Python Track · Part 3 of 9

Python Functions and Modules

Define and call Python functions, pass arguments, return values, and import modules and libraries such as math.

3.1 Defining and Calling Functions

Defining a Function : A function in Python is a reusable block of code that performs a specific task. To define a function, you use the def keyword followed by the function name and a pair of parentheses.

Calling a Function : Once a function is defined, you can call it by using its name followed by parentheses, passing any required arguments (if any).

# define function
def greet(name):
    print(f"Hello, {name}!")

# calling function

greet("Gujuri Alekha")

Hello, Gujuri Alekha!

3.2 Function Arguments and Return Values

Function Arguments: Functions can accept input values called arguments or parameters. These values are passed into the function when it’s called and can be used inside the function.

Return Values : Functions can also return values using the return statement. A function can return one or multiple values.

# Function Arguments and Return Values
def add(x, y):
    result = x + y
    return result

# call the function
sum_result = add(8, 5)
print(f"Sum of {x} & {y} is : {sum_result}")

Sum of 5 & 5 is : 13

3.3 Importing Modules and Libraries

• Python allows you to organize your code into modules and libraries to make it more manageable. A module is a Python file containing functions, variables, and classes, while a library is a collection of modules.
• You can import modules or specific functions/classes from modules using the ’ import ’ statement.

# Importing the entire math module
import math
result = math.sqrt(16)
print(f"square root of {16} is  : {result}")

# Importing only the sqrt function from math
from math import sqrt
Result = sqrt(49)
print(f"square root of {49} is  : {Result}")

square root of 16 is  : 4.0
square root of 49 is  : 7.0

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