Introduction to Functions

What are functions?

We divide a problem into subproblems and resolve a specific subproblem or task using a function. A Python function is a block of code that performs a specific and well-defined task.

Advantages of functions

Two main advantages of functions are:

• They help us divide our program into multiple tasks. For each task, we can define a function. This makes the code modular.
• Functions provide a reuse mechanism. The same function can be called any number of times.

Types of function

There are two types of Python functions:

• Built-in functions like len(), sorted(), min(), max(), etc.
• User-defined functions

An example of a user-defined function is shown below. A function can be called any number of times.

Note: The body of the function must be indented appropriately.