pdm cannot be installed with python 3.14.0a6 - upstream issue with httpcore #3443
Description
Describe the bug
While installing pdm with python 314.0a6 the following error is produced while executing pdm --help at the end:
Traceback (most recent call last):
File "<python-input-0>", line 1, in <module>
import httpcore
File "/Users/rkm/temp/venv3.14/lib/python3.14/site-packages/httpcore/__init__.py", line 140, in <module>
setattr(__locals[__name], "__module__", "httpcore") # noqa
~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'typing.Union' object has no attribute '__module__' and no __dict__ for setting new attributes. Did you mean: '__reduce__'?
This is due to a known issue in httpcore and is being discussed in their repo at:
encode/httpcore#995
Heads up
To reproduce
python --version produces Python 3.14.0a6+
python install-pdm.py produces the error above.
Expected Behavior
Installation should succeed with Python 3.14.
Environment Information
PDM version:
2.23.0
Python Interpreter:
/var/home/klmcw/src/github.com/klmcwhirter/python-projects/oci-explorer/.venv/bin/python (3.14)
Project Root:
/var/home/klmcw/src/github.com/klmcwhirter/python-projects/oci-explorer
Local Packages:
{
"implementation_name": "cpython",
"implementation_version": "3.14.0a6",
"os_name": "posix",
"platform_machine": "x86_64",
"platform_release": "6.13.5-200.fc41.x86_64",
"platform_system": "Linux",
"platform_version": "#1 SMP PREEMPT_DYNAMIC Thu Feb 27 15:07:31 UTC 2025",
"python_full_version": "3.14.0",
"platform_python_implementation": "CPython",
"python_version": "3.14",
"sys_platform": "linux"
}
Verbose Command Output
N/A
Additional Context
To work around this I applied the patch locally mentioned at the top of encode/httpcore#995.
The pdm install succeeded.
Are you willing to submit a PR to fix this bug?
- Yes, I would like to submit a PR.