Python Modules

Python Modules

What is a Module?

Consider a module to be the same as a code library.

A file containing a set of functions you want to include in your application.


Create a Module

To create a module just save the code you want in a file with the file extension .py:

Example

Save this code in a file named mymodule.py

Use a Module

Now we can use the module we just created, by using the import statement:

Example

Import the module named mymodule, and call the greeting function:

Run Example »

Note: When using a function from a module, use the syntax: module_name.function_name.


Variables in Module

The module can contain functions, as already described, but also variables of all types (arrays, dictionaries, objects etc):

Example

Save this code in the file mymodule.py

Example

Import the module named mymodule, and access the person1 dictionary:

Run Example »

Naming a Module

You can name the module file whatever you like, but it must have the file extension .py

Re-naming a Module

You can create an alias when you import a module, by using the as keyword:

Example

Create an alias for mymodule called mx:

Run Example »


Built-in Modules

There are several built-in modules in Python, which you can import whenever you like.

Example

Import and use the platform module:

Try it Yourself »


Using the dir() Function

There is a built-in function to list all the function names (or variable names) in a module. The dir() function:

Example

List all the defined names belonging to the platform module:

Try it Yourself »

Note: The dir() function can be used on all modules, also the ones you create yourself.


Import From Module

You can choose to import only parts from a module, by using the from keyword.

Example

The module named mymodule has one function and one dictionary:

Example

Import only the person1 dictionary from the module:


 

Run Example »

Note: When importing using the from keyword, do not use the module name when referring to elements in the module. Example: person1["age"]not mymodule.person1["age"]


Test Yourself With Exercises

Exercise:

What is the correct syntax to import a module named “mymodule”?

Start the Exercise

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