1) One of the following 10 statements generates an error. Which one? (Your answer should be a number between 1 and 10.)
x = [1,"abcd",2,"efgh",[3,4]] # Statement 1
y = x[0:50] # Statement 2
z = y # Statement 3
w = x # Statement 4
x[1] = x[1][0:3] + 'd' # Statement 5
y[2] = 4 # Statement 6
z[0] = 0 # Statement 7
x[1][1:2] = 'yzw' # Statement 8
w[4][0] = 1000 # Statement 9
a = (x[4][1] == 4) # Statement 10
Answer : 8
Reason : Assignment like that is not allowed.
We can only use that syntax to get array from position a to b like x[a:b] but we cannot use assignment to it.
Invalid : x[1][1:2] = ‘yzw’.
2) Consider the following lines of Python code.
x = ['a',42,'b',377]
w = x[1:]
y = x
u = w
w = w[0:]
w[0] = 53
x[1] = 47
Which of the following is correct?
Answer : (a)
Answer : Self explanatory via basic list characteristics.
3) What is the value of second after executing the following lines?
first = "wombat"
second = ""
for i in range(len(first),0,-1):
second = first[i-1] + second
Answer : wombat
Reason: It is just looping from last character of “first” string and then appending every letter ahead of second string. Hence, this is what it looks like after each iteration of the loop:-
1 iteration : t
2 iteration : at
3 iteration : bat
4 iteration : mbat
5 iteration : ombat
6 iteration : wombat
Hence, answer is wombat.
4) What is the value of list1 after the following lines are executed?
def mystery(l):
l = l[2:5]
return()
list1 = [7,82,44,23,11]
mystery(list1)
Answer : [7,82,44,23,11]
Reason : mystery function doesn’t change the actual variable list1, it just changes the local variable ‘l’, so list1 remains unchanged. Hence, the answer is same as the orignal list1.
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