Loops in Python: Mastering for and while Loops with Examples

Introduction: Why Loops Are Essential in Python

An essential component of programming is loops. Loops in Python enable you to run a piece of code more than once, increasing code efficiency and decreasing repetition. Loops are essential for processing a list of user inputs, reading files, and automating operations.

With the help of clear examples and practical applications, this blog will teach you how to use Python’s for and while loops.

📌 What Are Loops in Python?

A loop is a control structure that repeatedly executes a block of code until a certain condition is met. Python supports two main types of loops:

When it comes to iterating over a sequence, such as a list, string, or range, the for loop is utilized.
When you want a block of code to run only if a condition is met, you use a while loop.

✅ Python `for` Loop Explained

🔹 Syntax:

for variable in sequence:
    # Code to execute

🔹 Example 1: Loop through a list

fruits = ["apple", "banana", "mango"]
for fruit in fruits:
    print(fruit)

Output:

apple
banana
mango

🔹 Example 2: Use of `range()` function

for i in range(5):
    print(i)

Output:

🔹 Use Case: Sum of numbers using a `for` loop

total = 0
for num in range(1, 11):
    total += num
print("Sum:", total)

You can also read for:- If Else Statement Java With Examples-2024

Python `while` Loop Explained

🔹 Syntax:

while condition:
    # Code to execute

🔹 Example 1: Print numbers 1 to 5

count = 1
while count <= 5:
    print(count)
    count += 1

🔹 Example 2: Basic Login System

password = "python123"
user_input = ""

while user_input != password:
    user_input = input("Enter password: ")
print("Access granted.")

🚫 Infinite Loops in Python

You risk creating an endless loop that never ends if you’re not careful.

Example:

while True:
    print("This will run forever!")

Use break or a proper condition to avoid infinite loops.

🔄 Loop Control Statements in Python

🔸 `break` – exits the loop

for i in range(10):
    if i == 5:
        break
    print(i)

🔸 `continue` – skips the current iteration

for i in range(5):
    if i == 2:
        continue
    print(i)

🔸 `else` with loops

for i in range(3):
    print(i)
else:
    print("Loop completed!")

⚙️ Real-Life Applications of Loops in Python

Going over API replies again
Automating routine activities
Perusing extensive datasets
Sending a lot of emails
Creating simulations or gamess

🧠 Final Thoughts: Master Loops, Master Python

You may advance your proficiency with Python by mastering the for and while loops. Learning loops is a crucial step in becoming a competent Python developer, regardless of programming experience level.

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Loops in Python: Mastering for and while Loops with Examples