cyx-6 commented on issue #694:
URL: https://github.com/apache/tvm-ffi/issues/694#issuecomment-5133466565
Thanks for trying the pre-release on Python 3.15 free-threaded!
The traceback points at the cause directly:
```
File "/home/cc/venv/lib/python3.15t/site-packages/pathlib.py", line 10, in
<module>
from collections import Sequence
```
That's `site-packages/pathlib.py` — the old [`pathlib`
1.0.1](https://pypi.org/project/pathlib/) backport from PyPI, not the standard
library's `pathlib` (which is a package and has no such import). It was
published in 2014 for Python 2.7/3.2–3.3, became unnecessary in 3.4 when
`pathlib` entered the stdlib, and hasn't been updated since — its `from
collections import Sequence` stopped working in Python 3.10 when the ABC
aliases were removed.
Since it shadows the stdlib module, anything importing `pathlib` fails,
including Cython. That's why the build stops before reaching any tvm-ffi code —
it got through 39 of 41 steps, so the C++ all compiled fine.
The fix:
```bash
pip uninstall pathlib
```
`pip show pathlib` will show `Required-by`, in case something is pulling it
in as a transitive dependency.
I confirmed v0.1.13 builds and works on CPython 3.15 free-threaded once it's
removed. Note that 3.15 isn't in our wheel matrix yet (we build
`cp39`–`cp314t`), so a source build is the only route there for now.
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