Anaconda’s new project puts the Python runtime on a web page, using a single JS include and providing access to several popular Python packages.
PyScript runs in-line Python code using a full port of the CPython runtime to WebAssembly. You insert your Python code inside py-script> tags, and the output is placed in a div> of your choice. A py-repl> tag inserts a REPL block that allows you to enter and execute code, while a py-env> tag operates similarly to a repository’s requirements.txt file to list required packages.
Many common Python packages, such as the scientific libraries included with Anaconda—NumPy, Pandas, Scikit-learn, and many others—are also supported by the PyScript runtime. Demos in the PyScript repository demonstrate several approaches.
Third-party packages, on the other hand, operate best if they are pure Python. PyScript currently lacks a mechanism for automatically generating platform binaries for packages, while this is theoretically conceivable. Another barrier is the time and bandwidth required to download and install all of the components required for a certain PyScript-enabled web page. The main Python runtime is around 3.4MB of WebAssembly, however, it is cached after the initial load.
According to a community message board post, Anaconda’s goal for PyScript is to offer one feasible answer to the long-standing challenge of packaging and distributing Python programs. It has long been difficult to package up a Python script, especially one with many dependencies, for someone else to use as-is without the Python runtime.
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