Python List solved exercises……

In Python programming, lists are among the most versatile and powerful data structures at your disposal. If you’re on a journey to become a proficient Python developer, mastering lists is an essential milestone. Lists are ordered, mutable, and can store elements of different data types, making them a fundamental tool in your programming toolkit.

In this article, we’ll embark on a hands-on exploration of Python lists through a series of exercises.

So, buckle up and get ready to dive into the world of Python lists. Let’s turn theory into practice and elevate your Python programming prowess through engaging exercises that will not only hone your skills but also make learning a fun and rewarding experience.

1. Find the sum of elements in a list.

lst = [8,2,9,3,7]
print(sum(lst))

2. Write a Python program to find the largest and smallest element in a list.

lst = [8,2,9,3,7]
print('largest element: ',max(lst))
print('smallest element: ', min(lst))

3. Create a list of characters. Write a program to reverse the order of the elements in the list without using built-in functions. Use indexing method.

lst = ['A','P','B','Q','C','D']

rev=lst[::-1]
print(rev)

4. Write a Python program to find the index of an element in a list.

lst = ['A','P','B','Q','C','D']

print('Index of B: ', lst.index('B'))

5. Write a program to add item 7000 after 6000 in the following Python List

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

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

6. You have given a Python list. Write a program to find value 20 in the list, and if it is present, replace it with 200. Only update the first occurrence of an item.

list1 = [5, 10, 15, 20, 25, 50, 20]

Expected output: [5, 10, 15, 200, 25, 50, 20]

list1 = [5, 10, 15, 20, 25, 50, 20]

list1[list1.index(20)] = 200
print(list1)

7. Create a list of numbers. Write a program to find the range (difference between the largest and smallest element) of the list.

lst = [5, 10, 15, 200, 25, 50, 20]
r = max(lst) - min(lst)
print(r)

8. Write a Python program to find the frequency of each element in a list and store it in a dictionary.

lst = [6,3,98,24,3,5,74,1,5,6,3]
d={}
for i in set(lst):
  d.update({str(i):lst.count(i)})
print(d)

9. Create a list of numbers. Write a program to insert a new element at a specific position in the list.

lst = [5, 10, 15, 200, 25, 50, 20]

lst.insert(2,500)
print(lst)

10. Write a Python program to remove duplicates from a list.

lst = [6,3,98,24,3,5,74,1,5,6,3]
print('List without duplicates: ',list(set(lst)))

11. Remove empty strings from the list of strings without using any loops

list1 = ["Mike", "", "Emma", "Kelly", "", "Brad"]
list2 = list(filter(None,list1))
print(list2)

12. Write a Python program to find the common elements between two lists.

list_a = [1, 2, 3, 4, 5]
list_b = [3, 4, 5, 6, 7]

for i in list_a:
  if i in list_b:
    print(i)

13. Write a Python program to find the common elements between two lists without using loops.

list_a = [1, 2, 3, 4, 5]
list_b = [3, 4, 5, 6, 7]

common = list(set(list_a) & set(list_b))
print(common)

14. Write a Python program to find the second smallest element in a list.

lst = [3,6, 4, 5, 6, 7]
lst.sort()
print('second smallest element:', lst[1])

15. Write a Python program to check if a list is empty.

lst = []
if not bool(lst):
  print("list is empty")

16. Write a Python program to find the product of all elements in a list.

lst = [3,6, 4, 5, 6, 7]

product = 1
for i in lst:
  product *= i
print(product) 

17. Write a Python program to rotate a list to the right by n positions.

def rotate_list(lst, n):
    if n>len(lst):
      return "position is larger than the length of the list"
    else:
      return lst[-n:] + lst[:-n]
my_list = [1, 2, 3, 4, 5]
result = rotate_list(my_list, 3)
print(result)

18. Write a Python program to find the missing number in a list of consecutive numbers.

lst = [3,4,5,7,8,9,11]
for i in range(1,len(lst)-1):
  if lst[i+1]!=lst[i]+1:
    print(lst[i]+1)

19. Write a Python program to find the missing numbers in a list of continuous numbers.

lst = [3,4,7,8,9,11]
for i in range(1,len(lst)-1):
  p = lst[i]+1
  while lst[i+1]!=p:
    print(p)
    p +=1

20. Write a Python program to shuffle a list randomly.

import random
lst = [1, 2, 3, 4, 5]
random.shuffle(lst)
print(lst)

21. Write a Python program to find the length of the longest consecutive sequence of elements in a list.

my_list = [100, 4, 200, 1, 3, 2,9,11,12,10,15,13,16,14]
my_list.sort()
start=0
max_len =0
for i in range(0,len(my_list)-1):
  if my_list[i+1]!=my_list[i]+1:
    end=i
    length = len(my_list[start:end+1])
    max_len = max(length,max_len)
    start=i+1

print(max_len)

22. Write a Python program to find the longest consecutive sequence of elements in a list.

my_list = [100, 4, 200, 1, 3, 2,9,11,12,10,15,13,16,14]

my_list.sort()

start=0
max_len =0
for i in range(0,len(my_list)-1):
  if my_list[i+1]!=my_list[i]+1:
    end=i
    length = len(my_list[start:end+1])
    if length>max_len:
      max_len = length
      sub=my_list[start:end+1]
    start=i+1

print(sub)

23. Write a Python program to find the longest increasing subsequence from a given list of numbers.

my_list = [10, 22, 9, 33, 21,35, 50, 41, 60, 80]

s=0
e=0
ma=0
for i in range(1,len(my_list)):
  if my_list[i] < my_list[i-1]:
    e=i
    sub = my_list[s:e]
    length = len(sub)
    if length>ma:
      ma=length
      lsub=sub
    s=i

  if i==len(my_list)-1:
      e=i+1
      sub = my_list[s:e]
      length = len(sub)

      if length>ma:
        ma=length
        lsub=sub

print(ma)
print(lsub)

24. Write a Python program to find the longest increasing subsequence from a given list of numbers.

def longest_increasing_subsequence(lst):
    n = len(lst)
    lis = [1] * n

    for i in range(1, n):
        for j in range(0, i):
            if lst[i] > lst[j] and lis[i] < lis[j] + 1:
                lis[i] = lis[j] + 1
    return max(lis)

# Example usage:
my_list = [10, 22, 9, 33, 21, 50, 41, 60, 80]
result = longest_increasing_subsequence(my_list)
print(result)

25. Write a Python program to split a list for a given number of lists.

my_list = [100, 4, 200, 1, 3, 2,9,11,23,35,12,10,15,13,16,14]
n=3
length = len(my_list)
size = length//n

start=0
k=0
while k<n:
  print(my_list[start:size])
  start=size
  size=size+size
  k+=1

26. Write a Python program to split a list into chunks of a given size.

my_list = [100, 4, 200, 1, 3, 2,9,11,23,35,12,10,15,13,16,14]

size=3
length = len(my_list)

p = [my_list[i: i+size] for i in range(0,length,size)]
print(p)

27. Write a Python program to find the median of a list.

my_list = [100,4,200,1,3,2,9,11,23,35,12,10,15,13,16,14]
my_list.sort()

length = len(my_list)
if len(my_list)%2!=0:
  med = my_list[(length//2)]
else:
  med = (my_list[length//2]+my_list[(length//2)-1])/2

print(med)

28. Write a Python program to remove the elements at even indices from a list.

mylist = [100,4,200,1,3,2,9,11,23,35,12,10,15,13,16,14,0]

output=[mylist[i] for i in range(1,len(mylist),2)]
print(output)

29. Write a Python program to find the sum of elements at odd indices in a list.

mylist = [100,4,200,1,3,2,9,11,23,35,12,10,15,13,16,14,0]
total = mylist[1::2]
print(total)

30. Write a Python program to find the common elements among three lists.

list_a = [1, 2, 3, 4, 5]
list_b = [3, 4, 5, 6, 7]
list_c = [5, 6, 7, 8, 9,4]

common=list(set(list_a) & set(list_b) & set(list_c))
print(common)

31. Write a Python program to find the k smallest elements in a list.

mylist = [100,4,200,1,3,2,9,11,23,35,12,10,15,13,16,14,0]
k=3
mylist.sort()
print(f"{k}th smallest element: ",mylist[k-1])

32. Write a Python program to check if a list is a palindrome.

palindrome_list = [1, 2, 3, 2, 1]

if palindrome_list==palindrome_list[::-1]:
    print("Palindrom")
else:
    print("Not Palindrom")

33. Write a Python program to find the largest product of two distinct elements in a list.

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

my_list.sort()

p_max = my_list[-1] * my_list[-2]
print(p_max)

34. Write a Python program to find the index of the first occurrence of an element in a list without using the built-in index function.

my_list = [6,3,98,24,3,5,74,1,5,6,3]
e = 3

for index,value in enumerate(my_list):
  if value==e:
    print(index)
    break

35. Write a Python program to find the difference between consecutive elements in a list.

my_list = [6,3,98,24,3,5,74,1,5,6,3]

diff_list=[]

for i in range(1,len(my_list)):
   d = my_list[i-1]-my_list[i]
   diff_list.append(d)

print(diff_list)

Congratulations! You’ve just completed a journey through a series of Python list exercises, and by now, you should feel more confident in your ability to manipulate and harness the power of lists in your Python programs. From the basics of list creation to more advanced operations, you’ve sharpened your skills and gained valuable insights into effective list management. Keep exploring, keep coding, and most importantly, keep enjoying the journey of becoming a Pythonista. Happy coding!

If you are newbee to python, You can Check my previous post here:

• Tkinter Tutorial
• Python Tutorials
• Virtual Environments
• Numpy Tutorials
• Statistics
• Python String Exercises