Python Sample Papers: Data Structure

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Question 1: Two lists are given here. So, Create a third list by picking an odd-index element from the first list and even index elements from second?


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

Expected Outcome: [6, 12, 18, 4, 12, 20, 28]


Solution
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 odd-index positions from list two")
print(EvenElement)

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

Output

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

Question 2: In a given list delete the value at index 3 and insert it at 2nd and last position?


testList = [8, 17, 67, 89, 11, 43, 55]

print("Org. list ", testList)
val = testList.pop(3)
print("Updated List after removing no. at pos. 3 ", testList)

testList.insert(2, val)
print("Now add it at ind. 2 ", testList)

testList.append(val)
print("After Add at last ", tsetList)

>>>
Org. list [8, 17, 67, 89, 11, 43, 55]
Updated List after removing no. at pos. 3 [8, 17, 67, 11, 43, 55]
Now add it at ind. 2 [8, 17, 89, 67, 11, 43, 55]
After Addition at last [8, 17, 89, 67, 11, 43, 55, 89]

Question 3: split a list into a 3 equal parts and reverse each one?



       Lst1 = [56, 27, 8, 91, 44, 12, 19, 27, 63]
print("Org. ", Lst1)

ln = len(Lst1)
spSize = int(ln/3)
st = 0
end = spSize
for i in range(1, 4, 1):
	ind = slice(st, end, 1)
	tmpL= Lst1[ind]
	print("Part ", i , tmpL)
	print("Reversed ", list(reversed(tmpL)))
	st = end
	if(i != 2):
		end +=spSize
	else:
		end += ln - spSize

>>>
Initial: [56, 27, 8, 91, 44, 12, 19, 27, 63]
Part 1 [56, 27, 8]
Reversed [8, 27, 56]
Part 2 [91, 44, 12]
Reversed [12, 44, 91]
Part 3 [19, 27, 63]
Reversed [63, 27, 19]

Question 4: In a Given a list count the occurrence of every data and make a dictionary to display the count of each data?


Ex: list = [14, 20, 88, 14, 20, 38, 20]
o/p = {14: 2, 20: 3, 88: 1, 38: 1}


tList = [14, 20, 88, 14, 20, 38, 20]
print("list ", tList)

cntDict = dict()
for i in tList:
	if(i in cntDict):
		cntDict[i] += 1
	else:
		cntDict[i] = 1

print("Count Detail ",cntDict)

>>>
list [14, 20, 88, 14, 20, 38, 20]
Count Detail {14: 2, 20: 3, 88: 1, 38: 1}

Question 5: from a two list of equal size generate a set which shows the data from both lists in the pair?


Ex: 
fList = [11, 12, 13, 14, 15]
sList = [55, 66, 77, 88, 99]
Exp. o/p = {(11, 55), (12, 66), (13, 77), (14, 88), (15, 99)}


L1 = [2, 4, 6, 8]
print("List 1 : ", L1)

L2 = [4, 8, 12, 16]
print("List 2 : ", L2)

L3 = zip(L1, L2)
res_Set = set(L3)
print("o/p is :",res_Set)

>>>
List 1 : [2, 4, 6, 8]
List 2 : [4, 8, 12, 16]
o/p is :{(2, 4), (4, 8), (6, 12), (8, 16)}

Question 6: find intersection from two sets and delete those values from the first set?


Ex:
st1 = {12, 11, 40 , 70, 18}
st2 = {10, 18, 12 , 40, 55}
Exp. o/p: st1 = {11, 40, 70}


F_Set = {32, 42, 51, 57, 40, 79, 33}
S_Set = {57, 79, 33, 67, 73, 43, 48}

print("First  ", F_Set)
print("Second  ", S_Set)

x = F_Set.intersection(S_Set)
print("Intersection set ", x)
for i in x:
	F_Set.remove(i)

print("First Set after deleting common numbers ", F_Set)

>>>
First {51, 42, 40, 79, 32, 57, 33}
Second {67, 73, 43, 48, 79, 57, 33}

Intersection set {57, 79, 33}
First Set after deleting common numbers {51, 42, 40, 32}

Question 7: In two sets, Check if One is Subset or superset of Another. if subset is found remove all values from that set?


Ex:
Set_A = {27, 43, 34}
Set_B = {34, 93, 22, 27, 43, 53, 48}
o/p:
A is sub set of B
Set_A = {}


Set_A = {57, 83, 29}
Set_B = {57, 83, 29, 67, 73, 43, 48}

print("A ", Set_A)
print("B ", Set_B)

print("A is subset of B -", Set_A.issubset(Set_B))
print("B is subset of A - ", Set_B.issubset(Set_A))

print("A is Super set of B - ", Set_A.issuperset(Set_B))
print("B is Super set of A - ", Set_B.issuperset(Set_A))

if(Set_A.issubset(Set_B)):
Set_A.clear()

if(Set_B.issubset(Set_A)):
Set_B.clear()

print("A : ", Set_A)
print("B : ", Set_B)

>>>
A {57, 83, 29}
B {67, 73, 43, 48, 83, 57, 29}

A is subset of B - True
B is subset of A - False

A is Super set of B - False
B is Super set of A - True

A : set()
B : {67, 73, 43, 48, 83, 57, 29}

Question 8: remove element from a list which are not in a dictionary as a key’s value?


Given:
EmpID = [55, 83, 69, 94, 22, 83, 30, 97]
empDict ={'Ajay':55, 'shruti':69, 'Iti':22, 'Sunil':97}
Exp. o/p:
after deleting unmatched data : [55, 69, 22, 97]


EmpID = [55, 83, 69, 94, 22, 83, 30, 97]
empDict ={'Karan':55, 'shruti':69, 'Iti':22, 'Sunil':97} 

print("List -", EmpID)
print("Dictionary - ", empDict)

EmpID[:] = [i for i in EmpID if i in empDict.values()]
print("Updated list ", EmpID)

>>>
List - [55, 83, 69, 94, 22, 83, 30, 97]
Dictionary - {'Karan': 55, 'shruti': 69, 'Iti': 22, 'Sunil': 97}
[55, 69, 22, 97]
Updated list [55, 69, 22, 97]

Question 9:Add all values from a dictionary to a list which are not repeated?


Given:
sale ={'jan':80, 'feb':31, 'mar':81, 'Apr':42, 'May':31, 'Jun':47, 'Jul':73, 'Aug':42, 'Sep':73}
Expected Outcome: [80, 81, 47]


sale ={'jan':80, 'feb':31, 'mar':81, 'Apr':42, 'May':31, 'Jun':47,
'Jul':73, 'Aug':42, 'Sep':73} 

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

saleList = list()
for val in sale.values():
	if val not in saleList:
		saleList.append(val)
print("Final :", saleList)

>>>
Dictionary's values - dict_values([80, 31, 81, 42, 31, 47, 73, 42, 73])
final : [80, 81, 47]

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


Ex: 
Lst1 = [32, 40, 88, 53, 54, 32, 40, 53]
Expected Outcome: 
unique items [88, 40, 53, 54, 32]
tuple (88, 40, 53, 54, 32)
min: 32
max: 88


Lst1 = [32, 40, 88, 53, 54, 32, 40, 53]

print("Org: ", Lst1)

Lst1 = list(set(Lst1))
print("unique list", Lst1)

tuple = tuple(Lst1)
print("tuple ", tuple)

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

>>>
Org: [32, 40, 88, 53, 54, 32, 40, 53]
unique list [88, 40, 53, 54, 32]
tuple (88, 40, 53, 54, 32)
Minimum : 32
Maximum : 88

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Question 1: Two lists are given here. So, Create a third list by picking an odd-index element from the first list and even index elements from second?
`For Example: listOne = [3, 6, 9, 12, 15, 18, 21] listTwo = [4, 8, 12, 16, 20, 24, 28] Expected Outcome: [6, 12, 18, 4, 12, 20, 28]`

Solution

Output

Question 2: In a given list delete the value at index 3 and insert it at 2nd and last position?

Question 3: split a list into a 3 equal parts and reverse each one?

Question 4: In a Given a list count the occurrence of every data and make a dictionary to display the count of each data?
`Ex: list = [14, 20, 88, 14, 20, 38, 20] o/p = {14: 2, 20: 3, 88: 1, 38: 1}`

Question 5: from a two list of equal size generate a set which shows the data from both lists in the pair?
`Ex: fList = [11, 12, 13, 14, 15] sList = [55, 66, 77, 88, 99] Exp. o/p = {(11, 55), (12, 66), (13, 77), (14, 88), (15, 99)}`

Question 6: find intersection from two sets and delete those values from the first set?
`Ex: st1 = {12, 11, 40 , 70, 18} st2 = {10, 18, 12 , 40, 55} Exp. o/p: st1 = {11, 40, 70}`

Question 7: In two sets, Check if One is Subset or superset of Another. if subset is found remove all values from that set?
`Ex: Set_A = {27, 43, 34} Set_B = {34, 93, 22, 27, 43, 53, 48} o/p: A is sub set of B Set_A = {}`

Question 8: remove element from a list which are not in a dictionary as a key’s value?
`Given: EmpID = [55, 83, 69, 94, 22, 83, 30, 97] empDict ={'Ajay':55, 'shruti':69, 'Iti':22, 'Sunil':97} Exp. o/p: after deleting unmatched data : [55, 69, 22, 97]`

Question 9:Add all values from a dictionary to a list which are not repeated?
`Given: sale ={'jan':80, 'feb':31, 'mar':81, 'Apr':42, 'May':31, 'Jun':47, 'Jul':73, 'Aug':42, 'Sep':73} Expected Outcome: [80, 81, 47]`

Question 10: Remove duplicate from a list and create a tuple and find the minimum and maximum number?
`Ex: Lst1 = [32, 40, 88, 53, 54, 32, 40, 53] Expected Outcome: unique items [88, 40, 53, 54, 32] tuple (88, 40, 53, 54, 32) min: 32 max: 88`

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