Python candidate packages on z/OS
Generated by tools/python_candidate_report.py. The status column is a real pip install on a z/OS system using the zopen wheel index and the published constraints file — not an inference from PyPI metadata, which cannot tell you whether a transitive sdist will build.
Shared blockers
Ranked by how many candidate packages each one blocks. Porting a blocker unblocks every package in its row, so this ordering matters more than the number of times a package was requested.
Lacking a py3-none-any wheel makes something a candidate blocker, not a real one: several such packages build from their sdist on z/OS because the C accelerator is optional and they fall back to pure Python. The last column is the only one that settles it, and it comes from actually installing them.
| blocker | blocks | ported | installs on z/OS? | candidates waiting on it |
|---|---|---|---|---|
cffi | 8 | no | buildbot, msal, paramiko, poetry, pygithub, pynacl, requests-pkcs12, snowflake | |
cryptography | 6 | yes | via zopen wheel | buildbot, msal, paramiko, poetry, requests-pkcs12, snowflake |
pydantic-core | 4 | yes | via zopen wheel | fastapi, fastmcp, pydantic, snowflake |
pyyaml | 4 | yes — builds from sdist | buildbot, cookiecutter, rst2pdf, snowflake | |
pillow | 4 | no | fpdf2, python-pptx, rst2pdf, seaborn | |
markupsafe | 3 | yes — builds from sdist | buildbot, cookiecutter, rst2pdf | |
numpy | 3 | no | PyWavelets, qiskit, seaborn | |
pynacl | 2 | no | paramiko, pygithub | |
msgpack | 2 | no | buildbot, poetry |
Blockers whose answer is "yes — builds from sdist" need no port at all; they only looked like blockers because they ship no universal wheel.
Candidates
| package | status | ported by zopen | native closure still missing |
|---|---|---|---|
buildbot | fails | autobahn, cbor2, cffi, greenlet, markupsafe, msgpack, pyyaml, ujson, zope-interface | |
confluent-kafka | works | yes | — |
cookiecutter | works | yes | backports-zoneinfo, markupsafe, pyyaml |
django | works | yes | — |
duckdb | fails | — | |
fastapi | works | yes | — |
fastmcp | works | yes | — |
fpdf2 | fails | pillow | |
greenlet | fails | — | |
msal | works | cffi | |
ninja | fails | — | |
pamela | installs, import fails | — | |
paramiko | fails | bcrypt, cffi, pynacl | |
poetry | fails | cffi, msgpack, rapidfuzz, xattr | |
psutil | fails | — | |
psycopg2 | fails | — | |
pyarrow | fails | — | |
pycryptodome | fails | — | |
pydantic | works | — | |
pygithub | fails | cffi, pynacl | |
pyjwt | works | — | |
pymqi | fails | — | |
pynacl | fails | cffi | |
pyodbc | fails | — | |
pytest | works | — | |
python-pkcs11 | fails | — | |
python-pptx | fails | lxml, pillow | |
PyWavelets | fails | numpy | |
pyzfile | works | — | |
qiskit | fails | numpy, rustworkx, scipy | |
requests-pkcs12 | works | cffi | |
rst2pdf | fails | markupsafe, pillow, pyyaml | |
seaborn | fails | contourpy, kiwisolver, matplotlib, numpy, pandas, pillow | |
snowflake | fails | cffi, pyyaml, snowflake-connector-python | |
uv | fails | — | |
versioneer | works | yes | — |
xxhash | works | yes | — |
Installs cleanly today
confluent-kafka, cookiecutter, django, fastapi, fastmcp, msal, pydantic, pyjwt, pytest, pyzfile, requests-pkcs12, versioneer, xxhash