Partially revert #8042 and add CI in order to allow Python 3.12 support.

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
   check:
     uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@v1
     with:
-      default_python: "3.11"
+      default_python: "3.12"
       envs: |
         - linux: check-style
         - linux: check-security
@@ -70,10 +70,11 @@ jobs:
         - linux: py39-sdpdeps-xdist
         - linux: py310-xdist
         - linux: py311-xdist
+        - linux: py312-xdist
         - macos: py311-xdist
           pytest-results-summary: true
         - linux: py311-stdevdeps-xdist
-        - linux: py311-devdeps-xdist
+        - linux: py312-devdeps-xdist
         - linux: py311-xdist-cov
           coverage: codecov
           pytest-results-summary: true

.github/workflows/ci_cron.yml

@@ -46,12 +46,13 @@ jobs:
         - macos: py39-xdist
         - macos: py39-sdpdeps-xdist
         - macos: py310-xdist
+        - macos: py312-xdist
         - windows: py311-xdist
           pytest-results-summary: true
         - linux: py311-pyargs-xdist
-        - linux: py311-devdeps-xdist
+        - linux: py312-devdeps-xdist
           pytest-results-summary: true
-        - macos: py311-devdeps-xdist
+        - macos: py312-devdeps-xdist
           pytest-results-summary: true
-        - windows: py311-devdeps-xdist
+        - windows: py312-devdeps-xdist
           pytest-results-summary: true

CHANGES.rst

@@ -39,14 +39,14 @@ extract_2d
 general
 -------
 
-- Add lack of python 3.12 support to project metadata [#8042]
-
 - Increase asdf maximum version to 4. [#8018]
 
 - Remove upper version limit for scipy. [#8033]
 
 - Remove the use of ``pkg_resources`` by ``jwst``. [#8095]
 
+- Fix Python 3.12 support. [#8093]
+
 outlier_detection
 -----------------
 

README.md

@@ -9,10 +9,7 @@
 
 ![STScI Logo](docs/_static/stsci_logo.png)
 
-### JWST requires a C compiler for dependencies, and is currently limited to Python 3.9, 3.10 or 3.11.
-
-**Until Python 3.12 is supported, fresh conda environments will require setting the
-  python version to one of the three supported versions.**
+**JWST requires Python 3.9 or above and a C compiler for dependencies.**
 
 **Linux and MacOS platforms are tested and supported.  Windows is not currently supported.**
 
@@ -53,13 +50,13 @@ Remember that all conda operations must be done from within a bash/zsh shell.
 
 You can install the latest released version via `pip`.  From a bash/zsh shell:
 
-    conda create -n <env_name> python=3.11
+    conda create -n <env_name> python
     conda activate <env_name>
     pip install jwst
 
 You can also install a specific version:
 
-    conda create -n <env_name> python=3.11
+    conda create -n <env_name> python
     conda activate <env_name>
     pip install jwst==1.9.4
 
@@ -68,7 +65,7 @@ You can also install a specific version:
 You can install the latest development version (not as well tested) from the
 Github master branch:
 
-    conda create -n <env_name> python=3.11
+    conda create -n <env_name> python
     conda activate <env_name>
     pip install git+https://github.com/spacetelescope/jwst
 
@@ -120,7 +117,7 @@ already installed with released versions of the `jwst` package.
 
 As usual, the first two steps are to create and activate an environment:
 
-    conda create -n <env_name> python=3.11
+    conda create -n <env_name> python
     conda activate <env_name>
 
 To install your own copy of the code into that environment, you first need to

jwst/jump/jump_step.py

@@ -4,9 +4,12 @@
 from ..stpipe import Step
 from .jump import run_detect_jumps
 import time
+import multiprocessing
 
 __all__ = ["JumpStep"]
 
+multiprocessing.set_start_method('forkserver', force=True)
+
 
 class JumpStep(Step):
     """

jwst/ramp_fitting/ramp_fit_step.py

@@ -18,10 +18,13 @@
 import logging
 import copy
 import warnings
+import multiprocessing
 
 log = logging.getLogger(__name__)
 log.setLevel(logging.DEBUG)
 
+multiprocessing.set_start_method('forkserver', force=True)
+
 
 __all__ = ["RampFitStep"]
 

setup.cfg

@@ -18,14 +18,14 @@ classifiers =
     Operating System :: POSIX
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3 :: Only
-    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
 
 [options]
 zip_safe = False
-python_requires = >=3.9,<3.12
+python_requires = >=3.9
 setup_requires =
     setuptools_scm
 install_requires =