Python Program: Counter operations - Union, intersection, and difference
4. Counter Union/Intersection/Difference
Write a Python program that creates two 'Counter' objects and finds their union, intersection, and difference.
Sample Solution:
Code:
from collections import Counter
# Create two Counter objects
ctr1 = Counter(x=3, y=2, z=10)
ctr2 = Counter(x=1, y=2, z=3)
# Union of counters
union_counter = ctr1 + ctr2
print("Union Counter:", union_counter)
# Intersection of counters
intersection_counter = ctr1 & ctr2
print("\nIntersection Counter:", intersection_counter)
# Difference of counters
difference_counter = ctr1 - ctr2
print("\nDifference Counter:", difference_counter)
Output:
Union Counter: Counter({'z': 13, 'x': 4, 'y': 4})
Intersection Counter: Counter({'z': 3, 'y': 2, 'x': 1})
Difference Counter: Counter({'z': 7, 'x': 2})
In the exercise above, two "Counter" objects 'ctr1' and 'ctr2' are created with different key-value pairs. The union operation '+' adds up the counts of the common keys in both counters. The intersection operation '&' keeps the minimum count of common keys. The difference operation '-' subtracts the count of keys in the second counter from the first counter. Finally each case's results are printed.
Flowchart:
For more Practice: Solve these Related Problems:
- Write a Python program to create two Counter objects from two lists and then compute their union, intersection, and difference, printing each result.
- Write a Python function to merge two Counters by taking the maximum count for each key and print the merged Counter.
- Write a Python script to calculate the intersection of two Counter objects by summing the minimum counts for each key and output the result.
- Write a Python program to compute the difference between two Counters such that only counts exceeding the second are retained, and display the final Counter.
Python Code Editor :
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