Python Loops Explained with Examples

Loops are one of the most important concepts in programming. They allow you to execute a block of code multiple times without rewriting it. In Python, loops are widely used for iteration, data processing, and automation tasks.

What is a Loop?

A loop is a control structure that repeats a block of code as long as a condition is true or for a specific number of iterations.

Types of Loops in Python

for loop
while loop

For Loop

The for loop is used to iterate over a sequence such as a list, tuple, string, or range.

              
Python

            # for loop example
for i in range(1, 6):
    print(i)

Looping Through List

              
Python

            numbers = [10, 20, 30]
for num in numbers:
    print(num)

While Loop

The while loop runs as long as the condition is true.

              
Python

            # while loop example
count = 1
while count <= 5:
    print(count)
    count += 1

Break Statement

The break statement is used to exit the loop immediately.

              
Python

            for i in range(1, 10):
    if i == 5:
        break
    print(i)

Continue Statement

The continue statement skips the current iteration and moves to the next one.

              
Python

            for i in range(1, 6):
    if i == 3:
        continue
    print(i)

Nested Loops

A loop inside another loop is called a nested loop.

              
Python

            # nested loop example
for i in range(1, 4):
    for j in range(1, 4):
        print(i, j)

Loop with Else

Python allows an else block with loops which executes when the loop finishes normally.

              
Python

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

Real-World Applications

Processing large datasets
Automation scripts
Game development
Data analysis
Web scraping

Common Mistakes to Avoid

Infinite loops in while
Incorrect loop conditions
Improper indentation
Misusing break and continue
Not updating loop variables

Advanced Concepts

List comprehension
Generator expressions
Iterators and iterables
Loop optimization
Parallel loops

Practice Exercises

Print numbers 1 to 100
Find sum of numbers using loop
Print multiplication table
Reverse a list using loop
Count vowels in string

Conclusion

Loops are essential for writing efficient and scalable programs. By mastering for loops and while loops, you can automate repetitive tasks and build powerful applications.

Note: Note: Always ensure proper loop conditions to avoid infinite loops.