In Python dictionaries, you don’t use the term “append” like you would with lists. Instead, you add a new key-value pair to a dictionary. Here’s how you can add key-value pairs to a dictionary, along with a description:

Adding a Key-Value Pair to a Dictionary:

You can add a new key-value pair to a dictionary using the following syntax:

my_dict[key] = value

Here’s a brief description:

• my_dict: The name of the dictionary to which you want to add a key-value pair.
• key: The key you want to add or update.
• value: The value associated with the key.

Example:

# Creating an empty dictionary
person_info = {}

# Adding key-value pairs
person_info['name'] = 'John'
person_info['age'] = 25
person_info['city'] = 'New York'

In this example:

• Initially, person_info is an empty dictionary.
• The ['name'] = 'John' line adds a key-value pair where the key is ‘name’ and the value is ‘John’.
• Similarly, the next two lines add key-value pairs for ‘age’ and ‘city’.

Now, person_info looks like this:

{
    'name': 'John',
    'age': 25,
    'city': 'New York'
}

Updating an Existing Key:

If the key already exists in the dictionary, assigning a new value to that key will update its value:

# Updating the 'age' key
person_info['age'] = 26

Now, person_info will be:

{
    'name': 'John',
    'age': 26,
    'city': 'New York'
}

Adding key-value pairs is a fundamental operation when working with dictionaries in Python. It allows you to dynamically build and modify data structures based on your program’s needs.