Python List Interview Coding Question Pratice With Solution

Whether you’re preparing for a job interview or simply looking to sharpen your Python skills, this resource is designed to help you master list-related coding challenges commonly encountered in interviews. Throughout this practice exercise, you’ll find a series of Python coding questions focused on lists, along with detailed solutions to guide you through the problem-solving process. By working through these exercises, you’ll gain confidence in tackling list-related problems, enhance your problem-solving abilities, and solidify your understanding of Python programming concepts. Let’s dive in and start practicing!. Try Our python editor to solve the question. Editor are available in every questions tab. Don’t try to copy before try it by yourself.

Exercise 1: Concatenate two lists index-wise

Write an python program to add two lists index-wise. Create new list that contain 0th index item from the both list, then the 1st item and so on till the last element. Any left item will be added in the last of new list.

list1 = ["M", "na", "i", "Ro"]
list2 = ["y", "me", "s", "nny"]

['My', 'name', 'is', 'Ronny']

def con(lst1, lst2):
    
    if len(lst1) == len(lst2):
        new_list = []
        iterate = len(lst1)
        for i in range(iterate):
            new_list.append(lst1[i]+lst2[i])
        return new_list
    else:
        return "Lists must have the same length"


list1 = ["M", "na", "i", "Ro"]
list2 = ["y", "me", "s", "nny"]

print(con(list1, list2))

Exercise 2: Reverse a list in Python

Write an Python programm to reverse all of list’s item. Do not try to copy the code, before do it by your own after check the solution.

list1 = [10, 9, 8, 7, 6]

[6, 7, 8, 9, 10]

def reverse_a_list(lst):
    new_list = []
    length_of_list = len(lst)
    for i in range(length_of_list):
        new_list.append(lst[length_of_list-1-i])
    return new_list

list1 = [10, 9, 8, 7, 6]
print(reverse_a_list(list1))

Exercise 3: Concatenate two lists in the following order

Write an program to concatenate two lists in a order.

list1 = ["Hello ", "GoodMorning "]
list2 = ["Ram", "Bhawna"]

['Hello Ram', 'Hello Bhawna', 'GoodMorning Ram', 'GoodMorning Bhawna']

def concatinate_two_list(lst1, lst2):
    new_list = []
    for i in lst1:
        for j in lst2:
            new_list.append(i + j)
    return new_list




list1 = ["Hello ", "GoodMorning "]
list2 = ["Ram", "Bhawna"]

print(concatinate_two_list(list1, list2))

Exercise 4: Turn every item of a list into its square

Write an program to square of item of a given list.

numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]

[1, 4, 9, 16, 25, 36, 49, 64, 81]

def square_number(lst):
    new_list = []
    for i in lst:
        new_list.append(i*i)
    return new_list


numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]
print(square_number(numbers))

Exercise 5: Remove empty strings from the list of strings

Write an program to remove empty string.

list1 = ["Mahi", "", "Bhawna", "Kabir", "", "Gandhi"]

['Mahi', 'Bhawna', 'Kabir', 'Gandhi']

def remove_empty(lst):
    new_list = []
    for i in lst:
        if i != "":
            new_list.append(i)
    return new_list

list1 = ["Mahi", "", "Bhawna", "Kabir", "", "Gandhi"]

print(remove_empty(list1))

Exercise 6: Iterate both lists simultaneously

Write an program to print items ony by one from both of the list in parallel.

list1 = [1, 2, 3, 4]
list2 = [10, 20, 30, 40]

1 40
2 30
3 20
4 10

def iterator(lst1, lst2):
    if len(lst1) == len(lst2):
        for i in range(len(lst1)):
            print(lst1[i], lst2[len(lst2)-i-1])

list1 = [1, 2, 3, 4]
list2 = [10, 20, 30, 40]

iterator(list1, list2)

Exercise 7: Extend nested list by adding the sublist

Write an program to add an list to another list at specific location.

list1 = ["A", "B", ["C", ["D", "E", ["F", "G"], "K"], "L"], "M", "N"]

# sub list to add
sub_list = ["H", "I", "J"]

['A', 'B', ['C', ['D', 'E', ['F', 'G', 'H', 'I', 'J'], 'K'], 'L'], 'M', 'N']

list1 = ["A", "B", ["C", ["D", "E", ["F", "G"], "K"], "L"], "M", "N"]

# sub list to add
sub_list = ["H", "I", "J"]


list1[2][1][2].extend(sub_list)

print(list1)

Exercise 8: Add new item to list after a specified item

Write an program to add item in a list at specified location.

list1 = [10, 20, [300, 400, [5000, 6000], 500], 30, 40]

[10, 20, [300, 400, [5000, 6000, 7000], 500], 30, 40]

list1 = [10, 20, [300, 400, [5000, 6000], 500], 30, 40]


list1[2][2].append(7000)
print(list1)

Exercise 9: Remove all occurrences from a list.

Write an program to remove all item that present more than one times. Remove the duplication.

list1 = [5, 20, 15, 20, 25, 50, 20]

[5, 20, 15, 25, 50]

def remove_occurence(lst):
    new_list = []
    for i in lst:
        if i not in new_list:
            new_list.append(i)
    return new_list


list1 = [5, 20, 15, 20, 25, 50, 20]
print(remove_occurence(list1))

Exercise 10: Replace list’s item with new value if found

Write an program to replace item from the list.

list1 = [10, 9, 8, 7, 6]

[6, 7, 8, 9, 10]

def replace(lst, old_number, new_number):
    new_list = []
    for i in lst:
        if i != old_number:
            new_list.append(i)
        else:
            new_list.append(new_number)
    return new_list
    
list1 = [10, 9, 8, 7, 6]
print(replace(list1, 7, 10))