MNT: Bump minimum Python to 3.7 (Closes Unidata#1546)

.github/workflows/docs-conda.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   #
-  # Build our docs on macOS and Windows on Python 3.6 and 3.7, respectively.
+  # Build our docs on macOS and Windows on Python 3.8 and 3.7, respectively.
   #
   Docs:
     name: ${{ matrix.os }} ${{ matrix.python-version }}
@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - python-version: 3.6
+          - python-version: 3.8
             os: macOS
           - python-version: 3.7
             os: Windows
@@ -55,11 +55,6 @@ jobs:
         # Needed for caching
         use-only-tar-bz2: true
 
-    # TODO: Remove this when we drop Python 3.6
-    - name: Adjust traitlets dependency for Python 3.6
-      if: ${{ matrix.python-version == 3.6 }}
-      run: sed -e "s/traitlets==.*/traitlets==4.3.3/" -i.bak ci/requirements.txt
-
     # TODO: Remove this when scipy>1.5.3 is available on conda-forge
     - name: Adjust scipy dependency for Conda
       run: sed -e "s/scipy==.*/scipy==1.5.3/" -i.bak ci/requirements.txt

.github/workflows/tests-pypi.yml

@@ -18,11 +18,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
         dep-versions: [requirements.txt]
         no-extras: ['']
         include:
-          - python-version: 3.6
+          - python-version: 3.7
             dep-versions: Minimum
             no-extras: ''
           - python-version: 3.9
@@ -63,11 +63,6 @@ jobs:
           pip-tests-${{ runner.os }}-
           pip-tests-
 
-    # TODO: Remove this when we drop Python 3.6
-    - name: Adjust traitlets dependency for Python 3.6
-      if: ${{ matrix.python-version == 3.6 }}
-      run: sed -e "s/traitlets==.*/traitlets==4.3.3/" -i.bak ci/requirements.txt
-
     - name: Add extras to requirements
       if: ${{ matrix.no-extras != 'No Extras' }}
       run: cat ci/extra_requirements.txt >> ci/test_requirements.txt

README.md

@@ -30,11 +30,7 @@ on a future ``1.x`` version.
 For additional MetPy examples not included in this repository, please see the [Unidata Python
 Gallery](https://unidata.github.io/python-gallery/).
 
-We support Python >= 3.6.
-
-0.12 is the first version to drop support for Python 2.7 in Fall 2019. See
-[here](https://github.com/Unidata/MetPy/blob/main/docs/installguide.rst) for more
-information.
+We support Python >= 3.7.
 
 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 >= 3.6 and is freely available under a permissive
+with weather data. MetPy supports Python >= 3.7 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 >= 3.6.
+currently supports Python >= 3.7.
 
 * matplotlib >= 2.1.0
 * numpy >= 1.16.0

setup.cfg

@@ -15,7 +15,6 @@ classifiers =
     Development Status :: 5 - Production/Stable
     Framework :: Matplotlib
     Programming Language :: Python
-    Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
@@ -38,7 +37,7 @@ package_dir =
 packages = find:
 include_package_data = True
 setup_requires = setuptools_scm
-python_requires = >=3.6
+python_requires = >=3.7
 install_requires =
     importlib_metadata>=1.0.0; python_version < '3.8'
     importlib_resources>=1.3.0; python_version < '3.9'

setup.py

@@ -9,7 +9,7 @@
 
 if sys.version_info[0] < 3:
     error = """
-    MetPy v0.12 and greater requires the Python 3.6 or above.
+    MetPy v1.1 and greater requires Python 3.7 or above.
     If you're using Python 2.7, please install MetPy v0.11.1,
     which is the last release of MetPy that supports Python 2.7,
     but it is no longer maintained.