Changing dictionary values in Python
This tutorial will discuss various ways to change the value of a particular key in Python dictionary. We can do this by using the following methods.
-
dict.update()method -
forcycle. - Dictionary Unpacking
dict.update()How to change dictionary values
in Python using
In this method, we pass the new key-value pair to update()the method of the dictionary object. We can dict.update()change one or more key-value pairs using the method.
Sample code:
my_dict = {"Khan": 4, "Ali": 2, "Luna": 6, "Mark": 11, "Pooja": 8, "Sara": 1}
print("Original:")
print(my_dict)
my_dict.update({"Khan": 6, "Luna": 9})
print("\nAfter update:")
print(my_dict)
Output:
Original:
{'Khan': 4, 'Ali': 2, 'Luna': 6, 'Mark': 11, 'Pooja': 8, 'Sara': 1}
After update:
{'Khan': 6, 'Ali': 2, 'Luna': 9, 'Mark': 11, 'Pooja': 8, 'Sara': 1}
forChanging dictionary values
using loop in Python
In this method, we use fora loop to continuously iterate through the dictionary until we find the key whose value we want to modify. After getting the key, we can change its value by assigning a new value to the key.
Code example:
my_dict = {"Khan": 4, "Ali": 2, "Luna": 6, "Mark": 11, "Pooja": 8, "Sara": 1}
for key, value in my_dict.items():
if key == "Ali":
my_dict[key] = 10
print(my_dict)
Output:
{'Khan': 4, 'Ali': 10, 'Luna': 6, 'Mark': 11, 'Pooja': 8, 'Sara': 1}
Changing dictionary values in Python by using *unpacking operators
In this method, we can *change the value of the dictionary by unpacking the dictionary using the operator and then adding one or more key-value pairs that we want to change the dictionary.
Sample code:
my_dict = {"Khan": 4, "Ali": 2, "Luna": 6, "Mark": 11, "Pooja": 8, "Sara": 1}
my_dict = {**my_dict, "Pooja": 12}
print(my_dict)
Output:
{'Khan': 4, 'Ali': 2, 'Luna': 6, 'Mark': 11, 'Pooja': 12, 'Sara': 1}
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