Python 3.12 beta1: 'PosixPath' object has no attribute '_drv'

[buhtz]

Related to #830

--version on TravisCI returns Python 3.12.0a2+. Not sure if this is different from "3.12 beta1".

Here is another error in a pyfakefs using unittest.

======================================================================
ERROR: test_uuid_via_filesystem (test.test_tools.TestTools.test_uuid_via_filesystem)
Extract UUID from /dev filesystem.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/opt/python/3.12-dev/lib/python3.12/pathlib.py", line 464, in __str__
    return self._str
           ^^^^^^^^^
AttributeError: 'PosixPath' object has no attribute '_str'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/travis/virtualenv/python3.12-dev/lib/python3.12/site-packages/pyfakefs/fake_filesystem_unittest.py", line 142, in wrapped
    return f(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^
  File "/home/travis/build/bit-team/backintime/common/test/test_tools.py", line 482, in test_uuid_via_filesystem
    fake_fs.create_dir(path_dev)
  File "/home/travis/virtualenv/python3.12-dev/lib/python3.12/site-packages/pyfakefs/fake_filesystem.py", line 2037, in create_dir
    dir_path = self.make_string_path(directory_path)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/travis/virtualenv/python3.12-dev/lib/python3.12/site-packages/pyfakefs/fake_filesystem.py", line 2015, in make_string_path
    path_str = make_string_path(path)
               ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/travis/virtualenv/python3.12-dev/lib/python3.12/site-packages/pyfakefs/helpers.py", line 123, in make_string_path
    return cast(AnyStr, os.fspath(dir_name))
                        ^^^^^^^^^^^^^^^^^^^
  File "/opt/python/3.12-dev/lib/python3.12/pathlib.py", line 471, in __fspath__
    return str(self)
           ^^^^^^^^^
  File "/opt/python/3.12-dev/lib/python3.12/pathlib.py", line 466, in __str__
    self._str = self._format_parsed_parts(self._drv, self._root,
                                          ^^^^^^^^^
AttributeError: 'PosixPath' object has no attribute '_drv'

The related code
https://github.com/buhtz/backintime/blob/a80b655229207f90cd2552bec4bc869e597aa024/common/test/test_tools.py#L473-L513

[hugovk]

Python 3.12.0a2+. Not sure if this is different from "3.12 beta1".

3.12.0a2 means "Python 3.12.0 alpha 2" (released 2022-11-14). The + usually indicates it some commits later than the tag, but probably before alpha 3.

• https://peps.python.org/pep-0693/

So Travis is quite far behind. GitHub Actions is more up-to-date, and this project's CI is already testing 3.12 which is good to see 👍

Here's a build from last week, showing it using 3.12.0-alpha.7 (released 2023-04-04):

• https://github.com/pytest-dev/pyfakefs/actions/runs/5013473333/jobs/8986598070#step:3:17

[mrbean-bremen]

GH Actions are up to date, they already use 3.12 beta1 as of today.
Fixing this will take a bit more time, I think - there are hundreds of tests failing, mainly because faking open doesn't work anymore. There are also some more changes to pathlib, though I did expect this, given the history.

I will see if I can get this done over the weekend - I hope that the problem with open is relatively easy to solve.

[mrbean-bremen]

Please check if the problem still happens with the main branch, and with beta 1. I actually consider this invalid, as it was tested with alpha2, which had never been supported. The callstack shows that the respective pathlib code has sufficiently changed meanwhile. I'm going to close this - please write new issues if you find problems with the beta1 (or later) Python version.

[buhtz]

I can confirm you are right.

After TravisCI no supports Python 3.12.0b1+ there is no error anymore.