chore: #3847 Update min python version to 3.11

.github/workflows/docs-conda.yml

@@ -22,7 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - python-version: '3.10'
+          - python-version: 3.11
             os: Windows
           - python-version: 3.11
             os: macOS

.github/workflows/docs.yml

@@ -24,7 +24,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.10', 3.11, 3.12]
+        python-version: [3.11, 3.12]
         check-links: [false]
         include:
           - python-version: 3.13

.github/workflows/tests-conda.yml

@@ -28,11 +28,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.10', 3.13]
+        python-version: [3.11, 3.13]
         os: [macOS, Windows]
         include:
-          - python-version: 3.11
-            os: Windows
           - python-version: 3.12
             os: macOS
 

.github/workflows/tests-pypi.yml

@@ -25,13 +25,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.10', 3.11, 3.12, 3.13]
+        python-version: [3.11, 3.12, 3.13]
         dep-versions: [Latest]
         no-extras: ['']
         include:
-          - python-version: '3.10'
+          - python-version: '3.11'
             dep-versions: Minimum
-          - python-version: '3.10'
+          - python-version: '3.11'
             dep-versions: Minimum
             no-extras: 'No Extras'
           - python-version: 3.13

.python-version

@@ -1 +1 @@
-3.10
+3.11

CONTRIBUTING.md

@@ -232,8 +232,9 @@ MetPy documentation via the `gh-pages` branch on GitHub.
 
 Unit tests are the lifeblood of the project, as it ensures that we can continue to add and
 change the code and stay confident that things have not broken. Running the tests requires
-``pytest``, which is easily available through ``conda`` or ``pip``. It was also installed if
-you made our default ``devel`` environment.
+``pytest``, which is easily available through ``conda``, ``pip``, or after installing the
+`test` extras with `uv`. It was also installed if you made our default ``devel`` 
+environment.
 
 ### Running Tests
 

README.md

@@ -32,7 +32,7 @@ on a future ``1.x`` version.
 For additional MetPy examples not included in this repository, please see the
 [MetPy Cookbook on Project Pythia](https://projectpythia.org/metpy-cookbook/index.html).
 
-We support Python >= 3.10.
+We support Python >= 3.11.
 
 Need Help?
 ----------

docs/index.rst

@@ -14,7 +14,7 @@ MetPy
 =====
 
 MetPy is a collection of tools in Python for reading, visualizing, and performing calculations
-with weather data. MetPy supports Python >= 3.10 and is freely available under a permissive
+with weather data. MetPy supports Python >= 3.11 and is freely available under a permissive
 `open source license <https://github.com/Unidata/MetPy/blob/main/LICENSE>`_.
 
 If you're new to MetPy, check out our :doc:`Getting Started <userguide/startingguide>` guide.

docs/userguide/installguide.rst

@@ -7,7 +7,7 @@ Requirements
 ------------
 In general, MetPy tries to support minor versions of dependencies released within the last two
 years. For Python itself, that generally means supporting the last two minor releases; MetPy
-currently supports Python >= 3.10.
+currently supports Python >= 3.11.
 
 .. literalinclude:: ../../pyproject.toml
    :start-at: matplotlib

examples/meteogram_metpy.py

@@ -46,7 +46,7 @@ def __init__(self, fig, dates, probeid, time=None, axis=0):
             axis: number that controls the new axis to be plotted (FOR FUTURE)
         """
         if not time:
-            time = dt.datetime.now(dt.timezone.utc)
+            time = dt.datetime.now(dt.UTC)
         self.start = dates[0]
         self.fig = fig
         self.end = dates[-1]

pyproject.toml

@@ -14,7 +14,6 @@ classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Framework :: Matplotlib",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
@@ -24,7 +23,7 @@ classifiers = [
     "Operating System :: OS Independent",
     "License :: OSI Approved :: BSD License"
 ]
-requires-python = ">=3.10"
+requires-python = ">=3.11"
 dependencies = [
     "matplotlib>=3.5.0",
     "numpy>=1.23.0",

src/metpy/io/metar.py

@@ -5,7 +5,7 @@
 # Import the necessary libraries
 from collections import namedtuple
 import contextlib
-from datetime import datetime, timezone
+from datetime import datetime, UTC
 import warnings
 
 import numpy as np
@@ -433,7 +433,7 @@ def _metars_to_dataframe(metar_iter, *, year=None, month=None):
 
     # Defaults year and/or month to present reported date if not provided
     if year is None or month is None:
-        now = datetime.now(timezone.utc)
+        now = datetime.now(UTC)
         year = now.year if year is None else year
         month = now.month if month is None else month
 

src/metpy/io/nexrad.py

@@ -6,7 +6,7 @@
 import bz2
 from collections import defaultdict, namedtuple, OrderedDict
 import contextlib
-from datetime import datetime, timezone
+from datetime import datetime, UTC
 import logging
 import pathlib
 import re
@@ -76,7 +76,7 @@ def nexrad_to_datetime(julian_date, ms_midnight):
     """Convert NEXRAD date time format to python `datetime.datetime`."""
     # Subtracting one from julian_date is because epoch date is 1
     return datetime.fromtimestamp((julian_date - 1) * day + ms_midnight * milli,
-                                  tz=timezone.utc).replace(tzinfo=None)
+                                  tz=UTC).replace(tzinfo=None)
 
 
 def remap_status(val):

src/metpy/io/text.py

@@ -4,7 +4,7 @@
 """Support reading information from various text file formats."""
 
 import contextlib
-from datetime import datetime, timezone
+from datetime import datetime, UTC
 import re
 import string
 
@@ -102,7 +102,7 @@ def parse_wpc_surface_bulletin(bulletin, year=None):
         text = file.read().decode('utf-8')
 
     parsed_text = []
-    valid_time = datetime.now(timezone.utc).replace(tzinfo=None)
+    valid_time = datetime.now(UTC).replace(tzinfo=None)
     for parts in _regroup_lines(text.splitlines()):
         # A single file may have multiple sets of data that are valid at different times. Set
         # the valid_time string that will correspond to all the following lines parsed, until

src/metpy/plots/_util.py

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 """Utilities for use in making plots."""
 
-from datetime import datetime, timezone
+from datetime import datetime, UTC
 
 from matplotlib.collections import LineCollection
 import matplotlib.patheffects as mpatheffects
@@ -52,7 +52,7 @@ def add_timestamp(ax, time=None, x=0.99, y=-0.04, ha='right', high_contrast=Fals
         text_args = {}
     text_args.update(**kwargs)
     if not time:
-        time = datetime.now(timezone.utc)
+        time = datetime.now(UTC)
     timestr = time.strftime(time_format)
     # If we don't have a time string after that, assume xarray/numpy and see if item
     if not isinstance(timestr, str):

src/metpy/plots/station_plot.py

@@ -371,13 +371,9 @@ def _make_kwargs(self, kwargs):
     def _to_string_list(vals, fmt):
         """Convert a sequence of values to a list of strings."""
         if fmt is None:
-            import sys
-            if sys.version_info >= (3, 11):
-                fmt = 'z.0f'
-            else:
-                def fmt(s):
-                    """Perform default formatting with no decimal places and no negative 0."""
-                    return format(round(s, 0) + 0., '.0f')
+            def fmt(s):
+                """Perform default formatting with no decimal places and no negative 0."""
+                return format(round(s, 0) + 0., '.0f')
         if not callable(fmt):
             def formatter(s):
                 """Turn a format string into a callable."""

src/metpy/remote/aws.py

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 """Tools for reading known collections of data that are hosted on Amazon Web Services (AWS)."""
 import bisect
-from datetime import datetime, timedelta, timezone
+from datetime import datetime, timedelta, UTC
 import itertools
 from pathlib import Path
 import shutil
@@ -18,7 +18,7 @@
 
 def ensure_timezone(dt):
     """Add UTC timezone if no timezone present."""
-    return dt.replace(tzinfo=timezone.utc) if dt.tzinfo is None else dt
+    return dt.replace(tzinfo=UTC) if dt.tzinfo is None else dt
 
 
 class AWSProduct:
@@ -239,7 +239,7 @@ def _build_key(self, site, prod_id, dt, depth=None):
     def dt_from_key(self, key):  # noqa: D102
         # Docstring inherited
         return datetime.strptime(key.split(self.delimiter, maxsplit=2)[-1],
-                                 '%Y_%m_%d_%H_%M_%S').replace(tzinfo=timezone.utc)
+                                 '%Y_%m_%d_%H_%M_%S').replace(tzinfo=UTC)
 
     def get_range(self, site, prod_id, start, end):
         """Yield products within a particular date/time range.
@@ -317,7 +317,7 @@ def get_product(self, site, prod_id, dt=None):
         product_ids, sites, get_range
 
         """
-        dt = datetime.now(timezone.utc) if dt is None else ensure_timezone(dt)
+        dt = datetime.now(UTC) if dt is None else ensure_timezone(dt)
 
         # We work with a list of keys/prefixes that we iteratively find that bound our target
         # key. To start, this only contains the site and product.
@@ -389,7 +389,7 @@ def sites(self, dt=None):
 
         """
         if dt is None:
-            dt = datetime.now(timezone.utc)
+            dt = datetime.now(UTC)
         prefix = self._build_key('', dt, depth=3) + self.delimiter
         return [item.split('/')[-2] for item in self.common_prefixes(prefix)]
 
@@ -401,7 +401,7 @@ def _build_key(self, site, dt, depth=None):
     def dt_from_key(self, key):  # noqa: D102
         # Docstring inherited
         return datetime.strptime(key.rsplit(self.delimiter, maxsplit=1)[-1][4:19],
-                                 '%Y%m%d_%H%M%S').replace(tzinfo=timezone.utc)
+                                 '%Y%m%d_%H%M%S').replace(tzinfo=UTC)
 
     def get_range(self, site, start, end):
         """Yield products within a particular date/time range.
@@ -450,7 +450,7 @@ def get_product(self, site, dt=None):
         sites, get_range
 
         """
-        dt = datetime.now(timezone.utc) if dt is None else ensure_timezone(dt)
+        dt = datetime.now(UTC) if dt is None else ensure_timezone(dt)
         search_key = self._build_key(site, dt)
         prefix = search_key.split('_')[0]
         objs = (self.objects(prefix) if self.include_mdm else
@@ -530,7 +530,7 @@ def _subprod_prefix(self, prefix, mode, band):
     def dt_from_key(self, key):  # noqa: D102
         # Docstring inherited
         start_time = key.split('_')[-3]
-        return datetime.strptime(start_time[:-1], 's%Y%j%H%M%S').replace(tzinfo=timezone.utc)
+        return datetime.strptime(start_time[:-1], 's%Y%j%H%M%S').replace(tzinfo=UTC)
 
     def get_product(self, product, dt=None, mode=None, band=None):
         """Get a product from the archive.
@@ -556,7 +556,7 @@ def get_product(self, product, dt=None, mode=None, band=None):
         product_ids, get_range
 
         """
-        dt = datetime.now(timezone.utc) if dt is None else ensure_timezone(dt)
+        dt = datetime.now(UTC) if dt is None else ensure_timezone(dt)
         time_prefix = self._build_time_prefix(product, dt)
         prod_prefix = self._subprod_prefix(time_prefix, mode, band)
         return self._closest_result(self.objects(prod_prefix), dt)
@@ -645,7 +645,7 @@ def dt_from_key(self, key):  # noqa: D102
         # Docstring inherited
         # GRAP_v100_GFS_2025021212_f000_f240_06.nc
         dt = key.split('/')[-1].split('_')[3]
-        return datetime.strptime(dt, '%Y%m%d%H').replace(tzinfo=timezone.utc)
+        return datetime.strptime(dt, '%Y%m%d%H').replace(tzinfo=UTC)
 
     def get_product(self, model, dt=None, version=None, init=None):
         """Get a product from the archive.
@@ -673,7 +673,7 @@ def get_product(self, model, dt=None, version=None, init=None):
         get_range
 
         """
-        dt = datetime.now(timezone.utc) if dt is None else ensure_timezone(dt)
+        dt = datetime.now(UTC) if dt is None else ensure_timezone(dt)
         model_id = self._model_id(model, version, init)
         search_key = self._build_key(model_id, dt)
         prefix = search_key.rsplit('_', maxsplit=4)[0]