Question 9 - Teachoo Sample Paper - Computer Science Class 12 - Solutions to CBSE Sample Paper - Computer Science Class 12

Which of the following statement(s) would give an error during execution of the following code?

tup = (10, 20, 30, 40, 50)

print(len(tup)) #Statement 1

print(tuple(tup)) #Statement 2

print(tup.count(20)) #Statement 3

print(tup.append(60)) #Statement 4

Options:

A) Statement 1 

B) Statement 2 

C) Statement 3 

D) Statement 4

Answer:

Answer by student

D) Statement 4

Detailed answer by teachoo

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Let’s look at each line of the code and see what it does.

• tup = (10, 20, 30, 40, 50) : This creates a tuple named tup with five values: 10, 20, 30, 40, and 50. The tuple has a fixed length of five and cannot be modified once created.
• print(len(tup)) #Statement 1 : This prints the length of the tuple tup to the output. The len() function returns the number of items in a sequence, such as a tuple. The length of tup is 5, so it prints 5 to the output.
• print(tuple(tup)) #Statement 2 : This prints the tuple tup to the output. The tuple() function converts an iterable to a tuple. In this case, the iterable is already a tuple, so it returns the same tuple without any change. It prints (10, 20, 30, 40, 50) to the output.
• print(tup.count(20)) #Statement 3 : This prints the number of times the value 20 appears in the tuple tup to the output. The count() method returns the number of occurrences of a specified value in a tuple. In this case, the value is 20, which appears once in tup, so it prints 1 to the output.
• print(tup.append(60)) #Statement 4 : This tries to append the value 60 to the end of the tuple tup and print its return value to the output. The append() method adds an item to the end of a list. However, tuples are immutable , which means they cannot be changed or modified once created. Therefore, tuples do not have an append() method and trying to call it will raise an AttributeError .

Let’s look at each of the options and see why they are correct or incorrect.

• A) Statement 1 : This is incorrect , as it does not give an error during execution. The len() function works on any sequence, including tuples, and returns its length without any problem.
• B) Statement 2 : This is incorrect , as it does not give an error during execution. The tuple() function works on any iterable, including tuples, and returns a tuple without any problem.
• C) Statement 3 : This is incorrect , as it does not give an error during execution. The count() method works on any tuple and returns the number of occurrences of a specified value without any problem.
• D) Statement 4 : This is the correct option, as it gives an error during execution. The append() method does not work on tuples, as they are immutable and cannot be changed or modified once created. Trying to call it will raise an AttributeError.

So, the correct answer is D) Statement 4.

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