Home » Posts tagged 'Nested loops in Python'

Tag Archives: Nested loops in Python

Newly Updated Posts

Related Topics

Introduction of related Topics

Python Break Statement

21st May 2023

In this tutorial, we are going to learn Python Break Statement

The break command in Python is used to end or escape a loop early. It is mainly utilised with loops like for and while to abruptly break the loop’s regular flow.

When the break statement is encountered within a loop, the program jumps out of the loop and continues execution with the next statement after the loop. This allows you to skip the remaining iterations of the loop and proceed with the rest of the code.

Here’s the general syntax of the break statement:

while condition:
    # Some code here
    
    if condition:
        break
    
    # More code here

OR

for item in iterable:
    # Some code here
    
    if condition:
        break
    
    # More code here

In the above examples, the break statement is used inside a loop. If the specified condition evaluates to True, the break statement is executed, and the loop is immediately terminated. The program then continues execution with the next statement after the loop.

Here’s an example to illustrate the usage of the break statement:

numbers = [1, 2, 3, 4, 5]

for num in numbers:
    if num == 3:
        break
    print(num)

print("Loop finished")

Output:
1
2
Loop finished

In the above code, the break statement is encountered when num is equal to 3. As a result, the loop is terminated, and the program moves to the next statement after the loop, which is print("Loop finished").

Note that the break statement only terminates the innermost loop in nested loops. If you have multiple nested loops, you can use additional control flags or techniques to break out of outer loops if needed.

Remember, the break statement is a useful tool for controlling the flow of your loops and providing flexibility in your program logic.

Python Loop

19th May 2023

Explore our Python tutorials for beginners In this Tutorial , we will learn looping concepts in Python.

In Python, loops are used to repeat a specific block of code multiple times. They allow you to iterate over a sequence of elements or execute a block of code until a specific condition is met. Python provides two types of loops: the for loop and the while loop.

1. For Loop: The for loop is used to iterate over a sequence (such as a list, tuple, string, or range) or any iterable object. It has the following syntax:

for variable in sequence:
    # code block

Here, variable is a variable that takes on the value of each element in the sequence during each iteration. The code block under the loop is executed for each element in the sequence.

Example 1: Printing each element of a list using a for loop:

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

Example 2: Calculating the sum of numbers in a range using a for loop:

total = 0

for num in range(1, 6):

total += num

print(total)

2. While Loop: The while loop repeatedly executes a block of code as long as a given condition is true. It has the following syntax:

while condition:
    # code block

The code block is executed as long as the condition remains true. If the condition becomes false, the loop is terminated, and the program continues with the next statement after the loop.

Example 1: Printing numbers from 1 to 5 using a while loop:

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

Example 2: Finding the factorial of a number using a while loop:

num = 5
factorial = 1
while num > 0:
    factorial *= num
    num -= 1
print(factorial)

It’s important to ensure that the loop condition eventually becomes false; otherwise, the loop will continue indefinitely, resulting in an infinite loop.

Both for and while loops can be controlled using statements like break (to exit the loop) and continue (to skip the current iteration and move to the next).