Python Questions and Answers – Lists

Programming

October 21, 2024
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614 words

Python Multiple Choice Questions & Answers (MCQs) focuses on “Lists-6”.

Q 1. What will be the output of the following Python code?

a=[10,23,56,[78]]
b=list(a)
a[3][0]=95
a[1]=34
print(b)

A. [10,34,56,[78]]

B. [10,23,56,[95]]

C. [10,23,56,[78]]

D. [10,34,56,[95]]

Show Answer

Answer:-B. [10,23,56,[95]]

Explanation

The above copy is a type of shallow copy and only changes made in sublist is reflected in the copied list.

Q 2. What will be the output of the following Python code?

print(list(zip((1,2,3),('a'),('xxx','yyy'))))
print(list(zip((2,4),('b','c'),('yy','xx'))))

A. [(1,2,3),(‘a’),(‘xxx’,’yyy’)] [(2,4),(‘b’,’c’),(‘yy’,’xx’)]

B. [(1, ‘a’, ‘xxx’),(2,’ ‘,’yyy’),(3,’ ‘,’ ‘)] [(2, ‘b’, ‘yy’), (4, ‘c’, ‘xx’)]

C. [(1, ‘a’, ‘xxx’)] [(2, ‘b’, ‘yy’), (4, ‘c’, ‘xx’)]

D. Syntax error

Show Answer

Answer:-C. [(1, ‘a’, ‘xxx’)] [(2, ‘b’, ‘yy’), (4, ‘c’, ‘xx’)]

Explanation

The zip function combines the individual attributes of the lists into a list of tuples.

Q 3. What will be the output of the following Python code?

import copy
a=[10,23,56,[78]]
b=copy.deepcopy(a)
a[3][0]=95
a[1]=34
print(b)

A. [10,34,56,[95]]

B. [10,23,56,[78]]

C. [10,23,56,[95]]

D. [10,34,56,[78]]

Show Answer

Answer:-B. [10,23,56,[78]]

Explanation

The above copy is deepcopy. Any change made in the original list isn’t reflected.

Q 4. What will be the output of the following Python code?

s="a@b@c@d"
a=list(s.partition("@"))
print(a)
b=list(s.split("@",3))
print(b)

A. [‘a’,’b’,’c’,’d’] [‘a’,’b’,’c’,’d’]

B. [‘a’,’@’,’b’,’@’,’c’,’@’,’d’] [‘a’,’b’,’c’,’d’]

C. [‘a’,’@’,’b@c@d’] [‘a’,’b’,’c’,’d’]

D. [‘a’,’@’,’b@c@d’] [‘a’,’@’,’b’,’@’,’c’,’@’,’d’]

Show Answer

Answer:-C. [‘a’,’@’,’b@c@d’] [‘a’,’b’,’c’,’d’]

Explanation

The partition function only splits for the first parameter along with the separator while split function splits for the number of times given in the second argument but without the separator.

Q 5. What will be the output of the following Python code?

a=[1,2,3,4]
b=[sum(a[0:x+1]) for x in range(0,len(a))]
print(b)

A. 10

B. [1,3,5,7]

C. 4

D.[1,3,6,10]

Show Answer

Answer:-D.[1,3,6,10]

Explanation

The above code returns the cumulative sum of elements in a list.

Q 6. What will be the output of the following Python code?

a="hello"
b=list((x.upper(),len(x)) for x in a)
print(b)

A. [(‘H’, 1), (‘E’, 1), (‘L’, 1), (‘L’, 1), (‘O’, 1)]

B. [(‘HELLO’, 5)]

C.[(‘H’, 5), (‘E’, 5), (‘L’, 5), (‘L’, 5), (‘O’, 5)]

D. Syntax error

Show Answer

Answer:-A. [(‘H’, 1), (‘E’, 1), (‘L’, 1), (‘L’, 1), (‘O’, 1)]

Explanation

Variable x iterates over each letter in string a hence the length of each letter is 1.

Q 7. What will be the output of the following Python code?

a=[1,2,3,4]
b=[sum(a[0:x+1]) for x in range(0,len(a))]
print(b)

A. [1,3,6,1]

B.[1,3,5,7]

C.[1,3,6,9]

D.[1,3,6,10]

Show Answer

Answer:-C. [1,3,6,10]

Explanation

The above code returns the cumulative sum of elements in a list.

Q 8. What will be the output of the following Python code?

a=[[]]*3
a[1].append(7)
print(a)

A. Syntax error

B.[[7], [7], [7]]

C. [[7], [], []]

D.[[],7, [], []]

Show Answer

Answer:-B. [[7], [7], [7]]

Explanation

The first line of the code creates multiple reference copies of sublist. Hence when 7 is appended, it gets appended to all the sublists.

Q 9. What will be the output of the following Python code?

b=[2,3,4,5]
a=list(filter(lambda x:x%2,b))
print(a)

A.[2,4]

B. [3,5]

C. [ ]

D. Invalid arguments for filter function

Show Answer

Answer:-B. [3,5]

Explanation

The filter function gives value from the list b for which the condition is true, that is, x%2==1.

Q 10. What will be the output of the following Python code?

lst=[3,4,6,1,2]
lst[1:2]=[7,8]
print(lst)

A. [3,4,6,7,8]

B. [3, 7, 8, 6, 1, 2]

C. [3,[7,8],6,1,2]

D. Syntax error

Show Answer

Answer:-B. [3, 7, 8, 6, 1, 2]

Explanation

In the piece of code, slice assignment has been implemented. The sliced list is replaced by the assigned elements in the list. Type in python shell to verify.