Python Language - 04

 

Modules and Functions

    A module in Python is a collection of functions, classes, and variables that are stored in a single file with a '.py' extension. Modules allow you to reuse code across multiple projects and also help you organize your code.
A function in Python is a block of code that can be executed by calling its name and passing in any required parameters. Functions help you to break down a large program into smaller, more manageable parts. Functions also make it easier to test and debug your code. Here's an example of a simple function in Python:

    

In this example, the function 'greet' takes one parameter, 'name', and prints a greeting message. When the function is called and passed 'John' as an argument, it prints the message 'Hello, John!'. You can also import functions from other modules and use them in your code. For example:

     

In this example, the function 'add' is defined in the module 'math_functions.py'. To use this function in 'main.py', we import it using the 'import' statement. We then call the function using the module name followed by the function name, and pass in the arguments '2' and '3'. The function returns the sum of '2' and '3', which is '5', and this value is stored in the variable 'result'.