PCEP Certification Practice: Dictionary Methods keys(), items(), and values()

Question 1: What does the keys() method return when called on a dictionary?

1. A list of all the values in the dictionary.
2. A view object of all the keys in the dictionary.
3. A list of key-value pairs in the dictionary.
4. A copy of the dictionary.

Question 2: Which of the following statements correctly describe the items() method in a dictionary? (Choose all that apply)

1. It returns a list of all the keys in the dictionary.
2. It returns a view object of key-value pairs.
3. Each element in the view object returned is a tuple.
4. It allows both keys and values to be accessed simultaneously.

Question 3: Complete the code to retrieve a view object of all the values in the dictionary my_dict.

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

Question 4: What will be the output of the following code?

my_dict = {'x': 10, 'y': 20, 'z': 30}
print(list(my_dict.keys()))

1. ['x', 'y', 'z']
2. [(10, 20, 30)]
3. [10, 20, 30]
4. [('x', 10), ('y', 20), ('z', 30)]

Question 5: Insert the correct method to print all key-value pairs of the dictionary person as tuples.

person = {'name': 'Alice', 'age': 30}
for item in person.______():
    print(item)

Question 6: What does the following code output?

info = {'course': 'Python', 'level': 'beginner'}
for value in info.values():
    print(value)

1. Python beginner
2. course level
3. ('course', 'Python') ('level', 'beginner')
4. None

Question 7: Which of the following methods can be used to iterate through a dictionary to access both its keys and values? (Choose all that apply)

1. my_dict.keys()
2. my_dict.values()
3. my_dict.items()
4. for key, value in my_dict.items():

Question 8: Arrange the steps to correctly retrieve and print all keys from the dictionary data.

1. Convert the view object to a list.
2. Use the keys() method to get the keys.
3. Print the list of keys.

Question 9: Complete the code to get a list of all key-value pairs in the dictionary settings.

settings = {'theme': 'dark', 'volume': 'medium'}
pairs = list(settings.______)
print(pairs)

Question 10: What will be the output of the following code?

fruits = {'apple': 3, 'banana': 5, 'cherry': 7}
for fruit in fruits.keys():
    print(fruit)

1. 3 5 7
2. apple banana cherry
3. apple: 3 banana: 5 cherry: 7
4. None

Question 11: Insert the correct method to print only the values from the dictionary inventory.

inventory = {'pens': 10, 'notebooks': 5, 'erasers': 15}
print(list(inventory.______()))

Question 12: What is the result of the following code?

contact = {'email': '[email protected]', 'phone': '123-456-7890'}
print(contact.items())

1. ['email', '[email protected]', 'phone', '123-456-7890']
2. ['email', 'phone']
3. dict_items([('email', '[email protected]'), ('phone', '123-456-7890')])
4. None

Question 13: Which of the following statements correctly describe the values() method? (Choose all that apply)

1. It returns all the values in the dictionary.
2. It returns a view object.
3. It returns a list of tuples.
4. It can be used in a loop to iterate over the values.

Question 14: Arrange the steps to correctly iterate through a dictionary and print both keys and values.

1. Use the items() method.
2. Iterate over the key-value pairs using a for loop.
3. Print each key-value pair.

Question 15: Complete the code to print all values from the dictionary data.

data = {'name': 'Alice', 'age': 30, 'city': 'New York'}
for value in data.______():
    print(value)

Question 16: What will be the output of the following code?

car = {'make': 'Toyota', 'model': 'Corolla', 'year': 2020}
for key, value in car.items():
    print(f"{key}: {value}")

1. ('make', 'Toyota') ('model', 'Corolla') ('year', 2020)
2. make: Toyota model: Corolla year: 2020
3. make model year
4. None

17. Insert the correct method to retrieve only the keys from the dictionary scores.

scores = {'math': 95, 'science': 90, 'history': 85}
keys = scores.______()
print(list(keys))

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

menu = {'burger': 5, 'fries': 2, 'soda': 1}
for item in menu.items():
    print(item)

1. burger 5 fries 2 soda 1
2. ('burger', 5) ('fries', 2) ('soda', 1)
3. menu.keys()
4. menu.items()

Question 19: Which of the following are correct ways to iterate through a dictionary and access its keys or values? (Choose all that apply)

• for key in my_dict.keys():
• for value in my_dict.values():
• for key, value in my_dict.items():
• for item in my_dict.keys_values():

Question 20: Arrange the steps to retrieve and print all the values from the dictionary contacts.

1. Use the values() method.
2. Convert the view object to a list.
3. Print the list of values.

Question 21: Complete the code to retrieve and print both keys and values from the dictionary library.

library = {'book': 'Python 101', 'author': 'John Doe'}
for ______, ______ in library.items():
    print(______, ______)

Question 22: What will be the output of the following code?

devices = {'laptop': 1000, 'phone': 800, 'tablet': 600}
print(list(devices.values()))

1. [1000, 800, 600]
2. laptop phone tablet
3. {'laptop': 1000, 'phone': 800, 'tablet': 600}
4. [('laptop', 1000), ('phone', 800), ('tablet', 600)]

Question 23: Insert the correct method to retrieve all the key-value pairs from the dictionary preferences.

preferences = {'theme': 'dark', 'notifications': True}
items = preferences.______()
print(list(items))

Question 24: What will be the result of the following code?

grades = {'math': 'A', 'science': 'B', 'history': 'A'}
keys_list = list(grades.keys())
print(keys_list)

1. ['math', 'science', 'history']
2. ['A', 'B', 'A']
3. ('math', 'science', 'history')
4. None

Question 25: Which of the following methods return a view object from a dictionary? (Choose all that apply)

1. keys()
2. values()
3. items()
4. get()