Programming, Data Structures And Algorithms Using Python - Assignment 2 | NPTEL | [Jan 2023]

Programming, Data Structures And Algorithms Using Python - Assignment 2 | NPTEL | Answer with Explanation

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One of the following 10 statements generates an error. Which one? (Your answer should be a number between 1 and 10.)

x = ["sun",[17],2,"king",[3,4]] # Statement 1
y = x[0:8] # Statement 2
z = x # Statement 3
w = y # Statement 4
z[0] = 0 # Statement 5
y[0] = y[0][0:3] + 'k' # Statement 6
y[1][1:3] = [5,8] # Statement 7
x[0] = x[0][1:3] # Statement 8
w[4][0] = 1000 # Statement 9
a = (x[4][1] == 4) # Statement 10

Answer

8.
Error:
Traceback (most recent call last):
File "", line 15, in
TypeError: 'int' object is not subscriptable

x = ["sun",[17],2,"king",[3,4]] # Statement 1
print(x)
y = x[0:8] # Statement 2
print(y)
z = x # Statement 3
print(z)
w = y # Statement 4
print(w)
z[0] = 0 # Statement 5
print(z)
y[0] = y[0][0:3] + 'k' # Statement 6
print(y)
y[1][1:3] = [5,8] # Statement 7
print(y)
x[0] = x[0][1:3] # Statement 8
print(x)
w[4][0] = 1000 # Statement 9
print(w)
a = (x[4][1] == 4) # Statement 10
print(a)

Output:
['sun', [17], 2, 'king', [3, 4]]
['sun', [17], 2, 'king', [3, 4]]
['sun', [17], 2, 'king', [3, 4]]
['sun', [17], 2, 'king', [3, 4]]
[0, [17], 2, 'king', [3, 4]]
['sunk', [17], 2, 'king', [3, 4]]
['sunk', [17, 5, 8], 2, 'king', [3, 4]]
Traceback (most recent call last):
File "", line 15, in
TypeError: 'int' object is not subscriptable

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After these execute, which of the following is correct?

a. x[2] == 487, y[0] == 397, u[2] == 487, w[0] == 357
b. x[2] == 487, y[0] == 357, u[2] == 487, w[0] == 357
c. x[2] == 487, y[0] == 397, u[2] == 397, w[0] == 357
d. x[2] == 487, y[0] == 357, u[2] == 397, w[0] == 357

Answer

a. x[2] == 487, y[0] == 397, u[2] == 487, w[0] == 357


x = [589,'big',397,'bash']
print("x:",x)
y = x[2:]
print("y:",y)
u = x
print("u:",u)
w = y
print("w:", w)
w = w[0:]
print("w:", w)
w[0] = 357
print("w:", w)
x[2:3] = [487]
print("x:",x)
print(x[2],y[0],u[2],w[0] )

Output:
x: [589, 'big', 397, 'bash']
y: [397, 'bash']
u: [589, 'big', 397, 'bash']
w: [397, 'bash']
w: [397, 'bash']
w: [357, 'bash']
x: [589, 'big', 487, 'bash']
487 397 487 357

Lst[ Initial : End : IndexJump ]

What is the value of second after executing the following lines?

first = "kaleidoscope"
second = ""
for i in range(len(first)-1,-1,-2):
second = first[i]+second

Answer

aedsoe
Syntax: range(start, stop, step)

first = "kaleidoscope"
second = ""
for i in range(len(first)-1,-1,-2):
second = first[i]+second
print(second)

Output:
aedsoe

What is the value of list1 after the following lines are executed?

def mystery(l):
l[0:2] = l[3:5]
return()
list1 = [34,17,12,88,53,97,62]
mystery(list1)

Answer

[88, 53, 12, 88, 53, 97, 62]

def mystery(l):
l[0:2] = l[3:5]
return()
list1 = [34,17,12,88,53,97,62]
print(list1[0:2])
print(list1[3:5])
mystery(list1)
print(list1)
Output:
[34, 17]
[88, 53]
[88, 53, 12, 88, 53, 97, 62]

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Programming, Data Structures And Algorithms Using Python,NPTEL ,,Assignment 2 [Jan 2023],noc23_cs15

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