Python if-else conditional loop with Nested loop

Python If-Else Condition: A Comprehensive Guide

Conditional statements are essential in programming, allowing you to make decisions based on specific conditions. Python's if-else condition helps control the flow of execution by running different blocks of code depending on whether a condition is True or False. In this guide, we will cover everything about if-else conditions, their syntax, and how they work with simple and fun examples.

1. Understanding the If Statement

The if statement executes a block of code only if a specified condition is True. If the condition evaluates to False, the code inside the if block is skipped.

# Simple if statement
age = 18
if age >= 18:
    print("You are eligible to vote!")

Flow Explanation: The program checks if age is greater than or equal to 18. If yes, it prints "You are eligible to vote!". If no, nothing happens.

2. Adding the Else Statement

The else statement ensures that a block of code runs when the if condition is not met.

# If-else example
age = 16
if age >= 18:
    print("You are eligible to vote!")
else:
    print("Sorry, you need to wait a bit longer.")

Flow Explanation: The program checks the condition. Since age is less than 18, the else block executes, displaying "Sorry, you need to wait a bit longer.".

3. The Elif Statement

The elif statement allows you to check multiple conditions in a structured way instead of using multiple if-else statements.

# Using elif
num = 0
if num > 0:
    print("Positive number")
elif num < 0:
    print("Negative number")
else:
    print("Zero")

Flow Explanation: The program checks whether num is positive, negative, or zero, and executes the corresponding block.

4. Nested If-Else Statements

Python allows nesting if-else statements inside each other, enabling more complex decision-making.

# Nested if example
time = 10
if time < 12:
    print("Good morning!")
    if time < 6:
        print("Wow, you're up early!")
else:
    print("Good afternoon!")

Flow Explanation: The program first checks if time is less than 12. If true, it prints "Good morning!" and then checks if time is before 6 AM, printing another message.

Example: Pizza Ordering Decision

Let's add some humor! Imagine a scenario where you decide whether to order a pizza based on your hunger level and wallet balance.

# Pizza ordering decision
hungry = True
wallet_balance = 10

if hungry:
    if wallet_balance >= 15:
        print("Ordering a large pizza!")
    elif wallet_balance >= 10:
        print("Ordering a medium pizza!")
    else:
        print("Instant noodles it is!")
else:
    print("Not hungry, maybe later.")

Flow Explanation: The program first checks if the user is hungry. If true, it checks the wallet balance and decides the pizza size. If the balance is low, the user settles for instant noodles.

5. One-Line If-Else (Ternary Operator)

Python allows writing if-else conditions in a single line, making the code more concise.

# One-line if-else
status = "Allowed" if age >= 18 else "Not Allowed"
print(status)

Flow Explanation: This is a shorthand for if-else statements. If age is 18 or more, "Allowed" is stored in status, otherwise, "Not Allowed".

Conclusion

The if-else condition in Python is a fundamental concept that allows you to control program execution based on conditions. From simple if statements to nested conditions and even fun examples, mastering this concept will enhance your programming skills. Try experimenting with different conditions and have fun coding!