MCQs for Python Dictionaries: Exam-Style Practice

21

What is the purpose of the values() method for dictionaries?

A) Returns a list of all values in the dictionary B) Returns a list of all keys in the dictionary C) Returns a list of key-value pairs in the dictionary D) Returns a list of items in the dictionary

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

22

What will be the output of the following code:

my_dict = {'a': 1, 'b': 2}
my_dict['c'] = 3
print(my_dict)

A) {'a': 1, 'b': 2} B) {'a': 1, 'b': 2, 'c': 3} C) {'c': 3} D) None of the above

Discuss

Answer & Solution

Answer: Option B

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23

What is the output of the following code:

my_dict = {'a': 1, 'b': 2, 'c': 3}
my_dict.pop('b')
print(my_dict)

A) {'a': 1, 'b': 2, 'c': 3} B) {'a': 1, 'c': 3} C) {'a': 1, 'b': 2} D) {'c': 3}

Discuss

Answer & Solution

Answer: Option B

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24

What is the output of the following code:

my_dict = {'a': 1, 'b': 2, 'c': 3}
print(my_dict.get('d', 0))

A) 0 B) 'd' C) 3 D) 'a'

Discuss

Answer & Solution

Answer: Option A

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25

What is the output of the following code:

my_dict = {'a': 1, 'b': 2, 'c': 3}
my_dict.values()
print(my_dict)

A) {'a': 1, 'b': 2, 'c': 3} B) [1, 2, 3] C) {1, 2, 3} D) {'values': [1, 2, 3]}

Discuss

Answer & Solution

Answer: Option A

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26

What will be the output of the following code:

my_dict = {'a': 1, 'b': 2, 'c': 3}
my_dict.items()
print(my_dict)

A) {'a': 1, 'b': 2, 'c': 3} B) [('a', 1), ('b', 2), ('c', 3)] C) {('a': 1), ('b': 2), ('c': 3)} D) {'items': [('a', 1), ('b', 2), ('c', 3)]}

Discuss

Answer & Solution

Answer: Option A

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27

What is the output of the following code:

my_dict = {'a': 1, 'b': 2}
del my_dict['b']
print(my_dict)

A) {'a': 1, 'b': 2} B) {'a': 1} C) {'b': 2} D) {}

Discuss

Answer & Solution

Answer: Option B

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28

What is the output of the following code:

my_dict = {'a': 1, 'b': 2}
new_dict = my_dict.copy()
print(new_dict)

A) {'a': 1, 'b': 2} B) {'a': 1, 'b': 2, 'a': 1, 'b': 2} C) {'a': 1, 'b': 2, 'a': 2, 'b': 1} D) {'a': 2, 'b': 1}

Discuss

Answer & Solution

Answer: Option A

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29

What will be the output of the following code:

keys = ['a', 'b', 'c']
values = 0
my_dict = dict.fromkeys(keys, values)
print(my_dict)

A) {'a': 0, 'b': 0, 'c': 0} B) {'a': [0], 'b': [0], 'c': [0]} C) {0: ['a', 'b', 'c']} D) {'a': 'b', 'b': 'c', 'c': 0}

Discuss

Answer & Solution

Answer: Option A

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30

What is the output of the following code:

my_dict = {'a': 1, 'b': 2}
my_dict.popitem()
print(my_dict)

A) {'a': 1, 'b': 2} B) {} C) {'b': 2} D) {1: 'a', 2: 'b'}

Discuss

Answer & Solution

Answer: Option C

Solution:

Code Analysis:

my_dict = {'a': 1, 'b': 2}

1. popitem() Method: The popitem() method removes and returns the last inserted key-value pair. In this case, the last inserted pair is 'b': 2.

2. Updated Dictionary: After removing 'b': 2, the dictionary will contain only 'a': 1.

print(my_dict)

Output: The dictionary now contains {'a': 1}.

Incorrect Options:

A) {'a': 1, 'b': 2}: This would be the original dictionary, but popitem() modifies it.

B) {}: This would be true if both key-value pairs were removed, but only one is removed.

D) {1: 'a', 2: 'b'}: This is incorrect as keys and values are not swapped.

Thus, the correct answer is Option C: {'a': 1}.