test_merge.py

from distutils.debug import DEBUG
from pickle import TRUE
import json
import os
import collections
from collections import defaultdict

DEBUG = TRUE

dict_1 = {'John': 15, 'Rick': {10,15}, 'Misa': 12}
dict_2 = {'Bonnie': 18, 'Rick': {15,20}, 'Matt': 16}
dict_3 = {'Klay': 22, 'Rick': {20,21}, 'Scot': 33}

def mergeDictionary(dict_1, dict_2,dict_3):
    dicts = [dict_1, dict_2, dict_3]
    result = dict()
    result = defaultdict(set)     
    for d in dicts: 
        for k, v in d.items(): 
            if isinstance(v ,set):
                result[k].add(tuple(v)) 
            if type(v) is dict:
                result[k].add(tuple(v))  
            if type(v) is list:
                result[k].add(tuple(v))  
            if isinstance(v,int): 
                result[k].add(v)                                                          
    return result        

print(mergeDictionary(dict_1,dict_2,dict_3))