Python dictionaries consists of one or more keys—an object like a string or an integer. Each key is associated with a value, which can be any Python object. You use a key to obtain its related ...

The user_id variable (which we could use to compare against the dictionary’s keys) can be an int or None (“no valid user”), ... How to use template strings in Python 3.14. May 14, 2025 6 mins.

But when you also have the option to create dictionaries ... then be referenced at any time. In Python, a list can contain multiple data types: strings, integers, booleans, and more.

Note that Python will allow you to mix data types within your dictionary. Here, I have mixed strings and integers. This list stores a set of numbers with the person’s first name used as the key.