gcloud builds operation newly fails using Python 3.10.8, OR-Tools 9.4.1874

[dfoulser]

I am using Python 3.10.8 and an env unchanged since about 2-3 weeks ago, when this command used to work. Now it fails
gcloud builds submit --pack image=gcr.io/solver-28204/poll-scheduler-solver

I'm using ortools 9.4.1874 and numpy 1.23.4 (which I upgraded from 1.23.2 while troubleshooting, to no avail).

I suspect that this has something to do with issue "Python 3.11 support #3515" (google/or-tools#3515) but am stumped on how to fix it. Right now I cannot build the gcloud version of my OR-Tools app.

Any suggestions appreciated.

[builder] Collecting numpy==1.23.4
[builder] Downloading numpy-1.23.4-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (17.1 MB)
[builder] ???????????????????????????????????????? 17.1/17.1 MB 40.3 MB/s eta 0:00:00
[builder] ERROR: Ignored the following versions that require a different python version: 1.21.2 Requires-Python >=3.7,<3.11; 1.21.3 Requires-Python >=3.7,<3.11; 1.21.4 Requires-Python >=3.7,<3.11; 1.21.5 Requires-Python >=3.7,<3.11; 1.21.6 Requires-Python >=3.7,<3.11
[builder] ERROR: Could not find a version that satisfies the requirement ortools==9.4.1874 (from versions: none)
[builder] ERROR: No matching distribution found for ortools==9.4.1874

[matthewrobertson]

I suspect you aren't pinning your python version, so the buildpacks started using python 3.11.0 automatically when it became available last week. You can pin your python version by either:

1. Adding a .python-version file to your application root and specifying a version constraint like:

   3.10.x
   

2. Passing the version constraint via the GOOGLE_PYTHON_VERSION or GOOGLE_RUNTIME_VERSION build environment variables.

See #242 for another person who hit this issue recently.

[dfoulser]

Excellent. That solved it. Thanks.