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Python | Get Unique values from list of dictionary

  • Last Updated : 26 Jul, 2019

Sometimes, while working with Python dictionaries, we can have a problem in which we need to find the unique values over all the dictionaries in a list. This kind of utility can occur in case while working with similar data and we wish to extract the unique ones. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using set() + values() + dictionary comprehension
The combination of these methods can together help us achieve the task of getting the unique values. The values function helps us get the values of dictionary, set helps us to get the unique of them, and dictionary comprehension to iterate through the list.

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# Python3 code to demonstrate working of
# Get Unique values from list of dictionary
# Using set() + values() + dictionary comprehension
  
# Initialize list 
test_list = [{'gfg' : 1, 'is' : 2}, {'best' : 1, 'for' : 3}, {'CS' : 2}]
  
# printing original list
print("The original list : " +  str(test_list))
  
# Using set() + values() + dictionary comprehension
# Get Unique values from list of dictionary
res = list(set(val for dic in test_list for val in dic.values()))
      
# printing result 
print("The unique values in list are : " + str(res))
Output :



The original list : [{‘gfg’: 1, ‘is’: 2}, {‘best’: 1, ‘for’: 3}, {‘CS’: 2}]
The unique values in list are : [1, 2, 3]

 

Method #2 : Using set() + values() + from_iterable()
The combination of above functions can be used to perform this particular task. It is just as the above method, but the iteration part is done by the from_iterable function.




# Python3 code to demonstrate working of
# Get Unique values from list of dictionary
# Using set() + values() + from_iterable()
from itertools import chain
  
# Initialize list 
test_list = [{'gfg' : 1, 'is' : 2}, {'best' : 1, 'for' : 3}, {'CS' : 2}]
  
# printing original list
print("The original list : " +  str(test_list))
  
# Using set() + values() + from_iterable()
# Get Unique values from list of dictionary
res = list(set(chain.from_iterable(sub.values() for sub in test_list)))
      
# printing result 
print("The unique values in list are : " + str(res))
Output :

The original list : [{‘gfg’: 1, ‘is’: 2}, {‘best’: 1, ‘for’: 3}, {‘CS’: 2}]
The unique values in list are : [1, 2, 3]




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