Testing Hypothesis with Python 3.11.0a3, I've triggered a frustrating regression in importlib.resources:


# Both work in Python 3.9 and 3.10, but both fail in 3.11.0a3
from importlib.resources import files, read_text
read_text("hypothesis.vendor", "tlds-alpha-by-domain.txt")
files("hypothesis.vendor").joinpath("tlds-alpha-by-domain.txt").read_text()


Traceback (most recent call last):
  ...
  File "example.py", line 4, in <module>
    read_text("hypothesis.vendor", "tlds-alpha-by-domain.txt")
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "python3.11/importlib/_legacy.py", line 25, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "python3.11/importlib/_legacy.py", line 67, in read_text
    with open_text(package, resource, encoding, errors) as fp:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "python3.11/importlib/_legacy.py", line 25, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "python3.11/importlib/_legacy.py", line 50, in open_text
    return (_common.files(package) / _common.normalize_path(resource)).open(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "python3.11/importlib/_adapters.py", line 141, in open
    raise FileNotFoundError("Can't open orphan path")
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: Can't open orphan path


At first I thought this was just a problem with the _legacy shims, but since it also affects the new files() API it might be more serious.

This may have appeared in the wild, via the backport, in

https://github.com/Nuitka/Nuitka/issues/1274 and
https://github.com/Nuitka/Nuitka/commit/ffe861cfe972c6bf19f9eea1ff95e35d0e4240b4