importlib.resources.read_text() raises FileNotFound

[Zac-HD]

BPO	46026
Nosy	@warsaw, @brettcannon, @jaraco, @Zac-HD

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-12-09.11:22:12.324>
labels = ['type-bug', 'library', '3.11']
title = 'importlib.resources.read_text() raises FileNotFound'
updated_at = <Date 2021-12-09.11:23:59.697>
user = 'https://github.com/Zac-HD'

bugs.python.org fields:

activity = <Date 2021-12-09.11:23:59.697>
actor = 'Zac Hatfield-Dodds'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-12-09.11:22:12.324>
creator = 'Zac Hatfield-Dodds'
dependencies = []
files = []
hgrepos = []
issue_num = 46026
keywords = []
message_count = 2.0
messages = ['408107', '408108']
nosy_count = 4.0
nosy_names = ['barry', 'brett.cannon', 'jaraco', 'Zac Hatfield-Dodds']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue46026'
versions = ['Python 3.11']

[Zac-HD]

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.

[Zac-HD]

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

Nuitka/Nuitka#1274 and
Nuitka/Nuitka@ffe861c

[Zac-HD]

This issue has been fixed in more recent alphas and can therefore be closed.