Python | Extract specific keys from dictionary

We have a lot of variations and applications of dictionary container in Python and sometimes, we wish to perform a filter of keys in dictionary, i.e extracting just the keys which are present in particular container. Let’s discuss certain ways in which this can be performed.

Method #1 : Using dictionary comprehension + items()

This problem can be performed by reconstruction using the keys extracted through items function that wish to be filtered and dictionary function makes the desired dictionary.



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# Python3 code to demonstrate
# Extracting specifix keys from dictionary
# Using dictionary comprehension + items()
  
# initializing dictionary
test_dict = {'nikhil' : 1, "akash" : 2, 'akshat' : 3, 'manjeet' : 4}
  
# printing original list
print("The original dictionary : " + str(test_dict))
  
# Using dictionary comprehension + items()
# Extracting specifix keys from dictionary
res = {key: test_dict[key] for key in test_dict.keys()
                               & {'akshat', 'nikhil'}}
  
# print result
print("The filtered dictionary is : " + str(res))

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Output :          


The original dictionary : {'manjeet': 4, 'akshat': 3, 'akash': 2, 'nikhil': 1}
The filtered dictionary is : {'akshat': 3, 'nikhil': 1}





 


Method #2 : Using dict()


The dict function can be used to perform this task by converting the logic performed using list comprehension into a dictionary.











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# Python3 code to demonstrate 


# Extracting specifix keys from dictionary 


# Using dict() 


  


# initializing dictionary 


test_dict = {'nikhil' : 1, "akash" : 2, 'akshat' : 3, 'manjeet' : 4} 


  


# printing original list 


print("The original dictionary : " + str(test_dict)) 


  


# Using dict() 


# Extracting specifix keys from dictionary 


res = dict((k, test_dict[k]) for k in ['nikhil', 'akshat'] 


                                        if k in test_dict) 


  


# print result 


print("The filtered dictionary is : " + str(res)) 



















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Output :          


The original dictionary : {'manjeet': 4, 'akshat': 3, 'akash': 2, 'nikhil': 1}
The filtered dictionary is : {'akshat': 3, 'nikhil': 1}






          
          
          

          

    

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