Python Dictionary

In Python, a dictionary is an unordered collection of key-value pairs. Dictionaries are a useful data type when you need to store a collection of items that can be accessed using a unique key.

Here's an example of how to create a dictionary in Python:

my_dict = {"apple": 1, "banana": 2, "orange": 3}

In this example, we've created a dictionary with three key-value pairs. The keys are strings that represent the names of fruits, and the values are integers that represent the quantities of each fruit.

You can access the values in a dictionary using the keys:

print(my_dict["apple"])    # prints 1
print(my_dict["banana"])   # prints 2

You can also modify the values in a dictionary:

my_dict["apple"] = 4

This changes the value associated with the "apple" key to 4.

You can add new key-value pairs to a dictionary:

my_dict["pear"] = 5

This adds a new key-value pair to the dictionary with the key "pear" and the value 5.

You can remove key-value pairs from a dictionary using the del keyword:

del my_dict["orange"]

This removes the key-value pair with the key "orange" from the dictionary.

Dictionaries are a useful data type when you need to store a collection of items that can be accessed using a unique key. They are commonly used in many areas of programming, such as database applications and web development.