Search results

Improved performance and arguably simpler code for dictionaries by changing the keys layout

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

Status: Open.

#142889 In python/cpython;

·markshannon openedon Dec 17, 2025

optimize list/set calls with generator expression

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

Status: Open.

#142863 In python/cpython;

·kumaraditya303 openedon Dec 17, 2025

Minor optimization for set object, swap bodies

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#142659 In python/cpython;

·nascheme openedon Dec 13, 2025

poor scaling of <code>functools.lru_cache</code>

3.15new features, bugs and security fixesnew features, bugs and security fixes

performancePerformance or resource usagePerformance or resource usage

topic-free-threading

Status: Open.

#142631 In python/cpython;

·kumaraditya303 openedon Dec 12, 2025

Calls across stack chunks perform badly

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

Status: Open.

#142183 In python/cpython;

·markshannon openedon Dec 2, 2025

Use mark_at_start() in GC full collection.

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Draft (not ready).

python/cpythonnumber 142028

#142028 In python/cpython;

·nascheme openedon Nov 28, 2025

Incremental GC does not collect garbage as soon as expected

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#142002 In python/cpython;

·nascheme openedon Nov 27, 2025

Add bytes_per_line parameter to binascii.b2a_base64

performancePerformance or resource usagePerformance or resource usage

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#141966 In python/cpython;

·cmaloney openedon Nov 26, 2025

Add a self-comparison fast path for some built-ins types

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#141858 In python/cpython;

·dima179-fuse openedon Nov 22, 2025

Compiling executors can result in excessively large amounts of machine code.

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

topic-JIT

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#141794 In python/cpython;

·markshannon openedon Nov 20, 2025

PyLong_AsInt32/64() are slow c.f. PyLong_AsLongAndOverflow()

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

topic-C-API

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#141546 In python/cpython;

·skirpichev openedon Nov 14, 2025

Factor out tracing and optimization heuristics into a single "policy" object.

3.15new features, bugs and security fixesnew features, bugs and security fixes

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

topic-JIT

Status: Open.

#141504 In python/cpython;

·markshannon openedon Nov 13, 2025