Python Data Structure Exercise for Beginners

This data structure exercise is for beginners to understand and practice basic data structure in Python. Practice Python List, Set, Dictionary, and Tuple questions.

The data structure is widely used to hold any data. To perform any programming tasks in Python, good knowledge of data structure is a must.

Solve this exercise to have a good understanding of basic data structure in Python

This Exercise include the followings

• The exercise contains 10 questions and solution provided for each question
• Questions cover list manipulation, dictionary, set, and tuple methods.

Use Online Code Editor to solve exercise questions.

Exercise 1: Given two lists create a third list by picking an odd-index element from the first list and even index elements from the second.

Given:

listOne = [3, 6, 9, 12, 15, 18, 21]
listTwo = [4, 8, 12, 16, 20, 24, 28]

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]

listOne = [3, 6, 9, 12, 15, 18, 21]
listTwo = [4, 8, 12, 16, 20, 24, 28]
listThree = list()

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

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

print("Printing Final third list")
listThree.extend(oddElements)
listThree.extend(EvenElement)
print(listThree)

Exercise 2: Given a list, remove the element 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]

Expected Output:

Original list  [34, 54, 67, 89, 11, 43, 94]
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]

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

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

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

sampleList.append(element)
print("List after Adding element at last ", sampleList)

Exercise 3: Given a list slice it into 3 equal chunks and reverse each chunk

Given:

sampleList = [11, 45, 8, 23, 14, 12, 78, 45, 89]

Expected Outcome:

Original list  [11, 45, 8, 23, 14, 12, 78, 45, 89]
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]

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

length = len(sampleList)
chunkSize  = int(length/3)
start = 0
end = chunkSize
for i in range(1, 4, 1):
  indexes = slice(start, end, 1)
  listChunk = sampleList[indexes]
  print("Chunk ", i , listChunk)
  print("After reversing it ", list(reversed(listChunk)))
  start = end
  if(i != 2):
    end +=chunkSize
  else:
    end += length - chunkSize

Exercise 4: Iterate a given list and count the occurrence of each element and create a dictionary to show the count of each element

Expected Output:

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

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

countDict = dict()
for item in sampleList:
  if(item in countDict):
    countDict[item] += 1
  else:
    countDict[item] = 1
  
print("Printing count of each item  ",countDict)

Exercise 5: Given a two list of equal size create a Python set such that it shows the element from both lists in the pair

Expected Output:

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

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

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

result = zip(firstList, secondList)
resultSet = set(result)
print(resultSet)

Exercise 6: Given the following two sets find the intersection and remove those elements from the first set

Expected Output:

First Set  {65, 42, 78, 83, 23, 57, 29}
Second Set  {67, 73, 43, 48, 83, 57, 29}

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

firstSet  = {23, 42, 65, 57, 78, 83, 29}
secondSet = {57, 83, 29, 67, 73, 43, 48}

print("First Set ", firstSet)
print("Second Set ", secondSet)

intersection = firstSet.intersection(secondSet)
print("Intersection is ", intersection)
for item in intersection:
  firstSet.remove(item)

print("First Set after removing common element ", firstSet)

Exercise 7: Given two sets, Checks if One Set is a subset or superset of another Set. if the subset is found delete all elements from that set

Given:

firstSet = {27, 43, 34}
secondSet = {34, 93, 22, 27, 43, 53, 48}

Expected Output:

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

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}

firstSet  = {57, 83, 29}
secondSet = {57, 83, 29, 67, 73, 43, 48}

print("First Set ", firstSet)
print("Second Set ", secondSet)

print("First set is subset of second set -", firstSet.issubset(secondSet))
print("Second set is subset of First set - ", secondSet.issubset(firstSet))

print("First set is Super set of second set - ", firstSet.issuperset(secondSet))
print("Second set is Super set of First set - ", secondSet.issuperset(firstSet))

if(firstSet.issubset(secondSet)):
  firstSet.clear()
  
if(secondSet.issubset(firstSet)):
  secondSet.clear()

print("First Set ", firstSet)
print("Second Set ", secondSet)

Exercise 8: Iterate a given list and Check if a given element already exists in a dictionary as a key’s value if not delete it from the list

Given:

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

Expected Outcome:

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

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

print("List -", rollNumber)
print("Dictionary - ", sampleDict)

rollNumber[:] = [item for item in rollNumber if item in sampleDict.values()]
print("after removing unwanted elemnts from list ", rollNumber)

Exercise 9: Given a dictionary 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}

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())

speedList = list()
for item in speed.values():
  if item not in speedList:
    speedList.append(item)
print("unique list", speedList)

Exercise 10: Remove duplicate from a list and create a tuple and find the minimum and maximum number

Given:

sampleList = [87, 45, 41, 65, 94, 41, 99, 94]

Expected Outcome:

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

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

print("Original list", sampleList)

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

tuple = tuple(sampleList)
print("tuple ", tuple)

print("Minimum number is: ", min(tuple))
print("Maximum number is: ", max(tuple))