Thanks Serhiy, I've made the few additional changes you noted in the PR. I took out my attempt with path_t. However, here is why I think argument clinic (or something else?!) is actually intercepting the attempted call: With my temporary debugging, I have this function in Modules/_gdbmmodule.c: [clinic start generated code]*/ static PyObject * dbmopen_impl(PyObject *module, PyObject *filename, const char *flags, int mode) /*[clinic end generated code: output=9527750f5df90764 input=812b7d74399ceb0e]*/ { PyObject_Print(filename, stdout, 0); printf(" from _gdbmmodule.c (XXX)\n"); /* ... rest of function ...*/ And I have a very simplified test script: import _gdbm import sys from pathlib import Path print(sys.version) path = '/tmp/tmp.db' db = _gdbm.open(path, 'c') print("Opened with string path") db.close() db = _gdbm.open(Path(path), 'c') print("Opened with path-like") db.close() The output of running this is: 3.11.0a0 (heads/bpo-45133-dirty:0376feb030, Sep 8 2021, 00:39:39) [GCC 10.3.0] '/tmp/tmp.db' from _gdbmmodule.c (XXX) Opened with string path Traceback (most recent call last): File "/home/dmertz/tmp/pathlike-dbm.py", line 12, in <module> db = _gdbm.open(Path(path), 'c') ^^^^^^^^^^^^^^^^^^^^^^^^^^^ TypeError: open() argument 1 must be str, not PosixPath So before I get to the first line of the _gdbm.open() function, the TypeError is already occurring when passed a PosixPath. On Wed, Sep 8, 2021 at 3:49 AM Serhiy Storchaka wrote:

08.09.21 08:19, David Mertz, Ph.D. пише:

...

I attempted to do this today, as my first actual contribution to CPython itself. I think the prior attempt went down a wrong path, which is why neither PR could actually pass tests.

I've been looking at `posixmodule.c` for comparison, specifically.

The code in posixmodule.c is a bad example, because it is too general and supports many options. It gives the patch as char* and wchat_t* (on Windows), supports file descriptors and None, and format error messages for functions supporting multiple types. But if you only need a path as char*, you can just use PyUnicode_FSConverter().

There is an existing PR for this issue. It looks correct in general, but I left some comments.

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