Python & FastAPI - Annotated Type for Data Validation + Metadata!

In this video, we'll explore the Annotated type in Python, and how it can be used to add metadata to an existing type. Custom logic can then process that metadata and perform actions based on the values used! We'll see how Annotated is used in FastAPI with the Query, Path, Header and Cookie parameters to handler functions, and will dive deeper into the internals of the typing module to see how we can extract and process the metadata passed to Annotated. ☕️ ??? ?? ? ??????: To support the channel and encourage new videos, please consider buying me a coffee here: https://ko-fi.com/bugbytes ? ????????: 00:00 Intro 00:59 typing.Annotated - Annotated type in python 04:41 FastAPI annotations with Query and Path object 12:35 Typing module internals 19:07 Creating Decorator for annotation checks ▶️ Full Playlist: ?????? ?????: ? Blog: https://bugbytes.io/posts/ ? Github: https://github.com/bugbytes-io/ ? Twitter: https://twitter.com/bugbytesio ? ??????? ??????? ??? ???????????: Python Typing: https://docs.python.org/3/library/typing.html Annotated: https://docs.python.org/3/library/typing.html#typing.Annotated FastAPI Query Parameter Annotations: https://fastapi.tiangolo.com/tutorial/query-params-str-validations/ StackOverflow answer: https://stackoverflow.com/questions/68454202/how-to-use-maxlen-of-typing-annotation-of-python-3-9 #python #fastapi #webdevelopment