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How to update values in a dictionary in Python?

In Python, you can update the values of a dictionary by assigning new values to existing keys or by using the update() method. Here are a few ways to update values in a dictionary:

Square Bracket Notation:

my_dict = {'name': 'John', 'age': 30}

# Update the value of an existing key
my_dict['age'] = 31

update() Method:

my_dict = {'name': 'John', 'age': 30}

# Update the value of an existing key
my_dict.update({'age': 31})
# or
my_dict.update(age=31)

Using dict.update() with another dictionary:

my_dict = {'name': 'John', 'age': 30}
new_data = {'age': 31, 'city': 'New York'}

# Update values using another dictionary
my_dict.update(new_data)

Using dict.update() with an iterable of key-value pairs:

my_dict = {'name': 'John', 'age': 30}
new_data = [('age', 31), ('city', 'New York')]

# Update values using an iterable of key-value pairs
my_dict.update(new_data)

After updating the values, the dictionary will look like this:

{'name': 'John', 'age': 31, 'city': 'New York'}

By providing a new value to an existing key, you can update the value associated with that key in the dictionary. The update() method allows you to update multiple values at once by providing a dictionary or an iterable of key-value pairs.

It's important to note that if you use the update() method with a key that doesn't exist in the original dictionary, a new key-value pair will be added. If you want to update the values of only existing keys, make sure that the keys you provide already exist in the dictionary.

Updating values in a dictionary allows you to modify and manage the dictionary's contents based on your specific needs.

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