Welcome back, everyone! In this article, we'll walk you through the solutions for the Week 2 programming assignment of the NPTEL course "Joy of Computing Using Python." These answers are provided for reference, so feel free to use them as a guide. If you have any doubts or questions, don't hesitate to ask in the comments section below. Ready to dive in? Let's solve these problems together!

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NPTEL Joy Of Computing Using Python Week 3 Programming Assignment 2024

Last Date: 15-08-2024 

Q1. Create a Python program that finds the second largest number in a list of positive integers(includes zero). The program should prompt the user to input a list of numbers, then compute and print the second largest number in that list.

Input Format:
The input consists of a single list of numbers, separated by spaces.
Hint: Use .split() function to convert input to list.

Output Format:
The output consists of the second largest number in the input list.

Example:

Input:
3 1 4 1 5 9 2 6 5 3 5

Output:
6

Program Code: 

# Function to find the second largest number in a list

def find_second_largest(numbers):

    # Convert the list to a set to remove duplicates

    unique_numbers = list(set(numbers))

    

    # Sort the unique numbers in descending order

    unique_numbers.sort(reverse=True)

    

    # Return the second element, which is the second largest

    return unique_numbers[1] if len(unique_numbers) > 1 else None

# Main program

# Prompt the user to input a list of numbers, separated by spaces

input_numbers = input()

# Convert the input string to a list of integers

numbers_list = list(map(int, input_numbers.split()))

# Find and print the second largest number

second_largest = find_second_largest(numbers_list)

if second_largest is not None:

    print(second_largest,end="")

else:

    print("EMPTY") {codeBox}

Q2. Create a Python program that removes all duplicate positive integer numbers(includes zero) from a list and prints the unique numbers in the order they first appeared.The program should prompt the user to input a list of numbers, then process the list to remove duplicates and print the resulting list of unique numbers.

Input Format:
The input consists of a single list of numbers, separated by spaces.

Output Format:
The output consists of the unique numbers, separated by spaces, from the input list, in the order they first appeared.

Example:
Input:
3 1 4 1 5 9 2 6 5 3 5

Output:
3 1 4 5 9 2 6

Program Code: 

# Function to remove duplicates and preserve the order

def remove_duplicates(numbers):

    unique_numbers = []

    seen = set()

    

    for number in numbers:

        if number not in seen:

            unique_numbers.append(number)

            seen.add(number)

    

    return unique_numbers

# Main program

# Prompt the user to input a list of numbers, separated by spaces

input_numbers = input()

# Convert the input string to a list of integers

numbers_list = list(map(int, input_numbers.split()))

# Process the list to remove duplicates while preserving the order

unique_numbers = remove_duplicates(numbers_list)

# Print the unique numbers separated by spaces

print(" ".join(map(str, unique_numbers)), end="") {codeBox}

Q3. 

Create a Python program that takes a list of integers, reverses the list, adds the values at odd indices from both the original and reversed lists, and creates a new list with the result. The new list should be printed in the end.

Input Format:

The input consists of a single list of integers, separated by spaces.

Output Format:

The output consists of the new list of values, separated by spaces, obtained by adding values at odd indices from both the original and reversed lists.

Example:

Input:

1 2 3 4 5

Output:

1 6 3 6 5

Program Code: 

# Function to create a new list by adding values at odd indices

def add_odd_indices(original, reversed_list):

    result = []

    for i in range(len(original)):

        if i % 2 == 1:

            result.append(original[i] + reversed_list[i])

        else:

            result.append(original[i])

    return result

# Main program

# Prompt the user to input a list of integers, separated by spaces

input_numbers = input()

# Convert the input string to a list of integers

numbers_list = list(map(int, input_numbers.split()))

# Reverse the list

reversed_list = numbers_list[::-1]

# Create the new list by adding values at odd indices

new_list = add_odd_indices(numbers_list, reversed_list)

# Print the new list separated by spaces

print(" ".join(map(str, new_list)), end = "") {codeBox}

Conclusion

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