I got a build from the pyodide branch to work!

``` Welcome to the Pyodide terminal emulator 🐍 Python 3.10.2 (main, Apr 9 2022 20:52:01) on WebAssembly VM Type "help", "copyright", "credits" or "license" for more information.

import micropip await micropip.install("https://s3.amazonaws.com/simonwillison-cors-allowed-public/datasette-0.62a0-py3-none-any.whl") Traceback (most recent call last): File "<console>", line 1, in <module> File "/lib/python3.10/asyncio/futures.py", line 284, in await yield self # This tells Task to wait for completion. File "/lib/python3.10/asyncio/tasks.py", line 304, in wakeup future.result() File "/lib/python3.10/asyncio/futures.py", line 201, in result raise self._exception File "/lib/python3.10/asyncio/tasks.py", line 234, in __step result = coro.throw(exc) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 183, in install transaction = await self.gather_requirements(requirements, ctx, keep_going) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 173, in gather_requirements await gather(requirement_promises) File "/lib/python3.10/asyncio/futures.py", line 284, in await yield self # This tells Task to wait for completion. File "/lib/python3.10/asyncio/tasks.py", line 304, in wakeup future.result() File "/lib/python3.10/asyncio/futures.py", line 201, in result raise self._exception File "/lib/python3.10/asyncio/tasks.py", line 232, in __step result = coro.send(None) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 245, in add_requirement await self.add_wheel(name, wheel, version, (), ctx, transaction) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 316, in add_wheel await self.add_requirement(recurs_req, ctx, transaction) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 291, in add_requirement await self.add_wheel( File "/lib/python3.10/site-packages/micropip/_micropip.py", line 316, in add_wheel await self.add_requirement(recurs_req, ctx, transaction) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 291, in add_requirement await self.add_wheel( File "/lib/python3.10/site-packages/micropip/_micropip.py", line 316, in add_wheel await self.add_requirement(recurs_req, ctx, transaction) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 276, in add_requirement raise ValueError( ValueError: Requested 'h11<0.13,>=0.11', but h11==0.13.0 is already installed await micropip.install("https://s3.amazonaws.com/simonwillison-cors-allowed-public/datasette-0.62a0-py3-none-any.whl") Traceback (most recent call last): File "<console>", line 1, in <module> File "/lib/python3.10/asyncio/futures.py", line 284, in __await yield self # This tells Task to wait for completion. File "/lib/python3.10/asyncio/tasks.py", line 304, in __wakeup future.result() File "/lib/python3.10/asyncio/futures.py", line 201, in result raise self._exception File "/lib/python3.10/asyncio/tasks.py", line 234, in __step result = coro.throw(exc) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 183, in install transaction = await self.gather_requirements(requirements, ctx, keep_going) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 173, in gather_requirements await gather(requirement_promises) File "/lib/python3.10/asyncio/futures.py", line 284, in __await yield self # This tells Task to wait for completion. File "/lib/python3.10/asyncio/tasks.py", line 304, in wakeup future.result() File "/lib/python3.10/asyncio/futures.py", line 201, in result raise self._exception File "/lib/python3.10/asyncio/tasks.py", line 232, in __step result = coro.send(None) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 245, in add_requirement await self.add_wheel(name, wheel, version, (), ctx, transaction) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 316, in add_wheel await self.add_requirement(recurs_req, ctx, transaction) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 291, in add_requirement await self.add_wheel( File "/lib/python3.10/site-packages/micropip/_micropip.py", line 316, in add_wheel await self.add_requirement(recurs_req, ctx, transaction) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 291, in add_requirement await self.add_wheel( File "/lib/python3.10/site-packages/micropip/_micropip.py", line 316, in add_wheel await self.add_requirement(recurs_req, ctx, transaction) File "/lib/python3.10/site-packages/micropip/_micropip.py", line 276, in add_requirement raise ValueError( ValueError: Requested 'h11<0.13,>=0.11', but h11==0.13.0 is already installed await micropip.install("h11==0.12") await micropip.install("https://s3.amazonaws.com/simonwillison-cors-allowed-public/datasette-0.62a0-py3-none-any.whl") import datasette from datasette.app import Datasette Traceback (most recent call last): File "<console>", line 1, in <module> File "/lib/python3.10/site-packages/datasette/app.py", line 9, in <module> import httpx File "/lib/python3.10/site-packages/httpx/__init.py", line 2, in <module> from ._api import delete, get, head, options, patch, post, put, request, stream File "/lib/python3.10/site-packages/httpx/_api.py", line 4, in <module> from ._client import Client File "/lib/python3.10/site-packages/httpx/_client.py", line 9, in <module> from ._auth import Auth, BasicAuth, FunctionAuth File "/lib/python3.10/site-packages/httpx/_auth.py", line 10, in <module> from ._models import Request, Response File "/lib/python3.10/site-packages/httpx/_models.py", line 16, in <module> from ._content import ByteStream, UnattachedStream, encode_request, encode_response File "/lib/python3.10/site-packages/httpx/_content.py", line 17, in <module> from ._multipart import MultipartStream File "/lib/python3.10/site-packages/httpx/_multipart.py", line 7, in <module> from ._types import ( File "/lib/python3.10/site-packages/httpx/_types.py", line 5, in <module> import ssl File "/lib/python3.10/ssl.py", line 98, in <module> import _ssl # if we can't import it, let the error propagate ModuleNotFoundError: No module named '_ssl' import ssl from datasette.app import Datasette Traceback (most recent call last): File "<console>", line 1, in <module> File "/lib/python3.10/site-packages/datasette/app.py", line 14, in <module> import pkg_resources ModuleNotFoundError: No module named 'pkg_resources' import setuptools from datasette.app import Datasette ds = Datasette(memory=True) ds <datasette.app.Datasette object at 0x1cc4fb8> await ds.client.get("/") Traceback (most recent call last): File "/lib/python3.10/site-packages/datasette/app.py", line 1268, in route_path response = await view(request, send) File "/lib/python3.10/site-packages/datasette/views/base.py", line 134, in view return await self.dispatch_request(request) File "/lib/python3.10/site-packages/datasette/views/base.py", line 89, in dispatch_request await self.ds.refresh_schemas() File "/lib/python3.10/site-packages/datasette/app.py", line 353, in refresh_schemas await self._refresh_schemas() File "/lib/python3.10/site-packages/datasette/app.py", line 358, in _refresh_schemas await init_internal_db(internal_db) File "/lib/python3.10/site-packages/datasette/utils/internal_db.py", line 65, in init_internal_db await db.execute_write_script(create_tables_sql) File "/lib/python3.10/site-packages/datasette/database.py", line 116, in execute_write_script results = await self.execute_write_fn(_inner, block=block) File "/lib/python3.10/site-packages/datasette/database.py", line 155, in execute_write_fn self._write_thread.start() File "/lib/python3.10/threading.py", line 928, in start _start_new_thread(self._bootstrap, ()) RuntimeError: can't start new thread <Response [500 Internal Server Error]> ds = Datasette(memory=True, settings={"num_sql_threads": 0}) await ds.client.get("/") <Response [200 OK]> (await ds.client.get("/")).text '<!DOCTYPE html>\n<html>\n<head>\n <title>Datasette: _memory</title>\n <link rel="stylesheet" href="/-/static/app.css ?cead5a">\n <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">\n\n<link rel="alterna te" type="application/json+datasette" href="http://localhost/.json"></head>\n<body class="index">\n

\n<header><nav>\n \n \n</nav></header>\n\n\n\n \n\n\n\n<section class="content">\n\n

Datasette

\n\n\n\n\n\n

r detailsClickedWithin = null;\n while (target && target.tagName != \'DETAILS\') {\n target = target.parentNode;\ n }\n if (target && target.tagName == \'DETAILS\') {\n detailsClickedWithin = target;\n }\n Array.from(d ocument.getElementsByTagName(\'details\')).filter(\n (details) => details.open && details != detailsClickedWithin\n ).forEach(details => details.open = false);\n});\n</script>\n\n\n\n\n</body>\n </html>'

```

That ValueError: Requested 'h11<0.13,>=0.11', but h11==0.13.0 is already installed error is annoying. I assume it's a uvicorn dependency clash of some sort, because I wasn't getting that when I removed uvicorn as a dependency.

I can avoid it by running this first though:

await micropip.install("h11==0.12")