that he had multiple classes.

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By using this type of notation, you can narrow down the class or classes that you want to import as

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opposed to importing the entire module, which is something very useful when you're working with devices

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that have limited capacity.

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So all this is stored in RAM.

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Of course, when you import and instantiate a class and you have an object to work with or that is in

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RAM.

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So by being selective about the components of a module that you want to import, then you can preserve

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the resources of your microcontroller unit in the same file here.

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Just to continue this for one more step.

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You can see that we are also importing modules from machine and from time.

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And these these modules are built into micro python, which means that we don't have to install the

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files that contain those modules like we did with the DSP.

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So we can notice here that there is no file called machine PCI or time dot behind this, because these

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two modules are built in two micro parties.

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They come with the language and they're part of the interpreter.

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So that's just the quick introduction about modules.

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We can understand the concept behind them and why they are useful.

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So that means we can go ahead into the next couple of lectures where I can talk more about built in

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modules, show you a few things about them, including where to find the documentation, because there

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are a lot of them.

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There's no way that I'd be able to cover them in this course.

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But I'll give you the source of all the information that you need.

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And then in the lecture after that, I'll show you how to search the community on the Internet in order

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to look and find micro python modules that would be useful for your project for go into.