When it is required to find duplicate sets in a list of sets, the ‘Counter’ and ‘frozenset’ are used.
Example
Below is a demonstration of the same
from collections import Counter
my_list = [{4, 8, 6, 1}, {6, 4, 1, 8}, {1, 2, 6, 2}, {1, 4, 2}, {7, 8, 9}]
print("The list is :")
print(my_list)
my_freq = Counter(frozenset(sub) for sub in my_list)
my_result = []
for key, value in my_freq.items():
if value > 1 :
my_result.append(key)
print("The result is :")
print(my_result)Output
The list is :
[{8, 1, 4, 6}, {8, 1, 4, 6}, {1, 2, 6}, {1, 2, 4}, {8, 9, 7}]
The result is :
[frozenset({8, 1, 4, 6})]Explanation
A list of set values is defined and is displayed on the console.
It is iterated over using the ‘frozenset’ and ‘Counter’.
This gives the frequency of every value in the list.
This is assigned to a variable.
An empty list is created.
The elements of the variable are iterated over and if the frequency is greater than 1, this is appended to the empty list.
This is displayed as output on the console.