Python Data Structure Exercise for Beginners

This data structures exercise is designed for beginners to understand and practice fundamental data structures in Python. You’ll practice Python List, Set, Dictionary, and Tuple questions.

Data structures are crucial for organizing and holding data. To perform any programming task effectively in Python, a strong grasp of data structures is essential.

Solve this exercise to develop a solid understanding of basic data structures in Python.

This Exercise includes the followings: –

• This exercise includes 10 questions, each with a provided solution.
• The questions cover various methods for manipulating lists, dictionaries, sets, and tuples.
• Use an Online Code Editor to solve the exercises.

Exercise 1: List Creation using two lists

Write a code to create a new list using odd-indexed elements from the first list and even-indexed elements from the second

Given two lists, l1 and l2, write a program to create a third list l3 by picking an odd-index element from the list l1 and even index elements from the list l2.

Given:

l1 = [3, 6, 9, 12, 15, 18, 21]
l2 = [4, 8, 12, 16, 20, 24, 28]Code language: Python (python)

Expected Output:

Element at odd-index positions from list one
[6, 12, 18]
Element at even-index positions from list two
[4, 12, 20, 28]

Printing Final third list
[6, 12, 18, 4, 12, 20, 28]

list1 = [3, 6, 9, 12, 15, 18, 21]
list2 = [4, 8, 12, 16, 20, 24, 28]
res = list()

odd_elements = list1[1::2]
print("Element at odd-index positions from list one")
print(odd_elements)

even_elements = list2[0::2]
print("Element at even-index positions from list two")
print(even_elements)

print("Printing Final third list")
res.extend(odd_elements)
res.extend(even_elements)
print(res)Code language: Python (python)

Exercise 2: Remove and add item in a list

Write a program to remove the item present at index 4 and add it to the 2nd position and at the end of the list.

Given:

list1 = [54, 44, 27, 79, 91, 41]Code language: Python (python)

Expected Output:

List After removing element at index 4  [34, 54, 67, 89, 43, 94]
List after Adding element at index 2  [34, 54, 11, 67, 89, 43, 94]
List after Adding element at last  [34, 54, 11, 67, 89, 43, 94, 11]

sample_list = [34, 54, 67, 89, 11, 43, 94]

print("Original list ", sample_list)
element = sample_list.pop(4)
print("List After removing element at index 4 ", sample_list)

sample_list.insert(2, element)
print("List after Adding element at index 2 ", sample_list)

sample_list.append(element)
print("List after Adding element at last ", sample_list)Code language: Python (python)

Exercise 3: Slice list into 3 equal chunks and reverse each chunk

Given:

sample_list = [11, 45, 8, 23, 14, 12, 78, 45, 89]Code language: Python (python)

Expected Outcome:

Chunk  1 [11, 45, 8]
After reversing it  [8, 45, 11]
Chunk  2 [23, 14, 12]
After reversing it  [12, 14, 23]
Chunk  3 [78, 45, 89]
After reversing it  [89, 45, 78]

sample_list = [11, 45, 8, 23, 14, 12, 78, 45, 89]
print("Original list ", sample_list)

length = len(sample_list)
chunk_size = int(length / 3)
start = 0
end = chunk_size

# run loop 3 times
for i in range(3):
    # get indexes
    indexes = slice(start, end)
    
    # get chunk
    list_chunk = sample_list[indexes]
    print("Chunk ", i, list_chunk)
    
    # reverse chunk
    print("After reversing it ", list(reversed(list_chunk)))

    start = end
    end += chunk_sizeCode language: Python (python)

Exercise 4: Count the occurrence of each element from a list

Write a program to iterate a given list and count the occurrence of each element and create a dictionary to show the count of each element.

Given:

sample_list = [11, 45, 8, 11, 23, 45, 23, 45, 89]Code language: Python (python)

Expected Output:

Printing count of each item   {11: 2, 45: 3, 8: 1, 23: 2, 89: 1}

sample_list = [11, 45, 8, 11, 23, 45, 23, 45, 89]
print("Original list ", sample_list)

count_dict = dict()
for item in sample_list:
    if item in count_dict:
        count_dict[item] += 1
    else:
        count_dict[item] = 1

print("Printing count of each item  ", count_dict)Code language: Python (python)

Exercise 5: Paired Elements from Two Lists as a Set

Write a code to create a Python set such that it shows the element from both lists in a pair.

Given:

first_list = [2, 3, 4, 5, 6, 7, 8]
second_list = [4, 9, 16, 25, 36, 49, 64]Code language: Python (python)

Expected Output:

Result is  {(6, 36), (8, 64), (4, 16), (5, 25), (3, 9), (7, 49), (2, 4)}

first_list = [2, 3, 4, 5, 6, 7, 8]
print("First List ", first_list)

second_list = [4, 9, 16, 25, 36, 49, 64]
print("Second List ", second_list)

result = zip(first_list, second_list)
result_set = set(result)
print(result_set)Code language: Python (python)

Exercise 6: Set Intersection and Removal

Write a code to find the intersection (common) of two sets and remove those elements from the first set.

See: Python Set

Given:

first_set = {23, 42, 65, 57, 78, 83, 29}
second_set = {57, 83, 29, 67, 73, 43, 48}Code language: Python (python)

Expected Output:

Intersection is  {57, 83, 29}
First Set after removing common element  {65, 42, 78, 23}

first_set = {23, 42, 65, 57, 78, 83, 29}
second_set = {57, 83, 29, 67, 73, 43, 48}

print("First Set ", first_set)
print("Second Set ", second_set)

intersection = first_set.intersection(second_set)
print("Intersection is ", intersection)
for item in intersection:
    first_set.remove(item)

print("First Set after removing common element ", first_set)Code language: Python (python)

Exercise 7: Subset or Superset of another set

Write a code to checks if one set is a subset or superset of another set. If found, delete all elements from that set.

Given:

first_set = {27, 43, 34}
second_set = {34, 93, 22, 27, 43, 53, 48}Code language: Python (python)

Expected Output:

First set is subset of second set - True
Second set is subset of First set -  False

First set is Super set of second set -  False
Second set is Super set of First set -  True

First Set  set()
Second Set  {67, 73, 43, 48, 83, 57, 29}

first_set = {57, 83, 29}
second_set = {57, 83, 29, 67, 73, 43, 48}

print("First Set ", first_set)
print("Second Set ", second_set)

print("First set is subset of second set -", first_set.issubset(second_set))
print("Second set is subset of First set - ", second_set.issubset(first_set))

print("First set is Super set of second set - ", first_set.issuperset(second_set))
print("Second set is Super set of First set - ", second_set.issuperset(first_set))

if first_set.issubset(second_set):
    first_set.clear()

if second_set.issubset(first_set):
    second_set.clear()

print("First Set ", first_set)
print("Second Set ", second_set)Code language: Python (python)

Exercise 8: Filter List Against Dictionary Values

Write a program to iterate a given list and check if a given element exists as a key’s value in a dictionary. If not, delete it from the list

Given:

roll_number = [47, 64, 69, 37, 76, 83, 95, 97]
sample_dict = {'Jhon':47, 'Emma':69, 'Kelly':76, 'Jason':97}Code language: Python (python)

Expected Outcome:

After removing unwanted elements from list [47, 69, 76, 97]

roll_number = [47, 64, 69, 37, 76, 83, 95, 97]
sample_dict = {'Jhon': 47, 'Emma': 69, 'Kelly': 76, 'Jason': 97}

print("List:", roll_number)
print("Dictionary:", sample_dict)

# create new list
roll_number[:] = [item for item in roll_number if item in sample_dict.values()]
print("after removing unwanted elements from list:", roll_number)
Code language: Python (python)

Exercise 9: Extract Unique Dictionary Values to List

Write a code to get all values from the dictionary and add them to a list but don’t add duplicates

Given:

speed = {'jan': 47, 'feb': 52, 'march': 47, 'April': 44, 'May': 52, 'June': 53, 'july': 54, 'Aug': 44, 'Sept': 54}Code language: Python (python)

Expected Outcome:

[47, 52, 44, 53, 54]

speed = {'jan': 47, 'feb': 52, 'march': 47, 'April': 44, 'May': 52, 'June': 53,
         'july': 54, 'Aug': 44, 'Sept': 54}

print("Dictionary's values - ", speed.values())

speed_list = list()

# iterate dict values
for val in speed.values():
    # check if value not present in a list
    if val not in speed_list:
        speed_list.append(val)
print("unique list", speed_list)Code language: Python (python)

Exercise 10: remove duplicates from a list

Write a code to remove duplicates from a list and create a tuple and find the minimum and maximum number

Given:

sample_list = [87, 45, 41, 65, 94, 41, 99, 94]Code language: Python (python)

Expected Outcome:

unique items [87, 45, 41, 65, 99]
tuple (87, 45, 41, 65, 99)
min: 41
max: 99

sample_list = [87, 52, 44, 53, 54, 87, 52, 53]

print("Original list", sample_list)

sample_list = list(set(sample_list))
print("unique list", sample_list)

t = tuple(sample_list)
print("tuple ", t)

print("Minimum number is: ", min(t))
print("Maximum number is: ", max(t))Code language: Python (python)