"Easily create classes with rich, declarative attributes - Parameter objects - that include extended metadata for various purposes such as runtime type and range validation, documentation strings, default values or factories, nullability, etc. In this sense, Param is conceptually similar to libraries like Pydantic, Python's dataclasses, or Traitlets. A suite of expressive and composable APIs for reactive programming, enabling automatic updates on attribute changes, and declaring complex reactive dependencies and expressions that can be introspected by other frameworks to implement their own reactive workflows."
"Here is a very simple example showing both features at play. We declare a UserForm class with three parameters: age as an Integer parameter, name as a String parameter for user data, and submit as an Event parameter to simulate a button in a user interface. We also declare that the save_user_to_db method should be called automatically when the submit attribute changes."
Param provides declarative Parameter objects with extended metadata for runtime type and range validation, documentation strings, default values or factories, and nullability. Param supplies expressive, composable reactive APIs that enable automatic updates on attribute changes and the declaration of complex reactive dependencies and expressions that other frameworks can introspect. The combination facilitates building user interfaces, graphical applications, and responsive systems that require data integrity and automatic synchronization. Param serves as the backbone for HoloViz's Panel and HoloViews libraries. Param 2.3.0 includes improved docstrings.
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