Python Loops

Python loops are essential programming constructs that enable you to execute a block of code multiple times, automating repetitive tasks within your programs. This guide will provide a detailed overview of loops in Python, including their types and control statements.

Key Concepts

1. What are Loops?
   • Loops are used to repeat a block of code.
   • They help in iterating over sequences like lists, tuples, and strings.
2. Types of Loops in Python
   • For Loop
   • While Loop

For Loop

The for loop iterates over a sequence (like a list, tuple, or string).

Syntax:

for variable in sequence:
    # Code block to execute

Example:

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

Output:

apple
banana
cherry

While Loop

The while loop continues to execute as long as a specified condition is True.

Syntax:

while condition:
    # Code block to execute

Example:

count = 0
while count < 3:
    print(count)
    count += 1

Output:

0
1
2

Loop Control Statements

• Break: Terminates the loop prematurely.
• Output:
• Continue: Skips the current iteration and proceeds to the next.
• Output:

0
1
3
4

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

0
1
2

for num in range(5):
    if num == 3:
        break
    print(num)

Conclusion

Loops are crucial for writing efficient and concise code in Python. Understanding how to use for and while loops, along with control statements like break and continue, will significantly enhance your programming capabilities. Experimenting with these concepts will help you become more comfortable with Python.