Bug report

Bug description:

Context: In Python 3.12 the function importlib.resources.files() was updated: https://docs.python.org/3/library/importlib.resources.html#importlib.resources.files

Changed in version 3.12: package parameter was renamed to anchor. anchor can now be a non-package module and if omitted will default to the caller’s module. package is still accepted for compatibility but will raise a DeprecationWarning. Consider passing the anchor positionally or using importlib_resources >= 5.10 for a compatible interface on older Pythons.

The Issue: When using importlib.resources.files(), I am able to open and read a text file included as package data in my package. However, if I zip up my package with zipapp and run the .pyz file, it is unable to read the text file.
If I use importlib.resources.files("mypkg") it will work in both cases.

Minimal example:

Create a project directory named mypkg with the src layout.

Create the following files.

mypkg/src/mypkg/a.py

import importlib.resources

def main():
    x = importlib.resources.files() / "data.txt"
    print(x.read_text())

mypkg/src/mypkg/data.txt

datadata

In pyproject.toml make sure to set up the entry script and include the data file.

mypkg/pyproject.toml

[project.scripts]
myscript = "mypkg.a:main"

[tool.setuptools.package-data]
mypkg = ["*.txt"]

Install the package into a fresh Python (virtual) environment with pip.
Run myscript and verify it prints datadata.

Now back in the mypkg project root folder, we will generate a .pyz file with zipapp and run the program from the .pyz file.

Run pip install . --target buildtemp --upgrade && python3 -m zipapp buildtemp --main mypkg.a:main -p '/usr/bin/env python3' -o mypkg.pyz in the terminal.

Run ./mypkg.pyz. This results in an error:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/home/win/code/sandbox/python/mypkg/./mypkg.pyz/__main__.py", line 3, in <module>
  File "/home/win/code/sandbox/python/mypkg/./mypkg.pyz/mypkg/a.py", line 6, in main
  File "/home/win/.local/share/mise/installs/python/3.12.4/lib/python3.12/importlib/resources/abc.py", line 89, in read_text
    with self.open(encoding=encoding) as strm:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/win/.local/share/mise/installs/python/3.12.4/lib/python3.12/importlib/resources/_adapters.py", line 139, in open
    raise FileNotFoundError("Can't open orphan path")
FileNotFoundError: Can't open orphan path

Note that if you change x = importlib.resources.files() / "data.txt" to x = importlib.resources.files("mypkg") / "data.txt", it will work when running the .pyz file.

CPython versions tested on:

3.12

Operating systems tested on:

Linux, macOS

Linked PRs

• gh-121735: Fix module-adjacent references in zip files #123037
• [3.13] gh-121735: Fix module-adjacent references in zip files (GH-123037) #123986
• [3.12] gh-121735: Fix module-adjacent references in zip files (gh-123037) #124011