Drop python 3.7 support

EOL and no walrus operator

.github/workflows/build_and_publish.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        pyver: [cp37, cp38, cp39, cp310, cp311, cp312]
+        pyver: [cp38, cp39, cp310, cp311, cp312]
     steps:
       - name: Checkout
         uses: actions/checkout@v4

README.md

@@ -17,7 +17,7 @@ functionalities in robot manipulation.
 
 ## Installation
 
-Pre-built pip packages support Ubuntu 18.04+ with Python 3.7+.
+Pre-built pip packages support Ubuntu 20.04+ with Python 3.8+.
 
 ```
 pip install mplib

dev/build_wheels.sh

@@ -83,13 +83,13 @@ fi
 
 if [ "$PY_VERSION" == "all" ]; then
   # python3 -m cibuildwheel --platform linux
-  for PY_VERSION in 37 38 39 310 311 312; do
+  for PY_VERSION in 38 39 310 311 312; do
     build_wheel
   done
 else
   # CIBW_BUILD="cp${PY_VERSION}-*" python3 -m cibuildwheel --platform linux
   case "$PY_VERSION" in
-    37|38|39|310|311|312) ;;
+    38|39|310|311|312) ;;
     *)
       echo "Error: Python version($PY_VERSION) not supported" >&2
       exit 4

pyproject.toml

@@ -6,7 +6,7 @@ build-backend = "setuptools.build_meta"
 name = "mplib"
 dynamic = ["version"]
 dependencies = ["numpy", "toppra >= 0.4.0", "transforms3d >= 0.3.1"]
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 authors = [
   {name="Minghua Liu", email = "[email protected]"},
   {name="Jiayuan Gu", email="[email protected]"},
@@ -31,8 +31,6 @@ classifiers=[
   "Natural Language :: English",
   "Framework :: Robot Framework :: Tool",
   "Programming Language :: C++",
-  "Programming Language :: Python :: 3.6",
-  "Programming Language :: Python :: 3.7",
   "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",