Python List Programs

In Python programming language, a list is a versatile and most used data type, it is just like a dynamically sized array. A list is used to store multiple items (of the same type as well as mixed type) in a single variable. Lists are created using the square brackets []. List items are indexed, ordered, changeable, and may contain duplicate values.

This section contains solved Python programs on Lists (like, creating lists, retrieving data from the lists, change the existing values of list items, removing the list items, etc.), practice these list programs to enhance the Python programming skills working on multiple values stored in a single variable. These programs contain the solved code, explanation, and output.

To get details about different data types visit mictechblog.blogspot. com

Program to print the elements of a list:

python

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def print_list(lst):

    for item in lst:

        print(item)

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

print_list(my_list)

Program to find the sum of all elements in a list:

python

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def sum_list(lst):

    sum = 0

    for item in lst:

        sum += item

    return sum

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

print("Sum of all elements:", sum_list(my_list))

Program to find the largest element in a list:

python

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def find_max(lst):

    max = lst[0]

    for item in lst:

        if item > max:

            max = item

    return max

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

print("Largest element:", find_max(my_list))

Program to sort a list in ascending order:

python

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def sort_list(lst):

    for i in range(len(lst)):

        for j in range(0, len(lst) - i - 1):

            if lst[j] > lst[j + 1]:

                lst[j], lst[j + 1] = lst[j + 1], lst[j]

    return lst

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

print("Sorted list:", sort_list(my_list))

Program to remove duplicates from a list:

python

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def remove_duplicates(lst):

    new_list = []

    for item in lst:

        if item not in new_list:

            new_list.append(item)

    return new_list

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

print("List without duplicates:", remove_duplicates(my_list))

Program to reverse a list:

python

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def reverse_list(lst):

    return lst[::-1]

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

print("Reversed list:", reverse_list(my_list))

Program to find the second largest element in a list:

python

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def second_largest(lst):

    max1 = lst[0]

    max2 = lst[1]

    for item in lst:

        if item > max1:

            max2 = max1

            max1 = item

        elif item > max2 and item != max1:

            max2 = item

    return max2

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

print("Second largest element:", second_largest(my_list))

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