Creating & Importing modules

 Creating & Importing modules

Creating and importing modules in Python is a fundamental concept that allows you to organize your code into reusable and manageable components. Let's go through the process of creating a module and then importing it into another Python script.

### Creating a Module:

1. Create a Python File:

   - Start by creating a new Python file. For example, let's create a file named `mymodule.py`.

2. Define Functions or Variables:

   - In `mymodule.py`, define functions, classes, or variables that you want to include in the module:

   ```python

   # mymodule.py

   def greet(name):

       return f"Hello, {name}!"

   pi = 3.14159

   ```

### Importing a Module:

Now, let's create another Python script and import the `mymodule` module.

1. Create Another Python File:

   - Create a new Python file in the same directory as `mymodule.py`. For example, let's create a file named `main.py`.

2. Import the Module:

   - In `main.py`, import the `mymodule` module using the `import` keyword:

   ```python

   # main.py

   import mymodule

   name = "Alice"

   message = mymodule.greet(name)

   print(message)

   print("Value of pi:", mymodule.pi)

   ```

3. Run the Main Script:

   - Run `main.py` using a Python interpreter. It will import `mymodule.py` and use the functions and variables defined within it.

   ```

   $ python main.py

   Hello, Alice!

   Value of pi: 3.14159

   ```

In this example, `mymodule.greet(name)` calls the `greet()` function from the `mymodule` module, and `mymodule.pi` accesses the `pi` variable from the module.