Lecture 37:- Loops In Python

In Python, loops are used to execute a block of code repeatedly until a certain condition is met. There are two main types of loops in Python: for loop and while loop.

1. for loop: The for loop is used to iterate over a sequence, such as a list, tuple, string, or range of numbers. It allows you to execute a block of code for each item in the sequence.

Syntax:

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for item in sequence:    # Code block to execute for each item

Example:

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

Output:

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apple banana orange

1. while loop: The while loop is used to execute a block of code as long as a certain condition is true. It continues to execute the code until the condition becomes false.

Syntax:

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while condition:    # Code block to execute while the condition is true

Example:

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

Output:

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1 2 3 4 5

In this example, the while loop is used to print numbers from 1 to 5. The loop continues as long as the count variable is less than or equal to 5. The count += 1 statement increments the value of the count variable by 1 in each iteration.

Loops are powerful constructs that enable you to automate repetitive tasks and process large amounts of data efficiently. You can use loops to traverse collections, perform calculations, validate user input, and much more. Be careful to provide an exit condition for the loop to prevent infinite loops.