Lesson 7 - Functions

Python Functions

A function is a block of code which only runs when it is invoked. The idea is to put some commonly or repeatedly done tasks together and make a function.
You can pass data, known as parameters, into a function. A function can return data as a result.

Creating a Function

In Python a function is defined using the def keyword:

Example:

def my_function():
  print(“Hello world”)

Calling a Function

To call a function, use the function name followed by parenthesis:

Example:

def my_function():
  print(“Hello world”)
my_function()

Passing  parameter to a function
The below function print_name(x),  takes x as a parameter and uses it inside the function

def print_name(x):
  print(x)
print_name(“John”)

The print_name function is called by passing “John” as a parameter.  The print function prints John

Returning data from a function

The add number function below adds two numbers and return 

def add(num1, num2):
     num3 = num1 + num2
     return num3

num1  = 4;
num2 = 8;
result = add(num1, num2)
print(f”The addition of {num1} and {num2} results {result}.”)