Python: Filter even numbers from a given dictionary values

Last update on March 27 2025 12:56:59 (UTC/GMT +8 hours)

57. Filter Even Numbers from Dictionary Values

Write a Python program to filter even numbers from a dictionary of values.

Visual Presentation:

Sample Solution:

Python Code:

# Define a function 'test' that filters even numbers from dictionary values.
def test(dictt):
    # Use a dictionary comprehension to filter even numbers for each value in the dictionary.
    result = {key: [idx for idx in val if not idx % 2] for key, val in dictt.items()}   
    return result    

# Create a dictionary 'students' with string keys (class names) and lists of integers as values.
students = {'V' : [1, 4, 6, 10], 'VI' : [1, 4, 12], 'VII' : [1, 3, 8]} 

# Print a message indicating the start of the code section and the dictionary being processed.
print("\nOriginal Dictionary:")
print(students)

# Call the 'test' function to filter even numbers from dictionary values and print the result.
print("Filter even numbers from said dictionary values:")
print(test(students))

# Create another dictionary 'students' with string keys (class names) and lists of integers as values.
students = {'V' : [1, 3, 5], 'VI' : [1, 5], 'VII' : [2, 7, 9]} 

# Print a message indicating the start of the code section and the new dictionary being processed.
print("\nOriginal Dictionary:")
print(students)

# Call the 'test' function to filter even numbers from dictionary values and print the result.
print("Filter even numbers from said dictionary values:")
print(test(students)) 

Sample Output:

Original Dictionary:
{'V': [1, 4, 6, 10], 'VI': [1, 4, 12], 'VII': [1, 3, 8]}
Filter even numbers from said dictionary values:
{'V': [4, 6, 10], 'VI': [4, 12], 'VII': [8]}

Original Dictionary:
{'V': [1, 3, 5], 'VI': [1, 5], 'VII': [2, 7, 9]}
Filter even numbers from said dictionary values:
{'V': [], 'VI': [], 'VII': [2]}

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to update a dictionary by filtering each list value to include only even numbers using dictionary comprehension.
• Write a Python program to iterate over a dictionary and create a new dictionary with list values containing only even integers.
• Write a Python program to implement a function that processes a dictionary with lists and returns a dictionary of even numbers only.
• Write a Python program to use a for-loop to filter out odd numbers from each list value in a dictionary.

Python Code Editor:

Previous: Write a Python program to convert a given dictionary into a list of lists.
Next: Write a Python program to get all combinations of key-value pairs in a given dictionary.