Add experimental Python 3.11 support

.github/workflows/continuous-integration.yml

@@ -14,6 +14,7 @@ jobs:
   test:
     name: test
     runs-on: ${{ matrix.os }}
+    continue-on-error: ${{ matrix.experimental }}
     strategy:
       # Allow other matrix jobs to complete if 1 fails
       fail-fast: false
@@ -27,6 +28,16 @@ jobs:
           - ubuntu-latest
           - windows-latest
           - macos-latest
+        include:
+          - python-version: "3.11.0-alpha.3"
+            os: ubuntu-latest
+            experimental: true
+          - python-version: "3.11.0-alpha.3"
+            os: windows-latest
+            experimental: true
+          - python-version: "3.11.0-alpha.3"
+            os: macos-latest
+            experimental: true
 
     steps:
       - uses: actions/checkout@v2
@@ -37,9 +48,9 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - uses: actions-rs/toolchain@v1
-        # Wheels for orjson on Python 3.10 are still spotty on MacOS or Windows. This sets up the Rust
-        # toolchain so we can build the orjson wheel.
-        if: ${{ startsWith(matrix.python-version, '3.10')}}
+        # Wheels for orjson are not available for Python 3.11. This sets up the Rust
+        # toolchain so we can build orjson wheel from source.
+        if: ${{ startsWith(matrix.python-version, '3.11')}}
         with:
           toolchain: stable
           override: true
@@ -140,6 +151,7 @@ jobs:
           - "3.8"
           - "3.9"
           - "3.10"
+          - "3.11.0-alpha.3"
 
     steps:
       - uses: actions/checkout@v2

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 ### Added
 
+- Experimental support for Python 3.11 ([#731](https://github.com/stac-utils/pystac/pull/731))
+
 ### Removed
 
 ### Changed

README.md

@@ -20,6 +20,8 @@ Note that while we support Python 3.10.\*, wheels for the `orjson` library are n
 platforms. If you install PySTAC with the `orjson` extra, you may need to have the Rust toolchain installed (e.g. via [rustup](https://rustup.rs/)) in order to
 build the package from source.
 
+Support for Python 3.11 should be considered experimental until further notice.
+
 PySTAC has a single required dependency (`python-dateutil`).
 PySTAC can be installed from pip or the source repository.
 

setup.py

@@ -42,6 +42,7 @@
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
     ],
     project_urls={
         "Tracker": "https://github.com/stac-utils/pystac/issues",