Python | Ways to change keys in dictionary

Given a dictionary, the task is to change the key based on the requirement. Let’s see different methods we can do this task.

Method #1 : Using naive method

# Python code to demonstrate 
# changing keys of dictionary 
# using naive method 
  
# inititialising dictionary 
ini_dict = {'nikhil': 1, 'vashu' : 5, 
            'manjeet' : 10, 'akshat' : 15} 
  
# printing initial json 
print ("initial 1st dictionary", ini_dict) 
  
# changing keys of dictionary 
ini_dict['akash'] = ini_dict['akshat'] 
del ini_dict['akshat'] 
  
  
# printing final result 
print ("final dictionary", str(ini_dict)) 

Output:

initial 1st dictionary {‘akshat’: 15, ‘nikhil’: 1, ‘manjeet’: 10, ‘vashu’: 5}
final dictionary {‘akash’: 15, ‘nikhil’: 1, ‘manjeet’: 10, ‘vashu’: 5}

Method #2: Using pop()

# Python code to demonstrate 
# changing keys of dictionary 
# using pop() method 
  
# inititialising dictionary 
ini_dict = {'nikhil': 1, 'vashu' : 5,  
            'manjeet' : 10, 'akshat' : 15} 
  
# printing initial json 
print ("initial 1st dictionary", ini_dict) 
  
# changing keys of dictionary 
ini_dict['akash'] = ini_dict.pop('akshat') 
  
# printing final result 
print ("final dictionary", str(ini_dict)) 

Output:

initial 1st dictionary {‘akshat’: 15, ‘manjeet’: 10, ‘vashu’: 5, ‘nikhil’: 1}
final dictionary {‘akash’: 15, ‘manjeet’: 10, ‘vashu’: 5, ‘nikhil’: 1}

Method #3: Using zip()

Suppose we want to change all keys of dictionary.

# Python code to demonstrate 
# changing all keys of dictionary 
# corresponding to list using zip() 
  
# inititialising dictionary 
ini_dict = {'nikhil': 1, 'vashu' : 5,  
            'manjeet' : 10, 'akshat' : 15} 
  
# initialising list 
ini_list = ['a', 'b', 'c', 'd'] 
  
# printing initial json 
print ("initial 1st dictionary", ini_dict) 
  
# changing keys of dictionary 
final_dict = dict(zip(ini_list, list(ini_dict.values()))) 
  
# printing final result 
print ("final dictionary", str(final_dict)) 

Output:

initial 1st dictionary {‘akshat’: 15, ‘manjeet’: 10, ‘vashu’: 5, ‘nikhil’: 1}
final dictionary {‘c’: 5, ‘d’: 1, ‘a’: 15, ‘b’: 10}

My Personal Notes

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