PyOdide test failure

[simonw]

https://github.com/simonw/datasette/actions/runs/9469427870/job/26088069712

    from typing_extensions import deprecated  # noqa
ImportError: cannot import name 'deprecated' from 'typing_extensions' (/lib/python3.10/site-packages/typing_extensions.py)

[simonw]

Full stacktrace:

Error: Page.evaluate: PythonError: Traceback (most recent call last):
  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/_pyodide/_base.py", line 500, in eval_code_async
    await CodeRunner(
  File "/lib/python3.10/site-packages/_pyodide/_base.py", line 353, in run_async
    await coroutine
  File "<exec>", line 8, in <module>
  File "/lib/python3.10/site-packages/datasette/app.py", line 39, in <module>
    from .views.base import ureg
  File "/lib/python3.10/site-packages/datasette/views/base.py", line 11, in <module>
    import pint
  File "/lib/python3.10/site-packages/pint/__init__.py", line 18, in <module>
    from .delegates.formatter._format_helpers import formatter
  File "/lib/python3.10/site-packages/pint/delegates/__init__.py", line 12, in <module>
    from . import txt_defparser
  File "/lib/python3.10/site-packages/pint/delegates/txt_defparser/__init__.py", line 12, in <module>
    from .defparser import DefParser
  File "/lib/python3.10/site-packages/pint/delegates/txt_defparser/defparser.py", line 9, in <module>
    from ..base_defparser import ParserConfig
  File "/lib/python3.10/site-packages/pint/delegates/base_defparser.py", line 24, in <module>
    from pint.facets.plain.definitions import NotNumeric
  File "/lib/python3.10/site-packages/pint/facets/__init__.py", line 72, in <module>
    from .context import ContextRegistry, GenericContextRegistry
  File "/lib/python3.10/site-packages/pint/facets/context/__init__.py", line 14, in <module>
    from .definitions import ContextDefinition
  File "/lib/python3.10/site-packages/pint/facets/context/definitions.py", line 19, in <module>
    from ..plain import UnitDefinition
  File "/lib/python3.10/site-packages/pint/facets/plain/__init__.py", line 13, in <module>
    from .definitions import (
  File "/lib/python3.10/site-packages/pint/facets/plain/definitions.py", line 19, in <module>
    from ..._typing import Magnitude
  File "/lib/python3.10/site-packages/pint/_typing.py", line 8, in <module>
    from .compat import Never, TypeAlias
  File "/lib/python3.10/site-packages/pint/compat.py", line 46, in <module>
    from typing_extensions import deprecated  # noqa
ImportError: cannot import name 'deprecated' from 'typing_extensions' (/lib/python3.10/site-packages/typing_extensions.py)

[simonw]

Here's the PyOdide test runner: https://github.com/simonw/datasette/blob/main/.github/workflows/test-pyodide.yml

Attempting to replicate in https://pyodide.org/en/stable/console.html failed:

Welcome to the Pyodide 0.26.1 terminal emulator 🐍
Python 3.12.1 (main, Jun  7 2024 22:40:30) on WebAssembly/Emscripten
Type "help", "copyright", "credits" or "license" for more information.
>>> import micropip
>>> await micropip.install("Pint")
>>> import pint
>>> 

I was hoping it would raise the same error.

[simonw]

This is the actual test code:

datasette/test-in-pyodide-with-shot-scraper.sh

Lines 21 to 41 in e1bfab3

	shot-scraper javascript http://localhost:8529/ "
	async () => {
	let pyodide = await loadPyodide();
	await pyodide.loadPackage(['micropip', 'ssl', 'setuptools']);
	let output = await pyodide.runPythonAsync(\`
	import micropip
	await micropip.install('h11==0.12.0')
	await micropip.install('httpx==0.23')
	await micropip.install('http://localhost:8529/$wheel')
	import ssl
	import setuptools
	from datasette.app import Datasette
	ds = Datasette(memory=True, settings={'num_sql_threads': 0})
	(await ds.client.get('/_memory.json?sql=select+55+as+itworks&_shape=array')).text
	\`);
	if (JSON.parse(output)[0].itworks != 55) {
	throw 'Got ' + output + ', expected itworks: 55';
	}
	return 'Test passed!';
	}
	"

[simonw]

Running this runs tests locally:

./test-in-pyodide-with-shot-scraper.sh 

Got a surprising different error:

::1 - - [11/Jun/2024 09:43:46] "GET / HTTP/1.1" 200 -
Error: PythonError: Traceback (most recent call last):
  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/_pyodide/_base.py", line 500, in eval_code_async
    await CodeRunner(
  File "/lib/python3.10/site-packages/_pyodide/_base.py", line 237, in __init__
    self.ast = next(self._gen)
  File "/lib/python3.10/site-packages/_pyodide/_base.py", line 141, in _parse_and_compile_gen
    mod = compile(source, filename, mode, flags | ast.PyCF_ONLY_AST)
  File "<exec>", line 2
    import micropip
IndentationError: unexpected indent

[simonw]

That error was fixed by doing this:

wheel=$(basename $(ls dist/*.whl) | head -n 1)

[simonw]

... and now I can replicate that CI bug locally.

[simonw]

Fix was to force it to install a modern version of typing-extensions:

datasette/test-in-pyodide-with-shot-scraper.sh

Lines 36 to 37 in 9a3c3bf

	# To avoid 'from typing_extensions import deprecated' error:
	await micropip.install('typing-extensions>=4.12.2')