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So you can use existing Python modules,

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but you can also create your
own module if you want to.

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Here I'm not going to
explain every possible thing

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about module creation, just
the basics to get you started.

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And I'm going to go back to the add to
inst.py that we have written previously.

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Here we have a function to add two numbers.

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Let's say now I want to use
that function in a different file.

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So what I'm going to do,
I'm going to copy and paste

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this function every time I need to
use it, which is really not convenient.

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So I'm going to create a
new file here, new Python file,

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and I'm going to name
it my computations.py,

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which is going to be the name
of the module, my computations.

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I'm going to take the function
here, put it in my computations.py.

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And well, that is simply
the module for now,

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which contains a file
name and then one function.

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And so in this module, you can
add as many functions as you want.

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Make sure you don't add a code like this,

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code that is going to
run when you call the file.

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So just add functions, don't
write any other code, just functions.

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And now let's go back
to the add to inst.py.

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I'm going to remove that function.

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And so you can see now we have an error,
because add to numbers is not recognized.

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What I'm going to do, I'm going
to do import my computation.

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And I'm going to do here my
computations.addToNumbers.

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So as you can see, when
you import a built-in module

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or your own module, that's
exactly the same thing.

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And a module is nothing else.

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So a very simple module is nothing else.

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It just a Python file
with some functions in it.

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So here import my computations.

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And then I do my computations.addToNumbers,
which is the function here.

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And I can use the function.

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If I just want to import the function,

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I can do from my
computations import

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addToNumbers, just like
we did with the OS module.

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And now I can just use the add to numbers

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without providing name
of the module before that.

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And this way, so if you add
many more functions here

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and you just want to
use the add to numbers,

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you are just going to import
the add to numbers function.

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And one last thing is make sure to
provide a meaningful name for your module.

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So here as a test, I just put
my in front, my computations.

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Make sure to use a meaningful name, which
clearly states what this module is about.