Use multiphase initialization in the _testcapi module to allow loading in subinterpreters. The isolation here isn't perfect as there's still some use of globals, but _testcapi should generally work in other interpreters.
In `_io__Buffered_flush_impl` the macro `CHECK_CLOSED` is used to check
the `buffered*` is in a good state to be flushed. That differs slightly
from `buffered_closed`.
In some cases, that difference would result in `close()` thinking the
file needed to be flushed and closed while `flush()` thought the file
was already closed.
This could happen during GC and would result in an unraisable exception.
Replace PyBytes_FromStringAndSize(NULL, size) and _PyBytes_Resize()
with the new public PyBytesWriter API.
Change also 'read' variable type from int to Py_ssize_t.
Performance about the same, using the benchmark from gh-120754:
```
pyperf compare_to main.json pep782.json
read_file_small: Mean +- std dev: [main] 5.71 us +- 0.05 us -> [pep782] 5.68 us +- 0.05 us: 1.01x faster
read_file_large: Mean +- std dev: [main] 89.7 us +- 0.9 us -> [pep782] 86.9 us +- 0.8 us: 1.03x faster
read_all_rst_bytes: Mean +- std dev: [main] 926 us +- 8 us -> [pep782] 920 us +- 12 us: 1.01x faster
read_all_rst_text: Mean +- std dev: [main] 2.24 ms +- 0.02 ms -> [pep782] 2.17 ms +- 0.04 ms: 1.03x faster
Benchmark hidden because not significant (1): read_all_py_bytes
Geometric mean: 1.01x faster
```
* Add documentation links to datetime strftime/strptime docstrings
- Add links to format codes documentation for all strftime methods
- Add links to format codes documentation for all strptime methods
- Addresses issue #97517
* Update C extension docstrings with format codes documentation
* Regenerate clinic code for updated docstrings
* Add clinic-generated header file for updated docstrings
* Fix docstring spacing consistency in both Python and C files
* Update Lib/_pydatetime.py
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
---------
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Replace PyBytes_FromStringAndSize(NULL, size) with the new public
PyBytesWriter API.
Don't build the fcntl with the limited C API anymore, since
the PyBytesWriter API is not part of the limited C API.
The following types are now immutable:
* `_curses_panel.panel`,
* `[posix,nt].ScandirIterator`, `[posix,nt].DirEntry` (exposed in `os.py`),
* `_remote_debugging.RemoteUnwinder`,
* `_tkinter.Tcl_Obj`, `_tkinter.tkapp`, `_tkinter.tktimertoken`,
* `zlib.Compress`, and `zlib.Decompress`.
While file timestamps can be anything the file system can store, most
lie between the recent past and the near future. Optimize fill_time()
for typical timestamps in three ways:
- When possible, convert to nanoseconds with C arithmetic.
- When using C arithmetic and the seconds member is not required (for
st_birthtime), avoid creating a long object.
- When using C arithmetic, reorder the code to avoid the null checks
implied in Py_XDECREF().
Co-authored-by: Victor Stinner <vstinner@python.org>
