I have managed to compile Python to WebAssembly according the inscructions in the README. The python.html REPL works perfectly in the browser.
How can I load (and then import) a custom Python module into the browser? In my case, the module I’d like to import is a C extension.
I have found a working solution. I used the Emscripten FS object to load my file to the virtual filesystem.
FS.mkdir("/Module")
FS.mount(WORKERFS, {blobs: [{name: "__init__.py", data: blob}],}, "/Module")
The Python import statement works when I attempt to load the module.