Sometimes, while working with records, we can have a problem in which we need to perform the removal of a key from nested dictionary whose value us specific to K. This is a common problem and has its application in data domains such as web development. Lets discuss certain ways in which this task can be performed.
Input : test_dict = {‘CS’: {‘priceless’: 6}, ‘is’: {‘better’: 6}, ‘gfg’: {‘best’: 6}}
Output : {‘CS’: {}, ‘gfg’: {}, ‘is’: {}}Input : test_dict = {‘CS’: {‘priceless’: 9}, ‘is’: {‘better’: 8}, ‘gfg’: {‘best’: 7}}
Output : {‘CS’: {‘priceless’: 9}, ‘is’: {‘better’: 8}, ‘gfg’: {‘best’: 7}}
Method #1 : Using loop + isinstance() + filter()
The combination of above functions can be used to solve this problem. In this, we perform the task of K value using filter() and isinstance() is used to test for nesting dictionary. The dictionary construction is done using loop.
# Python3 code to demonstrate working of # Remove K valued key from Nested Dictionary # Using loop + isinstance() + filter() # initializing dictionary test_dict = { 'gfg' : { 'best' : 4 , 'good' : 5 }, 'is' : { 'better' : 6 , 'educational' : 4 }, 'CS' : { 'priceless' : 6 }} # printing original dictionary print ( "The original dictionary : " + str (test_dict)) # initializing rem_val rem_val = 6 # Remove K valued key from Nested Dictionary # Using loop + isinstance() + filter() def rem_vals(ele): global rem_val key, val = ele return val ! = rem_val res = dict () for key, val in test_dict.items(): if isinstance (val, dict ): res[key] = dict ( filter (rem_vals, val.items())) else : res[key] = val # printing result print ( "Dictionary after removal : " + str (res)) |
The original dictionary : {‘is’: {‘educational’: 4, ‘better’: 6}, ‘gfg’: {‘best’: 4, ‘good’: 5}, ‘CS’: {‘priceless’: 6}}
Dictionary after removal : {‘is’: {‘educational’: 4}, ‘gfg’: {‘best’: 4, ‘good’: 5}, ‘CS’: {}}
Method #2 : Using dictionary comprehension + isinstance()
+ lamda
The combination of above functionalities can be used to perform this task in one liner using lambda function.
# Python3 code to demonstrate working of # Remove K valued key from Nested Dictionary # Using dictionary comprehension + isinstance() + lamda # initializing dictionary test_dict = { 'gfg' : { 'best' : 4 , 'good' : 5 }, 'is' : { 'better' : 6 , 'educational' : 4 }, 'CS' : { 'priceless' : 6 }} # printing original dictionary print ( "The original dictionary : " + str (test_dict)) # initializing rem_val rem_val = 6 # Remove K valued key from Nested Dictionary # Using dictionary comprehension + isinstance() + lamda fnc = lambda sub: { key1: fnc(val1) if isinstance (val1, dict ) else val1 for key1, val1 in sub.items() if val1 ! = rem_val} res = fnc(test_dict) # printing result print ( "Dictionary after removal : " + str (res)) |
The original dictionary : {‘is’: {‘educational’: 4, ‘better’: 6}, ‘gfg’: {‘best’: 4, ‘good’: 5}, ‘CS’: {‘priceless’: 6}}
Dictionary after removal : {‘is’: {‘educational’: 4}, ‘gfg’: {‘best’: 4, ‘good’: 5}, ‘CS’: {}}
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