Python – Replace dictionary value from other dictionary
Given two dictionaries, update the values from other dictionary if key is present in other dictionary.
Input : test_dict = {“Gfg” : 5, “is” : 8, “Best” : 10, “for” : 8, “Geeks” : 9},
updict = {“Geeks” : 10, “Best” : 17}
Output : {‘Gfg’: 5, ‘is’: 8, ‘Best’: 17, ‘for’: 8, ‘Geeks’: 10}
Explanation : “Geeks” and “Best” values updated to 10 and 17.Input : test_dict = {“Gfg” : 5, “is” : 8, “Best” : 10, “for” : 8, “Geeks” : 9},
updict = {“Geek” : 10, “Bet” : 17}
Output : {‘Gfg’: 5, ‘is’: 8, ‘Best’: 10, ‘for’: 8, ‘Geeks’: 9}
Explanation : No values matched, hence original dictionary.
Method #1 : Using loop
This is brute way in which this task can be performed. In this, we run a loop for each key in target dictionary and update in case the value is present in other dictionary.
Python3
# Python3 code to demonstrate working of # Replace dictionary value from other dictionary# Using loop # initializing dictionarytest_dict = {"Gfg" : 5, "is" : 8, "Best" : 10, "for" : 8, "Geeks" : 9} # printing original dictionaryprint("The original dictionary is : " + str(test_dict)) # initializing updictupdict = {"Gfg" : 10, "Best" : 17} for sub in test_dict: # checking if key present in other dictionary if sub in updict: test_dict[sub] = updict[sub] # printing result print("The updated dictionary: " + str(test_dict)) |
The original dictionary is : {‘Gfg’: 5, ‘is’: 8, ‘Best’: 10, ‘for’: 8, ‘Geeks’: 9}
The updated dictionary: {‘Gfg’: 10, ‘is’: 8, ‘Best’: 17, ‘for’: 8, ‘Geeks’: 9}
Method #2 : Using dictionary comprehension
This is one liner approach in which this task can be performed. In this, we iterate for all the dictionary values and update in a one-liner manner in dictionary comprehension.
Python3
# Python3 code to demonstrate working of # Replace dictionary value from other dictionary# Using dictionary comprehension # initializing dictionarytest_dict = {"Gfg" : 5, "is" : 8, "Best" : 10, "for" : 8, "Geeks" : 9} # printing original dictionaryprint("The original dictionary is : " + str(test_dict)) # initializing updictupdict = {"Gfg" : 10, "Best" : 17} res = {key: updict.get(key, test_dict[key]) for key in test_dict} # printing result print("The updated dictionary: " + str(res)) |
The original dictionary is : {‘Gfg’: 5, ‘is’: 8, ‘Best’: 10, ‘for’: 8, ‘Geeks’: 9}
The updated dictionary: {‘Gfg’: 10, ‘is’: 8, ‘Best’: 17, ‘for’: 8, ‘Geeks’: 9}
