Python - Frequency of unequal items in Dictionary

Python – Frequency of unequal items in Dictionary

Last Updated : 17 Dec, 2019

Sometimes, while working with Python, we can come across a problem in which we need to check for the unequal items count among two dictionaries. This has an application in cases of web development and other domains as well. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using dictionary comprehension
This particular task can be performed in one line using dictionary comprehension which offers a way of compacting lengthy brute logic and just checks for unequal items and increments count.

# Python3 code to demonstrate working of
# Dissimilar items frequency in Dictionary
# Using dictionary comprehension
  
# initializing dictionaries
test_dict1 = {'gfg' : 1, 'is' : 2, 'best' : 3}
test_dict2 = {'gfg' : 1, 'is' : 2, 'good' : 3}
  
# printing original dictionaries
print("The original dictionary 1 is : " + str(test_dict1))
print("The original dictionary 2 is : " + str(test_dict2))
  
# Dissimilar items frequency in Dictionary
# Using dictionary comprehension
res = {key: test_dict1[key] for key in test_dict1 if key not in test_dict2}
  
# printing result
print("The number of uncommon items are : " + str(len(res)))

Output :

The original dictionary 1 is : {'best': 3, 'is': 2, 'gfg': 1}
The original dictionary 2 is : {'good': 3, 'is': 2, 'gfg': 1}
The number of uncommon items are : 1

Method #2 : Using set() + XOR operator + items()
The combination of above methods can be used to perform this particular task. In this, the set function removes duplicates and XOR operator computes the matched items. Result can be computed by subtracting original dict. length by new dict. length.

# Python3 code to demonstrate working of
# Dissimilar items frequency in Dictionary
# Using set() + XOR operator + items()
  
# initializing dictionaries
test_dict1 = {'gfg' : 1, 'is' : 2, 'best' : 3}
test_dict2 = {'gfg' : 1, 'is' : 2, 'good' : 3}
  
# printing original dictionaries
print("The original dictionary 1 is : " + str(test_dict1))
print("The original dictionary 2 is : " + str(test_dict2))
  
# Dissimilar items frequency in Dictionary
# Using set() + XOR operator + items()
res = set(test_dict1.items()) ^ set(test_dict2.items())
  
# printing result
print("The number of uncommon items are : " + str(len(test_dict1) - len(res)))

Output :

The original dictionary 1 is : {'best': 3, 'is': 2, 'gfg': 1}
The original dictionary 2 is : {'good': 3, 'is': 2, 'gfg': 1}
The number of uncommon items are : 1

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