build: increase minimum supported Python version to 3.8

Python 3.7 is not supported on GitHub Actions ubuntu-latest runner:
actions/setup-python#962

Python 3.7 has reached EOL more than 1 year ago anyway,
so not worth the effort supporting it.

.github/workflows/ci.yml

@@ -223,11 +223,11 @@ jobs:
           - os: macos-latest
             python: pypy3.10
 
-          # Minimum Supported Python Version = 3.7
+          # Minimum Supported Python Version = 3.8
           # This is the minimum version for which manylinux Python wheels are
           # built. Test it with minimum supported Rust version.
           - os: ubuntu-latest
-            python: 3.7
+            python: 3.8
 
     runs-on: ${{ matrix.os }}
     steps:
@@ -277,9 +277,9 @@ jobs:
           - os: macos-latest
             python: pypy3.10
 
-          # Minimum Supported Python Version = 3.7
+          # Minimum Supported Python Version = 3.8
           - os: ubuntu-latest
-            python: 3.7
+            python: 3.8
 
     runs-on: ${{ matrix.os }}
     steps:

deltachat-rpc-client/pyproject.toml

@@ -13,7 +13,6 @@ classifiers = [
     "Operating System :: POSIX :: Linux",
     "Operating System :: MacOS :: MacOS X",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
@@ -24,6 +23,7 @@ classifiers = [
     "Topic :: Communications :: Email"
 ]
 readme = "README.md"
+requires-python = ">=3.8"
 
 [tool.setuptools.package-data]
 deltachat_rpc_client = [

deltachat-rpc-client/src/deltachat_rpc_client/rpc.py

@@ -131,10 +131,7 @@ def __exit__(self, _exc_type, _exc, _tb):
 
     def reader_loop(self) -> None:
         try:
-            while True:
-                line = self.process.stdout.readline()
-                if not line:  # EOF
-                    break
+            while line := self.process.stdout.readline():
                 response = json.loads(line)
                 if "id" in response:
                     response_id = response["id"]
@@ -150,10 +147,7 @@ def reader_loop(self) -> None:
     def writer_loop(self) -> None:
         """Writer loop ensuring only a single thread writes requests."""
         try:
-            while True:
-                request = self.request_queue.get()
-                if not request:
-                    break
+            while request := self.request_queue.get():
                 data = (json.dumps(request) + "\n").encode()
                 self.process.stdin.write(data)
                 self.process.stdin.flush()

python/pyproject.toml

@@ -7,7 +7,7 @@ name = "deltachat"
 version = "1.153.0"
 description = "Python bindings for the Delta Chat Core library using CFFI against the Rust-implemented libdeltachat"
 readme = "README.rst"
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 authors = [
     { name = "holger krekel, Floris Bruynooghe, Bjoern Petersen and contributors" },
 ]

scripts/run_all.sh

@@ -31,6 +31,6 @@ unset CHATMAIL_DOMAIN
 
 # Try to build wheels for a range of interpreters, but don't fail if they are not available.
 # E.g. musllinux_1_1 does not have PyPy interpreters as of 2022-07-10
-tox --workdir "$TOXWORKDIR" -e py37,py38,py39,py310,py311,py312,py313,pypy37,pypy38,pypy39,pypy310 --skip-missing-interpreters true
+tox --workdir "$TOXWORKDIR" -e py38,py39,py310,py311,py312,py313,pypy38,pypy39,pypy310 --skip-missing-interpreters true
 
 auditwheel repair "$TOXWORKDIR"/wheelhouse/deltachat* -w "$TOXWORKDIR/wheelhouse"