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Speed up open().read() pattern by reducing the number of system calls

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# Feature or enhancement ### Proposal: I came across some seemingly redundant `fstat()` and `lseek()` calls when working on a tool that scanned a directory of lots of small YAML...

cmaloney

riscv64 fails to build Python/perf_jit_trampoline.c: Unsupported target architecture

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build: https://buildbot.python.org/all/#/builders/1379/builds/625 ``` gcc -c -fno-strict-overflow -fstack-protector-strong -Wtrampolines -Wsign-compare -DNDEBUG -g -O3 -Wall -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden -I./Include/internal -I./Include/internal/mimalloc -I. -I./Include -DPy_BUILD_CORE -o Python/perf_trampoline.o Python/perf_trampoline.c gcc -c...

vstinner

gh-112068: C API: Add support of nullable arguments in PyArg_Parse (prefix)

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* Issue: gh-112068

serhiy-storchaka

gh-112068: C API: Add support of nullable arguments in PyArg_Parse (suffix)

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This is a variant of #121187, but with suffix instead of prefix. `i?` instead of `?i`. * Issue: gh-112068

serhiy-storchaka

gh-118926: Deferred reference counting GC changes for free threading

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This PR mainly introduces GC changes to the free threading GC to support deferred reference counting in the future. To get this to work, new stack references *must* immediately live...

Fidget-Spinner

# Feature or enhancement ### Proposal: There are different ways for processes to communicate in Python, one of which, on Unix-based systems, is pipes. While analyzing the performance behavior of...

aplaikner

Consider adding public PyLong_FlipSign() function

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# Feature or enhancement ### Proposal: Currently there is only a slow way (i.e. ``PyNumber_Negative()``) to invert the sign of a big integer. Direct manipulation of the sign value is...

skirpichev

The C-API for Python to C integer conversion is, to be frank, a mess.

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The C-API has built up over 30 years, in a haphazard way. So, it is no surprise that it is a bit of a mess. What makes it worse is...

markshannon

dataclass overriding a property in the parent class is broken

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# Bug report ### Bug description: Consider the following snippet ```python @dc.dataclass class A: a: int @property def b(self) -> int: return 1 @dc.dataclass class B(A): b: int = dc.field(default_factory=lambda:...

marksandler2

gh-111673: Refactor test_float/complex.py (split out support classes)

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First commit mostly taken from #26827, second - some simple extension of this. @serhiy-storchaka * Issue: gh-111673

skirpichev