python-dotenv fails to build with Python 3.13.0a1.

+ /usr/bin/python3 -m tox --current-env -q --recreate -e py313
============================= test session starts ==============================
platform linux -- Python 3.13.0a1, pytest-7.4.2, pluggy-1.3.0
cachedir: .tox/py313/.pytest_cache
rootdir: /builddir/build/BUILD/python-dotenv-0.21.1
configfile: setup.cfg
testpaths: tests
collected 147 items / 1 skipped

tests/test_cli.py ............................FFFFF....                  [ 25%]
tests/test_main.py ..................................................... [ 61%]
.......                                                                  [ 65%]
tests/test_parser.py ...........................................         [ 95%]
tests/test_utils.py .                                                    [ 95%]
tests/test_variables.py ......                                           [100%]

=================================== FAILURES ===================================
____________________________ test_get_default_path _____________________________

tmp_path = PosixPath('/tmp/pytest-of-mockbuild/pytest-0/test_get_default_path0')

    def test_get_default_path(tmp_path):
        sh.cd(str(tmp_path))
        with open(str(tmp_path / ".env"), "w") as f:
            f.write("a=b")
    
>       result = sh.dotenv("get", "a")

tests/test_cli.py:160: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/usr/lib/python3.13/site-packages/sh.py:1508: in __call__
    rc = self.__class__.RunningCommandCls(cmd, call_args, stdin, stdout, stderr)
/usr/lib/python3.13/site-packages/sh.py:737: in __init__
    self.wait()
/usr/lib/python3.13/site-packages/sh.py:799: in wait
    self.handle_command_exit_code(exit_code)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = , code = 2

    def handle_command_exit_code(self, code):
        """here we determine if we had an exception, or an error code that we
        weren't expecting to see.  if we did, we create and raise an exception
        """
        ca = self.call_args
        exc_class = get_exc_exit_code_would_raise(code, ca["ok_code"], ca["piped"])
        if exc_class:
            exc = exc_class(
                self.ran, self.process.stdout, self.process.stderr, ca["truncate_exc"]
            )
>           raise exc
E           sh.ErrorReturnCode_2: 
E           
E             RAN: /builddir/build/BUILDROOT/python-dotenv-0.21.1-5.fc40.x86_64/usr/bin/dotenv get a
E           
E             STDOUT:
E           
E           
E             STDERR:
E           Error opening env file: [Errno 2] No such file or directory: '/builddir/build/BUILD/python-dotenv-0.21.1/.env'

/usr/lib/python3.13/site-packages/sh.py:826: ErrorReturnCode_2
___________________________________ test_run ___________________________________

tmp_path = PosixPath('/tmp/pytest-of-mockbuild/pytest-0/test_run0')

    def test_run(tmp_path):
        sh.cd(str(tmp_path))
        dotenv_file = str(tmp_path / ".env")
        with open(dotenv_file, "w") as f:
            f.write("a=b")
    
>       result = sh.dotenv("run", "printenv", "a")

tests/test_cli.py:171: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/usr/lib/python3.13/site-packages/sh.py:1508: in __call__
    rc = self.__class__.RunningCommandCls(cmd, call_args, stdin, stdout, stderr)
/usr/lib/python3.13/site-packages/sh.py:737: in __init__
    self.wait()
/usr/lib/python3.13/site-packages/sh.py:799: in wait
    self.handle_command_exit_code(exit_code)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = , code = 2

    def handle_command_exit_code(self, code):
        """here we determine if we had an exception, or an error code that we
        weren't expecting to see.  if we did, we create and raise an exception
        """
        ca = self.call_args
        exc_class = get_exc_exit_code_would_raise(code, ca["ok_code"], ca["piped"])
        if exc_class:
            exc = exc_class(
                self.ran, self.process.stdout, self.process.stderr, ca["truncate_exc"]
            )
>           raise exc
E           sh.ErrorReturnCode_2: 
E           
E             RAN: /builddir/build/BUILDROOT/python-dotenv-0.21.1-5.fc40.x86_64/usr/bin/dotenv run printenv a
E           
E             STDOUT:
E           
E           
E             STDERR:
E           Usage: dotenv run [OPTIONS] [COMMANDLINE]...
E           Try 'dotenv run --help' for help.
E           
E           Error: Invalid value: Invalid value for '-f' "/builddir/build/BUILD/python-dotenv-0.21.1/.env" does not exist.

/usr/lib/python3.13/site-packages/sh.py:826: ErrorReturnCode_2
_______________________ test_run_with_existing_variable ________________________

tmp_path = PosixPath('/tmp/pytest-of-mockbuild/pytest-0/test_run_with_existing_variabl0')

    def test_run_with_existing_variable(tmp_path):
        sh.cd(str(tmp_path))
        dotenv_file = str(tmp_path / ".env")
        with open(dotenv_file, "w") as f:
            f.write("a=b")
        env = dict(os.environ)
        env.update({"LANG": "en_US.UTF-8", "a": "c"})
    
>       result = sh.dotenv("run", "printenv", "a", _env=env)

tests/test_cli.py:184: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/usr/lib/python3.13/site-packages/sh.py:1508: in __call__
    rc = self.__class__.RunningCommandCls(cmd, call_args, stdin, stdout, stderr)
/usr/lib/python3.13/site-packages/sh.py:737: in __init__
    self.wait()
/usr/lib/python3.13/site-packages/sh.py:799: in wait
    self.handle_command_exit_code(exit_code)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = , code = 2

    def handle_command_exit_code(self, code):
        """here we determine if we had an exception, or an error code that we
        weren't expecting to see.  if we did, we create and raise an exception
        """
        ca = self.call_args
        exc_class = get_exc_exit_code_would_raise(code, ca["ok_code"], ca["piped"])
        if exc_class:
            exc = exc_class(
                self.ran, self.process.stdout, self.process.stderr, ca["truncate_exc"]
            )
>           raise exc
E           sh.ErrorReturnCode_2: 
E           
E             RAN: /builddir/build/BUILDROOT/python-dotenv-0.21.1-5.fc40.x86_64/usr/bin/dotenv run printenv a
E           
E             STDOUT:
E           
E           
E             STDERR:
E           Usage: dotenv run [OPTIONS] [COMMANDLINE]...
E           Try 'dotenv run --help' for help.
E           
E           Error: Invalid value: Invalid value for '-f' "/builddir/build/BUILD/python-dotenv-0.21.1/.env" does not exist.

/usr/lib/python3.13/site-packages/sh.py:826: ErrorReturnCode_2
________________ test_run_with_existing_variable_not_overridden ________________

tmp_path = PosixPath('/tmp/pytest-of-mockbuild/pytest-0/test_run_with_existing_variabl1')

    def test_run_with_existing_variable_not_overridden(tmp_path):
        sh.cd(str(tmp_path))
        dotenv_file = str(tmp_path / ".env")
        with open(dotenv_file, "w") as f:
            f.write("a=b")
        env = dict(os.environ)
        env.update({"LANG": "en_US.UTF-8", "a": "c"})
    
>       result = sh.dotenv("run", "--no-override", "printenv", "a", _env=env)

tests/test_cli.py:197: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/usr/lib/python3.13/site-packages/sh.py:1508: in __call__
    rc = self.__class__.RunningCommandCls(cmd, call_args, stdin, stdout, stderr)
/usr/lib/python3.13/site-packages/sh.py:737: in __init__
    self.wait()
/usr/lib/python3.13/site-packages/sh.py:799: in wait
    self.handle_command_exit_code(exit_code)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = , code = 2

    def handle_command_exit_code(self, code):
        """here we determine if we had an exception, or an error code that we
        weren't expecting to see.  if we did, we create and raise an exception
        """
        ca = self.call_args
        exc_class = get_exc_exit_code_would_raise(code, ca["ok_code"], ca["piped"])
        if exc_class:
            exc = exc_class(
                self.ran, self.process.stdout, self.process.stderr, ca["truncate_exc"]
            )
>           raise exc
E           sh.ErrorReturnCode_2: 
E           
E             RAN: /builddir/build/BUILDROOT/python-dotenv-0.21.1-5.fc40.x86_64/usr/bin/dotenv run --no-override printenv a
E           
E             STDOUT:
E           
E           
E             STDERR:
E           Usage: dotenv run [OPTIONS] [COMMANDLINE]...
E           Try 'dotenv run --help' for help.
E           
E           Error: Invalid value: Invalid value for '-f' "/builddir/build/BUILD/python-dotenv-0.21.1/.env" does not exist.

/usr/lib/python3.13/site-packages/sh.py:826: ErrorReturnCode_2
___________________________ test_run_with_none_value ___________________________

tmp_path = PosixPath('/tmp/pytest-of-mockbuild/pytest-0/test_run_with_none_value0')

    def test_run_with_none_value(tmp_path):
        sh.cd(str(tmp_path))
        dotenv_file = str(tmp_path / ".env")
        with open(dotenv_file, "w") as f:
            f.write("a=b\nc")
    
>       result = sh.dotenv("run", "printenv", "a")

tests/test_cli.py:208: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/usr/lib/python3.13/site-packages/sh.py:1508: in __call__
    rc = self.__class__.RunningCommandCls(cmd, call_args, stdin, stdout, stderr)
/usr/lib/python3.13/site-packages/sh.py:737: in __init__
    self.wait()
/usr/lib/python3.13/site-packages/sh.py:799: in wait
    self.handle_command_exit_code(exit_code)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = , code = 2

    def handle_command_exit_code(self, code):
        """here we determine if we had an exception, or an error code that we
        weren't expecting to see.  if we did, we create and raise an exception
        """
        ca = self.call_args
        exc_class = get_exc_exit_code_would_raise(code, ca["ok_code"], ca["piped"])
        if exc_class:
            exc = exc_class(
                self.ran, self.process.stdout, self.process.stderr, ca["truncate_exc"]
            )
>           raise exc
E           sh.ErrorReturnCode_2: 
E           
E             RAN: /builddir/build/BUILDROOT/python-dotenv-0.21.1-5.fc40.x86_64/usr/bin/dotenv run printenv a
E           
E             STDOUT:
E           
E           
E             STDERR:
E           Usage: dotenv run [OPTIONS] [COMMANDLINE]...
E           Try 'dotenv run --help' for help.
E           
E           Error: Invalid value: Invalid value for '-f' "/builddir/build/BUILD/python-dotenv-0.21.1/.env" does not exist.

/usr/lib/python3.13/site-packages/sh.py:826: ErrorReturnCode_2
=========================== short test summary info ============================
FAILED tests/test_cli.py::test_get_default_path - sh.ErrorReturnCode_2: 
FAILED tests/test_cli.py::test_run - sh.ErrorReturnCode_2: 
FAILED tests/test_cli.py::test_run_with_existing_variable - sh.ErrorReturnCod...
FAILED tests/test_cli.py::test_run_with_existing_variable_not_overridden - sh...
FAILED tests/test_cli.py::test_run_with_none_value - sh.ErrorReturnCode_2: 
=================== 5 failed, 142 passed, 1 skipped in 1.07s ===================

https://docs.python.org/3.13/whatsnew/3.13.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.13/fedora-rawhide-x86_64/06561163-python-dotenv/

For all our attempts to build python-dotenv with Python 3.13, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.13/package/python-dotenv/

Testing and mass rebuild of packages is happening in copr.
You can follow these instructions to test locally in mock if your package builds with Python 3.13:
https://copr.fedorainfracloud.org/coprs/g/python/python3.13/

Let us know here if you have any questions.

Python 3.13 is planned to be included in Fedora 41.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.13.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires),
so if this package is required a lot, it's important for us to get it fixed soon.

We'd appreciate help from the people who know this package best,
but if you don't want to work on this now, let us know so we can try to work around it on our side.