Python – Combine two dictionaries having key of the first dictionary and value of the second dictionary
Given two dictionaries. The task is to merge them in such a way that the resulting dictionary contains the key from the first dictionary and value from the second dictionary.
Examples:
Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.
To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning - Basic Level Course
Input : test_dict1 = {“Gfg” : 20, “is” : 36, “best” : 100}, test_dict2 = {“Gfg2” : 26, “is2” : 20, “best2” : 70}
Output : {‘Gfg’: 26, ‘is’: 20, ‘best’: 70}
Explanation : Similar index keys’ values assigned to dictionary 1.Input : test_dict1 = {“Gfg” : 20, “best” : 100}, test_dict2 = {“Gfg2” : 26, “best2” : 70}
Output : {‘Gfg’: 26, ‘best’: 70}
Explanation : Similar index keys’ values assigned to dictionary 1.
Method #1 : Using loop + keys()
This is one way in which this task can be performed. In this, we extract all the keys using keys() and then assign required values inside loop.
Python3
# Python3 code to demonstrate working of # Assign similar index values in Dictionary# Using loop + keys() # initializing dictionariestest_dict1 = {"Gfg" : 20, "is" : 36, "best" : 100}test_dict2 = {"Gfg2" : 26, "is2" : 19, "best2" : 70} # printing original dictionariesprint("The original dictionary 1 is : " + str(test_dict1))print("The original dictionary 2 is : " + str(test_dict2)) # extracting keys and valueskeys1 = list(test_dict1.keys())vals2 = list(test_dict2.values()) # assigning new values res = dict()for idx in range(len(keys1)): res[keys1[idx]] = vals2[idx] # printing result print("Mapped dictionary : " + str(res)) |
The original dictionary 1 is : {‘Gfg’: 20, ‘is’: 36, ‘best’: 100}
The original dictionary 2 is : {‘Gfg2’: 26, ‘is2’: 19, ‘best2’: 70}
Mapped dictionary : {‘Gfg’: 26, ‘is’: 19, ‘best’: 70}
Method #2 : Using zip() + values()
This is yet another way in which this task can be performed. In this, we perform the task of mapping using zip(), extracting values using values().
Python3
# Python3 code to demonstrate working of # Assign similar index values in Dictionary# Using zip() + values() # initializing dictionariestest_dict1 = {"Gfg" : 20, "is" : 36, "best" : 100}test_dict2 = {"Gfg2" : 26, "is2" : 19, "best2" : 70} # printing original dictionariesprint("The original dictionary 1 is : " + str(test_dict1))print("The original dictionary 2 is : " + str(test_dict2)) # using zip() to perform required dict. mapping res = dict(zip(test_dict1, test_dict2.values())) # printing result print("Mapped dictionary : " + str(res)) |
The original dictionary 1 is : {‘Gfg’: 20, ‘is’: 36, ‘best’: 100}
The original dictionary 2 is : {‘Gfg2’: 26, ‘is2’: 19, ‘best2’: 70}
Mapped dictionary : {‘Gfg’: 26, ‘is’: 19, ‘best’: 70}
