PCEP Certification Practice: Iterating through Dictionaries and their Keys and Values

Question 1: Which method is used to iterate over the keys of a dictionary?

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

Question 2: Which of the following methods can be used to iterate through the values of a dictionary? (Choose all that apply)

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

Question 3: Complete the code to iterate over the keys of the dictionary my_dict.

my_dict = {'a': 1, 'b': 2, 'c': 3}
for ______ in my_dict:
    print(______ )

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

my_dict = {'name': 'Alice', 'age': 30}
for key in my_dict:
    print(key)

1. name Alice age 30
2. Alice 30
3. name age
4. None

Question 5: Insert the correct method to iterate over both keys and values of the dictionary person.

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

Question 6: What will be the result of the following code?

person = {'name': 'Bob', 'age': 25}
for key in person.keys():
    print(person[key])

1. name age
2. Bob 25
3. ('name', 'age')
4. None

Question 7: Which of the following loops correctly iterate over both keys and values of a dictionary? (Choose all that apply)

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

Question 8: Arrange the steps to correctly iterate over the values of a dictionary and print each one.

1. Print each value.
2. Use the values() method to get a view object of the values.
3. Iterate over the dictionary values using a for loop.

Question 9: Complete the code to print both the keys and values of the dictionary my_dict.

my_dict = {'x': 10, 'y': 20, 'z': 30}
for ______, ______ in my_dict.items():
    print(______, ______)

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

my_dict = {'apple': 1, 'banana': 2, 'cherry': 3}
for fruit in my_dict:
    print(fruit, my_dict[fruit])

1. apple 1 banana 2 cherry 3
2. 1 2 3
3. apple banana cherry
4. None

Question 11: Insert the correct method to iterate over the values of the dictionary scores.

scores = {'math': 90, 'science': 85, 'english': 88}
for score in scores.______():
    print(score)

Question 12: What does the following code do?

my_dict = {'a': 1, 'b': 2, 'c': 3}
for key, value in my_dict.items():
    if value == 2:
        print(key)

1. Prints b
2. Prints 2
3. Prints None
4. Prints a b c

Question 13: Which of the following statements correctly iterate over the dictionary data and print both keys and values? (Choose all that apply)

1. for k, v in data.items(): print(k, v)
2. for k in data.keys(): print(k, data[k])
3. for v in data.values(): print(v)
4. for item in data: print(item)

Question 14: Arrange the steps to find and print all keys in a dictionary that have a value greater than 50.

1. Use an if statement to check if the value is greater than 50.
2. Iterate over the key-value pairs using items().
3. Print the key if the condition is met.

Question 15: Complete the code to iterate over a dictionary data and print all keys that have a value of True.

data = {'a': True, 'b': False, 'c': True}
for key, value in data.items():
    if ______:
        print(key)

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

my_dict = {'x': 100, 'y': 200, 'z': 300}
for k in my_dict:
    print(k, end=", ")

1. x, y, z,
2. 100, 200, 300,
3. x y z
4. None

17. Insert the correct method to iterate over both keys and values of the dictionary info.

info = {'name': 'Alice', 'age': 30}
for key, value in info.______():
    print(key, ":", value)

Question 18: What does the following code do?

scores = {'math': 95, 'science': 90, 'history': 85}
for subject in scores:
    print(scores[subject])

1. Prints math science history
2. Prints 95 90 85
3. Prints subject
4. Prints None

Question 19: Which of the following are correct ways to iterate over the keys of a dictionary? (Choose all that apply)

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

Question 20: Arrange the steps to correctly iterate over the values in a dictionary and find the maximum value.

1. Initialize a variable to hold the maximum value.
2. Update the maximum value if the current value is greater.
3. Iterate over the values using the values() method.

Question 21: Complete the code to print the sum of all values in the dictionary numbers.

numbers = {'a': 1, 'b': 2, 'c': 3}
total = 0
for value in numbers.______():
    total += value
print(total)

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

data = {'x': 10, 'y': 20, 'z': 30}
for k, v in data.items():
    if v > 15:
        print(k)

1. x y
2. y z
3. 10 20 30
4. None

Question 23: Insert the correct code to print both the keys and values of the dictionary my_dict.

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

Question 24: What happens if you try to iterate over a dictionary using for key, value in my_dict without using items()?

1. Both keys and values are iterated over.
2. Only the keys are iterated over, and a ValueError is raised.
3. A TypeError is raised.
4. The code runs without error but only iterates over the keys.

Question 25: Which of the following methods can be used to access both keys and values in a dictionary during iteration? (Choose all that apply)

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