DEP: Minimum supported Python version 3.9

.github/workflows/tests.yaml

@@ -39,7 +39,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11']
         proj-version: ['9.1.0']
         include:
           - python-version: '3.9'
@@ -118,7 +118,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11']
         python-implementation: [python]
         proj-version: ['*']
         include:

appveyor.yml

@@ -13,7 +13,7 @@ environment:
     # See: http://www.appveyor.com/docs/installed-software#python
     # build is limited to 60 minutes, without caching each build takes 10-30 minutes
     # with caching build takes less than 1 minute
-    - PYTHON: "C:\\Python38-x64"
+    - PYTHON: "C:\\Python39-x64"
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       PROJSOURCE: 9.1.0
       BUILD_SHARED_LIBS: ON

docs/history.rst

@@ -4,6 +4,7 @@ Change Log
 Latest
 ------
 - DEP: Minimum PROJ version 9.0 (issue #1223)
+- DEP: Minimum supported Python version 3.9 (issue #1111)
 - ENH: Add `return_back_azimuth: bool` to allow compatibility between the azimuth output of the following functions (issue #1163):
     `fwd` and `fwd_intermediate`, `inv` and `inv_intermediate`,
     Note: BREAKING CHANGE for the default value `return_back_azimuth=True` in the functions `fwd_intermediate` and `inv_intermediate`

docs/index.rst

@@ -7,7 +7,7 @@ GitHub Repository: https://github.com/pyproj4/pyproj
 
 .. note:: Minimum supported PROJ version is 9.0
 
-.. note:: Minimum supported Python version is 3.8
+.. note:: Minimum supported Python version is 3.9
 
 .. note:: Linux (manylinux2014) wheels require pip 19.3+
 

pyproj/__init__.py

@@ -4,7 +4,7 @@
 
 Download: http://python.org/pypi/pyproj
 
-Requirements: Python 3.8+.
+Requirements: Python 3.9+.
 
 Contact:  Jeffrey Whitaker <jeffrey.s.whitaker@noaa.gov>
 

setup.cfg

@@ -18,7 +18,6 @@ classifiers =
     License :: OSI Approved :: MIT License
     Operating System :: OS Independent
     Programming Language :: Python
-    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
@@ -39,7 +38,7 @@ project_urls =
 [options]
 zip_safe = False # https://mypy.readthedocs.io/en/stable/installed_packages.html
 packages = pyproj,pyproj.crs
-python_requires = >=3.8
+python_requires = >=3.9
 install_requires =
     certifi