Question 7 - Teachoo Sample Paper - Computer Science Class 12 - Solutions to CBSE Sample Paper - Computer Science Class 12

What will be the output of the following code?

D1 = {‘name’: ‘Alice’, ‘age’: 20, ‘gender’: ‘F’} 

D2 = D1.popitem() 

print(D1) 

print(D2)

1. {‘name’: ‘Alice’, ‘age’: 20} (‘gender’, ‘F’) 

2. {‘name’: ‘Alice’, ‘gender’: ‘F’} (‘age’, 20) 

3. {‘age’: 20, ‘gender’: ‘F’} (‘name’, ‘Alice’)

4. Error

Answer:

Answer by student

a. {‘name’: ‘Alice’, ‘age’: 20} (‘gender’, ‘F’)

Detailed answer by teachoo

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

• D1 = {‘name’: ‘Alice’, ‘age’: 20, ‘gender’: ‘F’} : This creates a dictionary named D1 with three key-value pairs: (‘name’, ‘Alice’), (‘age’, 20), and (‘gender’, ‘F’). The keys are strings and the values are either strings or integers. 
• D2 = D1.popitem() : This calls the popitem() method on the dictionary D1 and assigns its return value to a variable named D2. The popitem() method removes and returns the last inserted item from the dictionary as a tuple. A tuple is another data structure that stores multiple values in an ordered and immutable way. In this case, the last inserted item is (‘gender’, ‘F’), so it is removed from D1 and returned as D2. The value of D2 is now (‘gender’, ‘F’).
• print(D1) : This prints the value of D1 to the output. The print() function prints the values of variables or expressions to the output. The value of D1 is now {‘name’: ‘Alice’, ‘age’: 20}, as the item (‘gender’, ‘F’) has been removed by the popitem() method.
• print(D2) : This prints the value of D2 to the output. The value of D2 is (‘gender’, ‘F’), as it is the return value of the popitem() method.

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

• a. {‘name’: ‘Alice’, ‘age’: 20} (‘gender’, ‘F’) : This is the correct option, as it matches the output of the code. The print() function prints the values of D1 and D2 to the output, which are {‘name’: ‘Alice’, ‘age’: 20} and (‘gender’, ‘F’) respectively.
• b. {‘name’: ‘Alice’, ‘gender’: ‘F’} (‘age’, 20) : This is incorrect , as it does not match the output of the code. The popitem() method does not remove a random item, but the last inserted item. In this case, the last inserted item is (‘gender’, ‘F’), not (‘age’, 20).
• c. {‘age’: 20, ‘gender’: ‘F’} (‘name’, ‘Alice’) : This is incorrect , as it does not match the output of the code. The popitem() method does not remove the first inserted item, but the last inserted item. In this case, the last inserted item is (‘gender’, ‘F’), not (‘name’, ‘Alice’).
• d. Error : This is incorrect , as the code does not produce any error. The popitem() method works on any non-empty dictionary and does not require any parameters.

So, the correct answer is a. {‘name’: ‘Alice’, ‘age’: 20} (‘gender’, ‘F’)

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