Sometimes, while working with Python dictionaries, we can have a problem in which we need to extract all the keys of nested dictionaries and render them in sorted order. This kind of application can occur in domains in which we work with data. Lets discuss certain ways in which this task can be performed.
Method #1 : Using yield + isinstance() + loop
The combination of above functions can be used to perform this task. In this, we perform the task of detection of keys using isinstance(). The yield keyword is used to add intermediate results.
# Python3 code to demonstrate working of # Sorted Nested Keys in Dictionary# Using yield + isinstance() + loop def hlper_fnc(test_dict): for key, val in test_dict.items(): yield key if isinstance(val, dict): yield from val # initializing dictionarytest_dict = {'gfg': 43, 'is': {'best' : 14, 'for' : 35, 'geeks' : 42}, 'and' : {'CS' : 29}} # printing original dictionaryprint("The original dictionary is : " + str(test_dict)) # Sorted Nested Keys in Dictionary# Using yield + isinstance() + loopres = sorted(hlper_fnc(test_dict)) # printing result print("The sorted nested keys : " + str(res)) |
The original dictionary is : {‘and’: {‘CS’: 29}, ‘gfg’: 43, ‘is’: {‘for’: 35, ‘best’: 14, ‘geeks’: 42}}
The sorted nested keys : [‘CS’, ‘and’, ‘best’, ‘for’, ‘geeks’, ‘gfg’, ‘is’]
Method #2 : Using sorted() + list comprehension + isinstance()
The combination of above functions offer a shorthand solution to this problem. In this, the sorting is done using sorted(). The isinstance() is used to detect keys.
# Python3 code to demonstrate working of # Sorted Nested Keys in Dictionary# Using sorted() + list comprehension + isinstance() # initializing dictionarytest_dict = {'gfg': 43, 'is': {'best' : 14, 'for' : 35, 'geeks' : 42}, 'and' : {'CS' : 29}} # printing original dictionaryprint("The original dictionary is : " + str(test_dict)) # Sorted Nested Keys in Dictionary# Using sorted() + list comprehension + isinstance()res = sorted([key for val in test_dict.values() if isinstance(val, dict) for key in val] + list(test_dict)) # printing result print("The sorted nested keys : " + str(res)) |
The original dictionary is : {‘and’: {‘CS’: 29}, ‘gfg’: 43, ‘is’: {‘for’: 35, ‘best’: 14, ‘geeks’: 42}}
The sorted nested keys : [‘CS’, ‘and’, ‘best’, ‘for’, ‘geeks’, ‘gfg’, ‘is’]
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