Shiny for Python

Shiny for Python (py-shiny) builds reactive web apps in pure Python. Two modes: Core (an explicit app_ui object plus a server(input, output, session) function) and Express (top-level code in the app file is the UI, with outputs defined inline). The reactive graph is the engine: reading a reactive source (input.x(), a reactive.value, a @reactive.calc) inside a reactive context registers a dependency, so changing that source re-runs everything that read it — you never call outputs or schedule updates yourself.

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