Python: 3.8+ (#169)

* Python: 3.8+

Python 3.7 went EOL last month.
Time to bump up our supported versions to 3.8+ as well.

* Update CI: Python 3.8+

.github/workflows/ubuntu.yml

@@ -21,7 +21,7 @@ jobs:
     - uses: actions/setup-python@v4
       name: Install Python
       with:
-        python-version: '3.7'
+        python-version: '3.9'
     - name: Dependencies
       run: .github/workflows/dependencies/gcc7.sh
     - name: Build & Install

README.md

@@ -56,7 +56,7 @@ pyAMReX depends on the following popular third party software.
 - [CMake 3.20.0+](https://cmake.org)
 - [AMReX *development*](https://amrex-codes.github.io): we automatically download and compile a copy of AMReX
 - [pybind11](https://github.com/pybind/pybind11/) 2.10.1+: we automatically download and compile a copy of pybind11 ([new BSD](https://github.com/pybind/pybind11/blob/master/LICENSE))
-  - [Python](https://python.org) 3.7+
+  - [Python](https://python.org) 3.8+
   - [Numpy](https://numpy.org) 1.15+
 
 Optional dependencies include:

setup.py

@@ -238,7 +238,7 @@ def build_extension(self, ext):
     ext_modules=cxx_modules,
     cmdclass=cmdclass,
     zip_safe=False,
-    python_requires=">=3.7",
+    python_requires=">=3.8",
     tests_require=["pytest"],
     install_requires=install_requires,
     # cmdclass={'test': PyTest},
@@ -258,7 +258,6 @@ def build_extension(self, ext):
         "Topic :: Software Development :: Libraries",
         "Programming Language :: C++",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",