How To Import Modules in Python 3

Python 3 allows you to use code from other files by importing modules. This is a powerful feature that allows you to write complex programs by breaking them down into smaller, reusable components.

Step 1: Create a Module

The first step to using modules in Python 3 is to create a module. A module is simply a file containing Python code. To create a module, you can create a new file with a .py extension and write your code in that file. Here's an example:

    
    # example_module.py
    
    def add_numbers(x, y):
        return x + y
    
    def subtract_numbers(x, y):
        return x - y
    
    

In this example, we've created a module called example_module.py that contains two functions, add_numbers and subtract_numbers.

Step 2: Import the Module

Once you've created a module, you can use it in your Python code by importing it. To import a module, use the import statement followed by the name of the module (without the .py extension). Here's an example:

    
    # main.py
    
    import example_module
    
    print(example_module.add_numbers(1, 2))
    print(example_module.subtract_numbers(3, 4))
    
    

In this example, we've imported the example_module module and used its functions add_numbers and subtract_numbers.

Step 3: Import Specific Functions from a Module

If you only need to use one or two functions from a module, you can import them specifically using the from statement. Here's an example:

    
    # main.py
    
    from example_module import add_numbers
    
    print(add_numbers(1, 2))
    
    

In this example, we've imported only the add_numbers function from the example_module module.

Step 4: Import a Module with an Alias

If you want to use a different name for a module in your code, you can give it an alias when you import it. Here's an example:

    
    # main.py
    
    import example_module as em
    
    print(em.add_numbers(1, 2))
    
    

In this example, we've imported the example_module module and given it the alias em.

Conclusion

Using modules in Python 3 is a powerful way to write complex programs by breaking them down into smaller, reusable components. By following the steps outlined in this tutorial, you'll be able to create and use modules in your own Python programs.

Keywords: Python 3, import modules, create a module, import statement, from statement, module alias.