Python List & Tuple MCQs

Question 11: What will be the output of the following code?

x = [x for x in range(10) if x <5] print(x)

Answer: D

Above, [x for x in range(10) if x<5] returns a new list using the list comprehension. First, it executes the for loop for x in range(10). The element x will be returned if the specified condition if x<5 evaluates to True. If the condition evaluates to True, then the expression before for loop would be executed and stored in the new list. Here, expression x simply stores the value of x into a new list.

Question 12: What will be the output of the following code?

lst = [1, 2, 3, 4, 5]
del lst[:]
print(lst)

Answer: B

Question 13: What will be the output of the following code?

lst = [1, 2, 3, 4, 5]
print(lst[0:1]

Answer: B

lst[0:1] returns 1 element from 0 index.

The range slice operator [FromIndex : Untill Index - 1] fetches items in the range specified by the two index operands separated by : symbol. If the first operand is omitted, the range starts from the index 0. If the second operand is omitted, the range goes up to the end of the list. Visit list operators for more information.

Question 14: What will be the output of the following code?

lst = [1, 2, 3, 4, 5]
print(lst[-5:-3])

Answer: A

lst[-5,-3] returns two elements from -5 index until -3. List supports negative indexing where the first element's negative index = -(total number of element). Above, -5 index returns 1 and -3 index returns 3.

The range slice operator [FromIndex : Untill Index - 1] fetches items in the range specified by the two index operands separated by : symbol. If the first operand is omitted, the range starts from the index 0. If the second operand is omitted, the range goes up to the end of the list. Visit list operators for more information.

Question 15: What will be the output of the following code?

lst = [1, 2, 3]
lst[:]=[4,5,6]
print(lst)

Answer: B

lst[:]=[4,5,6] replaces all the elements of the list.

Question 16: What will be output of the following expression:

n= max('ten', 10, 10.00)
Print(n)

Answer: B

If a tuple object contains strings as well as numeric items, the max() and min() functions throw a TypeError. Learn tuple.

Question 17: Which of following will result in error?

Answer: D

The Tuple() function can have only one argument. Learn tuple.

Question 18: What will be the output of the following code?

names = ('Jeff', 'Bill', 'Steve', 'Yash') 
a, b, c, d = names 
print("Hello", a)

Answer: A

Above, a, b, c, d = names unpacks the tuple and assign the first element to a, second to b, and so on. Learn tuple.

Question 19: Which of the following methods cannot be used with tuple?

Answer : B

A tuple is an immutable object, once created, it cannot be modified. Hence it is not possible to insert.

Learn tuple.