indygreg/python-zstandard

Python bindings to the Zstandard (zstd) compression library

Stars: 642
Forks: 116
Open beginner issues: 0
Indexed issues: 65
Avg merge: 1d 14h
Merged PRs (30d): 5

Dominant language: C
License: BSD-3-Clause
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 17, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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65 open issues indexed

`multi_decompress_to_buffer([])` terminates the process with SIGFPE Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

indygreg/python-zstandard#335 · Opened Aug 25, 2026
Add RISE runner capability to repo: riscv64 Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

indygreg/python-zstandard#334 · Opened Aug 13, 2026
Add IBM runner capability to repo: ppc64le s390x Open

Difficulty 3/5 1-2 days Newbie friendliness 54/100

indygreg/python-zstandard#333 · Opened Aug 13, 2026
ZstdDecompressor.decompress: excessive allocation (crash) on 13-byte malformed frame (decompressor.c:335); should raise ZstdError Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

indygreg/python-zstandard#332 · Opened Aug 10, 2026
`ZstdCompressionWriter()` constructs successfully but leads to `segmentation fault` Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

indygreg/python-zstandard#331 · Opened Aug 4, 2026
Segfault in `ZstdCompressorIterator_iternext` with buffer-protocol data Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

indygreg/python-zstandard#303 · 1 comment · Opened May 27, 2026
Modernization roadmap: multi-phase init, stable ABI, free-threading, GC support, deprecated-API cleanup (discussion) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

indygreg/python-zstandard#302 · Opened Apr 19, 2026
CFFI backend parity gaps: garbled `ZstdError` messages, `__exit__` ordering mismatch with C backend, minor parameter-validation drift Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

indygreg/python-zstandard#301 · Opened Apr 19, 2026
GIL held during long-running ZSTD operations: 7 sites (5 EOF compression finalizations + dictionary creation + dict-chain content-size) Open

Difficulty 4/5 3-5 days Newbie friendliness 58/100

indygreg/python-zstandard#300 · Opened Apr 19, 2026
`MemoryError` silently swallowed in 20 sites: 18 `PyObject_HasAttrString` + 2 unguarded `PyErr_Clear` after `PyObject_GetBuffer` (silent data loss in `flush()` / `close()`) Open

Difficulty 4/5 3-5 days Newbie friendliness 62/100

indygreg/python-zstandard#299 · Opened Apr 19, 2026
OOM-path hardening: ~45 sites crash on allocation failure (most critically: `ZstdError` NULL at module init cascades into ~50 error paths) Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

indygreg/python-zstandard#298 · Opened Apr 19, 2026
Fix-propagation gaps: `compressionreader` missing 3 mirrors of fixes previously applied to `decompressionreader` Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

indygreg/python-zstandard#297 · Opened Apr 19, 2026
Memory leaks in stream lifecycle: 4 `__exit__` + 2 `close()` discard CallMethod returns; 5 types leak on `__init__` re-call (~5.5 KB); 2 `Py_buffer` leaks on closed streams Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

indygreg/python-zstandard#296 · Opened Apr 19, 2026
Silent data-correctness bug: `readinto()` / `readinto1()` on `stream_reader` return `tell() == 0` after successful reads Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

indygreg/python-zstandard#295 · Opened Apr 19, 2026
Heap-type refcount imbalance: 19 dealloc sites miss `Py_DECREF(Py_TYPE(self))` + 4 factories bypass `tp_alloc` (type-object leak, latent crash) Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

indygreg/python-zstandard#294 · Opened Apr 19, 2026
SystemError / wrong behavior: 15+ sites conflate error-return sentinels with data (`PyObject_IsTrue`, `PyObject_IsInstance`, `PyLong_AsSsize_t`) Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

indygreg/python-zstandard#293 · Opened Apr 19, 2026
Segfault: 4+ unchecked `PyBytes_AsStringAndSize` on user `read()` return uses uninitialized memory Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

indygreg/python-zstandard#292 · Opened Apr 19, 2026
Segfault: 12 types dereference NULL on `Type.__new__(Type)` without `__init__()` Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

indygreg/python-zstandard#291 · Opened Apr 19, 2026
Add riscv64 (linux_riscv64) wheel to PyPI releases Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

indygreg/python-zstandard#288 · 2 comments · Opened Mar 11, 2026
Support for Python 3.14 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

indygreg/python-zstandard#286 · 2 comments · Opened Jan 14, 2026
Unable to build only cext backend with pep517 builders Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

indygreg/python-zstandard#284 · 3 comments · Opened Oct 25, 2025
Use multi-phase initialisation (PEP 489) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

indygreg/python-zstandard#263 · Opened May 28, 2025
Provide an efficient way to decompress a sequence of chunks compressed with ZstdCompressionChunker Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

indygreg/python-zstandard#259 · Opened Apr 5, 2025
Maintenance support (offer) Open

Difficulty 5/5 Over a week Newbie friendliness 10/100

indygreg/python-zstandard#250 · 1 comment · 7 reactions · Opened Feb 17, 2025
Can't decompress data which is compressed by rust code Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

indygreg/python-zstandard#235 · 5 comments · Opened Aug 12, 2024
AttributeError: module 'zstandard' has no attribute '__version__' Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

indygreg/python-zstandard#230 · 1 comment · Opened Jun 19, 2024
Compiling `zstandard` to WebAssembly Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

indygreg/python-zstandard#227 · 2 comments · 3 reactions · Opened May 24, 2024
No support for MUSL when statically compiled Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

indygreg/python-zstandard#224 · 2 comments · 1 reaction · Opened May 9, 2024
Return True from ZstdDecompressionReader.seekable Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

indygreg/python-zstandard#222 · Opened Apr 22, 2024
Feature request: first class asyncio support Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

indygreg/python-zstandard#215 · 1 reaction · Opened Mar 8, 2024
`fileno` not available on `ZstdDecompressionReader` Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

indygreg/python-zstandard#212 · 1 comment · Opened Dec 14, 2023
Any plans to support the ability to write seekable format files for better random read access? Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

indygreg/python-zstandard#211 · 2 reactions · Opened Dec 6, 2023
`armv7l` (and other arch?) wheels Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

indygreg/python-zstandard#205 · 3 comments · Opened Nov 1, 2023
zstandard.MAGIC_NUMBER returns wrong value on Windows Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

indygreg/python-zstandard#202 · 1 comment · Opened Sep 8, 2023
conda-forge feedstock stuck on 0.19 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

indygreg/python-zstandard#199 · 1 comment · Opened Jul 19, 2023
python-zstandard produces incomplete data after decompress Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

indygreg/python-zstandard#196 · 19 comments · Opened May 2, 2023
stream_reader() hangs (keeps spinning on CPU) when empty buffer is supplied Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 48/100

indygreg/python-zstandard#194 · 3 comments · Opened Apr 27, 2023
FAILED tests/test_module_attributes.py::TestModuleAttributes::test_features fails with --system-zstd Open

Difficulty 2/5 1-3 hours Newbie friendliness 38/100

indygreg/python-zstandard#191 · 2 comments · Opened Feb 17, 2023
Provide runpy invocation in Python lib Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

indygreg/python-zstandard#186 · 1 comment · Opened Nov 14, 2022
Footgun with the `compressobj()` API Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

indygreg/python-zstandard#182 · 2 comments · Opened Sep 16, 2022
No error thrown when there is garbage data past end-of-frame Open

bug enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

indygreg/python-zstandard#181 · 1 comment · Opened Sep 16, 2022
Implement `max_length` argument on `ZstdDecompressionObj::decompress()` Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

indygreg/python-zstandard#176 · Opened Jun 20, 2022
0.17.0: pytest is failing Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

indygreg/python-zstandard#173 · 3 comments · Opened May 21, 2022
environment variable for extra_link_args? Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

indygreg/python-zstandard#170 · Opened Feb 19, 2022
Please add to README how to run tests Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

indygreg/python-zstandard#169 · Opened Jan 19, 2022
ARM64 ERROR: Cannot build on OpenWRT Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

indygreg/python-zstandard#159 · 5 comments · Opened Jul 14, 2021
Feature request: allow `decompress` to decompress stream data without content size in the header Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

indygreg/python-zstandard#150 · 1 comment · 1 reaction · Opened Apr 26, 2021
Test failure on 32-bit Intel-compatible architecture Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

indygreg/python-zstandard#147 · 1 comment · Opened Apr 10, 2021
ImportError: zstd C API versions mismatch; Python bindings were not compiled/linked against expected zstd version (10409 returned by the lib, 10409 hardcoded in zstd headers, 10408 hardcoded in the cext) Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

indygreg/python-zstandard#143 · 2 comments · Opened Mar 8, 2021
It should be possible to ship less wheels Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

indygreg/python-zstandard#142 · 3 comments · 1 reaction · Opened Mar 3, 2021

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