Python – Add prefix to each key name in dictionary
Given a dictionary, update its each key by adding prefix to each key.
Input : test_dict = {‘Gfg’ : 6, ‘is’ : 7, ‘best’ : 9}, temp = “Pro”
Output : {‘ProGfg’ : 6, ‘Prois’ : 7, ‘Probest’ : 9}
Explanation : “Pro” prefix added to each key.Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.
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Input : test_dict = {‘Gfg’ : 6, ‘is’ : 7, ‘best’ : 9}, temp = “a”
Output : {‘aGfg’ : 6, ‘ais’ : 7, ‘abest’ : 9}
Explanation : “a” prefix added to each key.
Method #1 : Using dictionary comprehension
This is one of the methods in which this task can be performed. In this we construct new dictionary by performing concatenation of prefix with all keys.
Python3
# Python3 code to demonstrate working of # Add prefix to each key name in dictionary# Using loop # initializing dictionarytest_dict = {'Gfg' : 6, 'is' : 7, 'best' : 9, 'for' : 8, 'geeks' : 11} # printing original dictionaryprint("The original dictionary is : " + str(test_dict)) # initializing prefix temp = "Pro" # + operator is used to perform task of concatenationres = {temp + str(key): val for key, val in test_dict.items()} # printing result print("The extracted dictionary : " + str(res)) |
The original dictionary is : {'Gfg': 6, 'is': 7, 'best': 9, 'for': 8, 'geeks': 11}
The extracted dictionary : {'ProGfg': 6, 'Prois': 7, 'Probest': 9, 'Profor': 8, 'Progeeks': 11}
Method #2 : Using f strings + dictionary comprehension
The combination of above functionalities can be used to solve this problem. In this, we perform the task of concatenation using f strings. Works only in >=3.6 versions of Python.
Python3
# Python3 code to demonstrate working of # Add prefix to each key name in dictionary# Using f strings + dictionary comprehension # initializing dictionarytest_dict = {'Gfg' : 6, 'is' : 7, 'best' : 9, 'for' : 8, 'geeks' : 11} # printing original dictionaryprint("The original dictionary is : " + str(test_dict)) # initializing prefix temp = "Pro" # dictionary comprehension is used to bind result # f strings are used to bind prefix with keyres = {f"Pro{key}": val for key, val in test_dict.items()} # printing result print("The extracted dictionary : " + str(res)) |
The original dictionary is : {'Gfg': 6, 'is': 7, 'best': 9, 'for': 8, 'geeks': 11}
The extracted dictionary : {'ProGfg': 6, 'Prois': 7, 'Probest': 9, 'Profor': 8, 'Progeeks': 11}
