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formatfloat wrong return in unicode_format.c

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

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

Status: Open.

#151845 In python/cpython;

· aisk opened on Jun 21, 2026

Segfault: NULL info deref in _excinfo_clear_type via _PyXI_FreeExcInfo(NULL) (Python/crossinterp.c:1319)

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

topic-subinterpreters

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

Status: Open.

#151842 In python/cpython;

· amruthamodela06 opened on Jun 21, 2026

Doc README omits some documentation make targets

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#151833 In python/cpython;

· Neiland85 opened on Jun 21, 2026

marshal.loads() raises SystemError instead of ValueError on an invalid code object

extension-modulesC modules in the Modules dirC modules in the Modules dir

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

Status: Open.

#151830 In python/cpython;

· tonghuaroot opened on Jun 21, 2026

Support copy() for zipfile

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.

#151824 In python/cpython;

· danny0838 opened on Jun 21, 2026

Colorize commands in the REPL

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

topic-replRelated to the interactive shellRelated to the interactive shell

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#151822 In python/cpython;

· johnslavik opened on Jun 20, 2026

Regex yes/no-pattern has undocumented implication

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#151819 In python/cpython;

· ffrank opened on Jun 20, 2026

Double free / use-after-free in list.append() when the list grows under MemoryError (_CALL_LIST_APPEND)

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

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#151818 In python/cpython;

· devdanzin opened on Jun 20, 2026

Segfault: dealloc of uninitialized iterator in template_iter (Objects/templateobject.c:232)

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

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#151815 In python/cpython;

· amruthamodela06 opened on Jun 20, 2026

Runaway memory use when repeatedly printing empty string

extension-modulesC modules in the Modules dirC modules in the Modules dir

topic-IO

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

Status: Open.

#151814 In python/cpython;

· pastries-yay opened on Jun 20, 2026

Speed up SimpleHTTPRequestHandler.list_directory() by using os.scandir()

performancePerformance or resource usagePerformance or resource usage

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

triagedThe issue has been accepted as valid by a triager.The issue has been accepted as valid by a triager.

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#151788 In python/cpython;

· mjbommar opened on Jun 20, 2026

IPv4Interface.is_loopback ignores the network prefix, unlike IPv6Interface

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

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

Status: Open.

#151785 In python/cpython;

· aisk opened on Jun 20, 2026