Python if-else Statements Tutorial

if(Conditional) statements are an essential part of programming as they allow you to control the flow of execution based on certain conditions. In Python, if-else statements are used to execute different blocks of code depending on the truth value of a given expression. In this tutorial, we'll learn how to use if-else statements in Python.

Python if-else statements Syntax

if condition:
    # execute this block of code if condition is True
else:
    # execute this block of code if condition is False

condition is an expression that returns a boolean value (True or False). If condition is True, the code inside the if block is executed. If condition is False, the code inside the else block is executed.

Example

Let's take a simple example to understand how if-else statements work in Python:

age = 22

if age >= 18:
    print("You are old enough to vote!")
else:
    print("You are not old enough to vote yet.")

Output:

You are old enough to vote!

Nested if-else Statements

We can also have nested if-else statements in Python, where an if block can contain another if-else block:

age = 24

if age >= 18:
    if age == 18:
        print("Congratulations! You have just become eligible to vote.")
    else:
        print("You are old enough to vote!")
else:
    print("You are not old enough to vote yet.")

Output:

You are old enough to vote!

Multiple Conditions with elif

We can use the elif keyword to test multiple conditions in Python:

score = 88

if score >= 90:
    grade = "A"
elif score >= 80:
    grade = "B"
elif score >= 70:
    grade = "C"
elif score >= 60:
    grade = "D"
else:
    grade = "F"

print("Your grade is " + grade)

Output:

Your grade is B

Explore Other Related Articles

Python set tutorial
Python tuple tutorial
Python Lists tutorial
Python dictionaries comprehension tutorial
Python comparison between normal for loop and enumerate