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.
# 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.
# 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)) |
chevron_right
filter_none
Output :
The original dictionary : {'manjeet': 4, 'akshat': 3, 'akash': 2, 'nikhil': 1}
The filtered dictionary is : {'akshat': 3, 'nikhil': 1}
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