Most people heard at least once or focused really hard on studying design patterns. But did you know there are also lots of anti-patterns we should try to avoid? In this talk I intend to present some of the most known anti-design patterns that we'll promise never to use ... but for some reason or slip end up using it anyway. I will start showing more generic anti-patterns that apply to all languages and software in general, and move on to Python specifics, by using The Little Book of Python Anti-Patterns. Since there will be Python code, attendees should fell confort with some basic to intermediate Python knowledge. For example: know about classes, constructors, parameters/arguments, etc.