Loops in Python

Loop in python is a construct that allows you to repeat a block of code for a specific number of times or until a certain condition is met. Loops are essential for iterating over data structures like lists, tuples, and strings.

Looping means repeating something over and over until a particular condition is satisfied. A for loop in Python is a control flow statement that is used to repeatedly execute a group of statements as long as the condition is satisfied. Such a type of statement is also known as an iterative statement.

Python provides two primary types of loops:

  1. For Loop
  2. While loop

For Loop in python

Used for sequential traversal, such as going through a list or string. The for loop iterates over an iterable object (like a list or a range) and executes a block of code for each item.

Here’s the basic syntax:

for item in iterable:
    # Code to execute

For example, to print numbers from 1 to 10:

for num in range (1, 11):
print(num)

While Loop:

Executes a block of statements repeatedly until a given condition is satisfied. When the condition becomes false, the program proceeds to the line immediately after the loop.

 The syntax for a while loop is as follows:

while expression:
    # Code to execute

For instance, printing “myitschools” five times using a while loop:

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

You can also use an else statement with a while loop. The else block is executed when the loop condition becomes false:

count = 0
while count < 3:
    count += 1
    print (\"Hello Geek\")
else:
    print (\"In Else Block\")

Notes:

  • for loops are ideal for iterating over known sequences (e.g., lists, tuples).
  • while loops are useful when the number of iterations is uncertain or depends on dynamic conditions.
  • Be cautious with infinite while loops; ensure a proper exit condition.