Also read: How to use lists in Python. This is not an array, however. That’s because an array is a data structure that uses an “index” or “key” to store each value.

Learn how Python's dictionary data structure works as a powerful and versatile way to store and retrieve objects and data in your applications.

Find out by using Python’s built-in profiler to locate bottlenecks in your Python code Credit: Thinkstock Python may not be the fastest language around, but it is often fast enough.

Python 3.9’s PEG-based parser removed these barriers, which long-term could lead to more elegant syntax — our first example of this change is the new parenthesized context managers.