Python 3.14 incompatibility

[MilesCranmer]

Affects: Both

Describe the bug

Python 3.14 is now released and seems to introduce the following error at import:

Python 3.14.0 | packaged by conda-forge | (main, Oct  7 2025, 20:20:06) [Clang 20.1.8 ] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import juliacall
[juliapkg] Found dependencies: /Users/mcranmer/PermaDocuments/SymbolicRegressionMonorepo/PySR/tmp/.pixi/envs/default/lib/python3.14/site-packages/juliapkg/juliapkg.json
[juliapkg] Found dependencies: /Users/mcranmer/PermaDocuments/SymbolicRegressionMonorepo/PySR/tmp/.pixi/envs/default/lib/python3.14/site-packages/juliacall/juliapkg.json
Traceback (most recent call last):
  File "<python-input-0>", line 1, in <module>
    import juliacall
  File "/Users/mcranmer/PermaDocuments/SymbolicRegressionMonorepo/PySR/tmp/.pixi/envs/default/lib/python3.14/site-packages/juliacall/__init__.py", line 311, in <module>
    init()
    ~~~~^^
  File "/Users/mcranmer/PermaDocuments/SymbolicRegressionMonorepo/PySR/tmp/.pixi/envs/default/lib/python3.14/site-packages/juliacall/__init__.py", line 178, in init
    CONFIG['exepath'] = juliapkg.executable()
                        ~~~~~~~~~~~~~~~~~~~^^
  File "/Users/mcranmer/PermaDocuments/SymbolicRegressionMonorepo/PySR/tmp/.pixi/envs/default/lib/python3.14/site-packages/juliapkg/deps.py", line 610, in executable
    resolve()
    ~~~~~~~^^
  File "/Users/mcranmer/PermaDocuments/SymbolicRegressionMonorepo/PySR/tmp/.pixi/envs/default/lib/python3.14/site-packages/juliapkg/deps.py", line 475, in resolve
    compat, pkgs = find_requirements()
                   ~~~~~~~~~~~~~~~~~^^
  File "/Users/mcranmer/PermaDocuments/SymbolicRegressionMonorepo/PySR/tmp/.pixi/envs/default/lib/python3.14/site-packages/juliapkg/deps.py", line 351, in find_requirements
    compats[fn + " (OpenSSL_jll)"] = Compat.parse(jc)
                                     ~~~~~~~~~~~~^^^^
  File "/Users/mcranmer/PermaDocuments/SymbolicRegressionMonorepo/PySR/tmp/.pixi/envs/default/lib/python3.14/site-packages/juliapkg/compat.py", line 56, in parse
    if verstr.strip():
       ^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'strip'

cc @cjdoris

[cjdoris]

Ack my earlier fix in juliapkg for Julia 1.12 contained a bug. I'm on it.

On the plus side it means Python 3.14 will work with Julia 1.12!

[cjdoris]

juliapkg 0.1.22 released - two releases in a day! 😄

[MilesCranmer]

Amazing, thank you @cjdoris !! 🫡

[cjdoris]

My pleasure! Please verify it works and close.