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Python – Remove duplicate values in dictionary
  • Last Updated : 08 May, 2020

Sometimes, while working with Python dictionaries, we can have problem in which we need to perform the removal of all the duplicate values of dictionary, and we are not concerned if any key get removed in the process. This kind of application can occur in school programming and day-day programming. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using loop
This is the brute force way in which we perform this task. In this, we keep track of occurred value, and remove it if it repeats.




# Python3 code to demonstrate working of 
# Remove duplicate values in dictionary
# Using loop
  
# initializing dictionary
test_dict = { 'gfg' : 10, 'is' : 15, 'best' : 20, 'for' : 10, 'geeks' : 20}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# Remove duplicate values in dictionary
# Using loop
temp = []
res = dict()
for key, val in test_dict.items():
    if val not in temp:
        temp.append(val)
        res[key] = val
  
# printing result 
print("The dictionary after values removal : " + str(res)) 
Output :

The original dictionary is : {‘gfg’: 10, ‘for’: 10, ‘geeks’: 20, ‘is’: 15, ‘best’: 20}
The dictionary after values removal : {‘gfg’: 10, ‘geeks’: 20, ‘is’: 15}

 



Method #2 : Using dictionary comprehension
The following problem can also be performed using dictionary comprehension. In this, we perform task in similar way as above method, just as a shorthand.




# Python3 code to demonstrate working of 
# Remove duplicate values in dictionary
# Using dictionary comprehension
  
# initializing dictionary
test_dict = { 'gfg' : 10, 'is' : 15, 'best' : 20, 'for' : 10, 'geeks' : 20}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# Remove duplicate values in dictionary
# Using dictionary comprehension
temp = {val : key for key, val in test_dict.items()}
res = {val : key for key, val in temp.items()}
  
# printing result 
print("The dictionary after values removal : " + str(res)) 
Output :

The original dictionary is : {‘gfg’: 10, ‘for’: 10, ‘geeks’: 20, ‘is’: 15, ‘best’: 20}
The dictionary after values removal : {‘gfg’: 10, ‘geeks’: 20, ‘is’: 15}

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