Python Program: Updating item counts using Counter objects

Last update on December 21 2024 07:29:15 (UTC/GMT +8 hours)

Write a Python program that creates a 'Counter' for a list of items and uses dictionary-style access to update the count of specific items.

Sample Solution:

Code:

from collections import Counter

def main():
    items = ['Red', 'Green', 'Black', 'Black', 'Red', 'Red', 'Orange', 'Pink', 'Pink', 'Red', 'White']
    
    # Create a Counter for the list of items
    counter = Counter(items)
    
    print("Original Counter:")
    print(counter)
    
    # Update the count of specific items using dictionary-style access
    counter['Red'] += 2
    counter['Orange'] -= 1
    
    print("\nUpdated Counter:")
    print(counter)

if __name__ == "__main__":
    main()

Output:

Original Counter:
Counter({'Red': 4, 'Black': 2, 'Pink': 2, 'Green': 1, 'Orange': 1, 'White': 1})

Updated Counter:
Counter({'Red': 6, 'Black': 2, 'Pink': 2, 'Green': 1, 'White': 1, 'Orange': 0})

In the exercise above, the "Counter" is first created for the list of items. The count of specific items is then updated using dictionary-style access, where we provide the item as the key and the new count as the value. In order to show the changes in the counts after updating, the modified "Counter" is printed.

Flowchart:

Previous: Python Program: Calculate Jaccard Similarity Coefficient.