Python program to change the dictionary items

1) Direct (simple) way to change the dictionary items

The simple way is to change the dictionary items – assign the new value by referring to the key of the dictionary.

Syntax:

dictionary_name[key] = new_value

Program:

# Python program to change the dictionary items

# creating the dictionary
dict_a = {'id' : 101, 'name' : 'Amit', 'age': 21}

# printing the dictionary
print("Dictionary \'dict_a\' is...")
print(dict_a)

# updating the values of name and age
dict_a['name'] = 'Shivang Yadav'
dict_a['age'] = 23

# printing the dictionary 
# after changing the values
print("Updated Dictionary \'dict_a\' is...")
print(dict_a)

Output:

Dictionary 'dict_a' is...
{'name': 'Amit', 'id': 101, 'age': 21}
Updated Dictionary 'dict_a' is...
{'name': 'Shivang Yadav', 'id': 101, 'age': 23}

2) Using the update() method to change the dictionary items

The update() method can also be used to change the dictionary items. The update method accepts the key: value pair.

Syntax:

dictionary_name.update({key:value})

Program:

# Python program to change the dictionary items
# using the update() method

# creating the dictionary
dict_a = {'id' : 101, 'name' : 'Amit', 'age': 21}

# printing the dictionary
print("Dictionary \'dict_a\' is...")
print(dict_a)

# updating the values of name and age
# using the update() method
dict_a.update({'name': 'Shivang Yadav'})
dict_a.update({'age': 23})

# printing the dictionary 
# after changing the values
print("Updated Dictionary \'dict_a\' is...")
print(dict_a)

Output:

Dictionary 'dict_a' is...
{'id': 101, 'name': 'Amit', 'age': 21}
Updated Dictionary 'dict_a' is...
{'id': 101, 'name': 'Shivang Yadav', 'age': 23}