Python: Clear the list values within a given dictionary

Last update on June 28 2025 12:41:06 (UTC/GMT +8 hours)

50. Clear List Values in a Dictionary

A Python dictionary contains List as a value. Write a Python program to clear the list values in the said dictionary.

Visual Presentation:

Sample Solution:

Python Code:

# Define a function 'test' that clears the list values within a dictionary.
def test(dictionary):
    # Iterate through the keys in the 'dictionary' and use the 'clear' method to empty the lists.
    for key in dictionary:
        dictionary[key].clear()
    return dictionary

# Create a dictionary 'dictionary' with keys as 'C1', 'C2', and 'C3', and lists as values.
dictionary = { 
    'C1': [10, 20, 30], 
    'C2': [20, 30, 40],
    'C3': [12, 34]
}

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

# Print a message indicating the intention to clear the list values in the dictionary.
print("\nClear the list values in the said dictionary:")

# Call the 'test' function to clear the list values within the dictionary and print the resulting dictionary.
print(test(dictionary)) 

Sample Output:

Original Dictionary:
{'C1': [10, 20, 30], 'C2': [20, 30, 40], 'C3': [12, 34]}

Clear the list values in the said dictionary:
{'C1': [], 'C2': [], 'C3': []}

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to iterate over a dictionary and set each list value to an empty list using dictionary comprehension.
• Write a Python program to update a dictionary in-place by replacing each list with an empty list.
• Write a Python program to implement a function that returns a new dictionary with the same keys but empty lists as values.
• Write a Python program to use a loop to clear list values for each key in a given dictionary.

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