## Latest changes
+## 0.39.0
+
* Allow path parameters to have default values (e.g. `None`) and discard them instead of raising an error.
* This allows declaring a parameter like `user_id: str = None` that can be taken from a query parameter, but the same path operation can be included in a router with a path `/users/{user_id}`, in which case will be taken from the path and will be required.
* PR [#464](https://github.com/tiangolo/fastapi/pull/464) by [@jonathanunderwood](https://github.com/jonathanunderwood).
"""FastAPI framework, high performance, easy to learn, fast to code, ready for production"""
-__version__ = "0.38.1"
+__version__ = "0.39.0"
from starlette.background import BackgroundTasks