the_information_nexus/random/Dictionary.md

Dictionary

They are also known as mapping type, they map keys to the values.

What data types you can use for keys in Python dictionary?

Any data type which is immutable can be used as a key. To understand this behavior we would need to understand how dictionary works behind the scene, which is too advanced for this course.

For now just remember that immutable data types such as string, int, float, boolean, tuples, etc, can be used as keys.

pizza = {
        10: "small",
        8.99: "price",
        ("cheese", "olives"): "toppings",
        True: "available",
    }

print(pizza[10]) # prints => "small"
print(pizza[8.99]) # prints => "price"
print(pizza[("cheese", "olives")]) # prints => "toppings"
print(pizza[True]) # prints => "available"

pizza is also a perfectly valid dictionary, but does not have practical usability.