Support Python 3.12

.github/actions/install-pypi/action.yml

@@ -15,6 +15,10 @@ inputs:
   python-version:
     description: 'What version of Python to use'
     required: true
+  old-build:
+    description: 'Whether to enable old builds for shapely and cartopy'
+    required: false
+    default: 'false'
 
 runs:
   using: composite
@@ -30,13 +34,13 @@ runs:
           ci/extra_requirements.txt
 
     # This installs the stuff needed to build and install Shapely and CartoPy from source.
-    - name: Install CartoPy build dependencies
-      if: ${{ inputs.need-extras == 'true' }}
+    - name: Install CartoPy/Shapely build dependencies
+      if: ${{ inputs.old-build == 'true' }}
       shell: bash
       run: sudo apt-get install libgeos-dev
 
     - name: Disable Shapely Wheels
-      if: ${{ inputs.need-extras == 'true' }}
+      if: ${{ inputs.old-build == 'true' }}
       shell: bash
       run: echo "PIP_NO_BINARY=shapely" >> $GITHUB_ENV
 
@@ -57,6 +61,7 @@ runs:
         -c ci/${{ inputs.version-file }} -c ci/${{ inputs.type }}_requirements.txt -c ci/extra_requirements.txt
 
     - name: Install additional test tools
+      if: ${{ inputs.type == 'test' }}
       shell: bash
       run: >
         python -m pip install coverage

.github/workflows/docs-conda.yml

@@ -28,6 +28,8 @@ jobs:
             os: Windows
           - python-version: 3.11
             os: macOS
+          - python-version: 3.12
+            os: macOS
 
     steps:
     - name: Checkout source

.github/workflows/docs.yml

@@ -22,21 +22,16 @@ jobs:
   # Build our docs on Linux against multiple Pythons
   #
   Docs:
-    name: ${{ matrix.python-version }} ${{ matrix.dep-versions }}
+    name: "Linux ${{ matrix.python-version }}"
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
+        python-version: [3.9, '3.10', 3.11]
+        check-links: [false]
         include:
-          - python-version: 3.9
-            check-links: false
-            dep-versions: requirements.txt
-          - python-version: '3.10'
-            check-links: false
-            dep-versions: requirements.txt
-          - python-version: 3.11
+          - python-version: 3.12
             check-links: true
-            dep-versions: requirements.txt
     outputs:
       doc-version: ${{ steps.build-docs.outputs.doc-version }}
 
@@ -52,6 +47,7 @@ jobs:
       with:
         type: 'doc'
         python-version: ${{ matrix.python-version }}
+        need-extras: true
 
     - name: Build docs
       id: build-docs

.github/workflows/nightly-builds.yml

@@ -14,9 +14,11 @@ on:
       - main
     paths:
       - .github/workflows/nightly-builds.yml
+      - .github/workflows/unstable-builds.yml
   pull_request:
     paths:
       - .github/workflows/nightly-builds.yml
+      - .github/workflows/unstable-builds.yml
 
 jobs:
   Builds:

.github/workflows/tests-conda.yml

@@ -28,8 +28,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.9, '3.10', 3.11]
+        python-version: [3.9, 3.12]
         os: [macOS, Windows]
+        include:
+          - python-version: '3.10'
+            os: macOS
+          - python-version: 3.11
+            os: Windows
 
     steps:
     - name: Checkout source
@@ -66,3 +71,4 @@ jobs:
         uses: codecov/codecov-action@v3
         with:
           name: ${{ github.workflow }}
+          fail_ci_if_error: true

.github/workflows/tests-pypi.yml

@@ -25,7 +25,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.9, '3.10', 3.11]
+        python-version: [3.9, '3.10', 3.11, 3.12]
         dep-versions: [Latest]
         no-extras: ['']
         include:
@@ -34,7 +34,8 @@ jobs:
           - python-version: 3.9
             dep-versions: Minimum
             no-extras: 'No Extras'
-          - python-version: 3.11
+          - python-version: 3.12
+            dep-versions: Latest
             no-extras: 'No Extras'
 
     steps:
@@ -71,6 +72,7 @@ jobs:
         need-extras: ${{ matrix.no-extras != 'No Extras' }}
         type: 'test'
         python-version: ${{ matrix.python-version }}
+        old-build: ${{ matrix.no-extras != 'No Extras' && matrix.dep-versions == 'Minimum' }}
 
     - name: Run tests
       uses: ./.github/actions/run-tests
@@ -94,3 +96,4 @@ jobs:
         uses: codecov/codecov-action@v3
         with:
           name: ${{ github.workflow }}
+          fail_ci_if_error: true

.github/workflows/unstable-builds.yml

@@ -33,7 +33,7 @@ jobs:
         need-extras: true
         type: test
         version-file: Prerelease
-        python-version: 3.11
+        python-version: 3.12
 
     - name: Run tests
       id: tests
@@ -72,7 +72,7 @@ jobs:
       with:
         type: doc
         version-file: Prerelease
-        python-version: 3.11
+        python-version: 3.12
 
     - name: Build docs
       id: build

docs/api/references.rst

@@ -198,11 +198,10 @@ References
 
 .. [WMO8] WMO, 2020: Guide to Meteorological Instruments and Methods of Observation,
            Volume 1: Measurement of Meteorological Variables.
-           `WMO No.8 <https://library.wmo.int/index.php?lvl=notice_display&id=12407>`_.
+           `WMO No.8 <https://library.wmo.int/idurl/4/41650>`_.
 
 .. [WMO306] WMO, 2011: Manual on Codes - International Codes, Volume I.1, Annex II to the WMO
-           Technical Regulations: Part A - Alphanumeric Codes. `WMO No.306
-           <https://library.wmo.int/index.php?lvl=notice_display&id=13617>`_.
+           Technical Regulations: Part A - Alphanumeric Codes. `WMO No.306 <https://library.wmo.int/idurl/4/35713>`_.
 
-.. [WMO1966] WMO, 1966: International Meteorological Tables, `WMO-No. 188.TP.94
-           <https://library.wmo.int/doc_num.php?explnum_id=7997>`_.
+.. [WMO1966] WMO, 1966: International Meteorological Tables,
+           `WMO-No. 188.TP.94 <https://library.wmo.int/idurl/4/59923>`_.

docs/conf.py

@@ -61,8 +61,9 @@
     'reset_modules': [lambda conf, fname: sys.modules.pop('pint', None)]
 }
 
-# By default, only generate all the areas when running in CI
-metpy_generate_all_areas = 'GITHUB_ACTIONS' in os.environ
+# By default, only generate all the areas when running on a release CI job
+metpy_generate_all_areas = (not os.environ.get('GITHUB_REF', '').startswith('refs/pull')
+                            and sys.version_info < (3, 12))
 
 # Turn off code and image links for embedded mpl plots
 plot_html_show_source_link = False
@@ -431,7 +432,9 @@
     r'https://doi\.org/10\.1289/ehp\.1206273',
     # Couldn't fix these 403's with user agents
     r'https://doi\.org/10\.1029/2010GL045777',
-    r'https://doi\.org/10\.1098/rspa\.2004\.1430'
+    r'https://doi\.org/10\.1098/rspa\.2004\.1430',
+    # Currently giving certificate errors on GitHub
+    r'https://library.wmo.int/.*'
     ]
 
 # Dictionary of URL redirects allowed
@@ -440,7 +443,8 @@
     r'https://conda.io/docs/': r'https://conda.io/en/latest/',
     r'https://github.com/Unidata/MetPy/issues/new/choose': r'https://github.com/login.*choose',
     r'https://doi.org/.*': r'https://.*',
-    r'https://gitter.im/Unidata/MetPy': r'https://app.gitter.im/.*MetPy.*'
+    r'https://gitter.im/Unidata/MetPy': r'https://app.gitter.im/.*MetPy.*',
+    r'https://library.wmo.int/idurl/.*': r'https://library.wmo.int/.*'
 }
 
 # Domain-specific HTTP headers for requests

docs/make_areas.py

@@ -52,6 +52,7 @@ def generate_area_file(app):
             if area in states_provinces:
                 code = textwrap.dedent(f"""
                 .. plot::
+                   :context: reset
 
                     import matplotlib.pyplot as plt
                     import cartopy.crs as ccrs
@@ -75,6 +76,7 @@ def generate_area_file(app):
             else:
                 code = textwrap.dedent(f"""
                 .. plot::
+                   :context: reset
 
                     import matplotlib.pyplot as plt
                     import cartopy.crs as ccrs

pyproject.toml

@@ -17,6 +17,7 @@ classifiers = [
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Topic :: Scientific/Engineering",
     "Topic :: Scientific/Engineering :: Atmospheric Science",
     "Intended Audience :: Science/Research",

src/metpy/io/_tools.py

@@ -57,7 +57,7 @@ def open_as_needed(filename, mode='rb'):
         return open(filename, mode, **kwargs)  # noqa: SIM115
 
 
-class NamedStruct(Struct):
+class NamedStruct:
     """Parse bytes using :class:`Struct` but provide named fields."""
 
     def __init__(self, info, prefmt='', tuple_name=None):
@@ -73,7 +73,12 @@ def __init__(self, info, prefmt='', tuple_name=None):
             elif not i[0]:  # Skip items with no name
                 conv_off += 1
         self._tuple = namedtuple(tuple_name, ' '.join(n for n in names if n))
-        super().__init__(prefmt + ''.join(f for f in fmts if f))
+        self._struct = Struct(prefmt + ''.join(f for f in fmts if f))
+
+    @property
+    def size(self):
+        """Return the size of the struct in bytes."""
+        return self._struct.size
 
     def _create(self, items):
         if self.converters:
@@ -90,11 +95,11 @@ def make_tuple(self, *args, **kwargs):
 
     def unpack(self, s):
         """Parse bytes and return a namedtuple."""
-        return self._create(super().unpack(s))
+        return self._create(self._struct.unpack(s))
 
     def unpack_from(self, buff, offset=0):
         """Read bytes from a buffer and return as a namedtuple."""
-        return self._create(super().unpack_from(buff, offset))
+        return self._create(self._struct.unpack_from(buff, offset))
 
     def unpack_file(self, fobj):
         """Unpack the next bytes from a file object."""
@@ -103,12 +108,12 @@ def unpack_file(self, fobj):
     def pack(self, **kwargs):
         """Pack the arguments into bytes using the structure."""
         t = self.make_tuple(**kwargs)
-        return super().pack(*t)
+        return self._struct.pack(*t)
 
 
 # This works around times when we have more than 255 items and can't use
 # NamedStruct. This is a CPython limit for arguments.
-class DictStruct(Struct):
+class DictStruct:
     """Parse bytes using :class:`Struct` but provide named fields using dictionary access."""
 
     def __init__(self, info, prefmt=''):
@@ -118,18 +123,23 @@ def __init__(self, info, prefmt=''):
         # Remove empty names
         self._names = [n for n in names if n]
 
-        super().__init__(prefmt + ''.join(f for f in formats if f))
+        self._struct = Struct(prefmt + ''.join(f for f in formats if f))
+
+    @property
+    def size(self):
+        """Return the size of the struct in bytes."""
+        return self._struct.size
 
     def _create(self, items):
         return dict(zip(self._names, items))
 
     def unpack(self, s):
         """Parse bytes and return a dict."""
-        return self._create(super().unpack(s))
+        return self._create(self._struct.unpack(s))
 
     def unpack_from(self, buff, offset=0):
         """Unpack the next bytes from a file object."""
-        return self._create(super().unpack_from(buff, offset))
+        return self._create(self._struct.unpack_from(buff, offset))
 
 
 class Enum: