add python 3.13 support

.github/workflows/ci.yml

@@ -83,7 +83,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest", "macos-latest", "windows-latest"]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy3.9", "pypy3.10"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "pypy3.9", "pypy3.10"]
         exclude:
           - os: "macos-latest"
             python-version: "pypy3.10"
@@ -126,7 +126,7 @@ jobs:
         run: nox -vs integration -p ${{ matrix.python-version }} -- -m "not require_secrets"
       - name: Run integration tests (with secrets)
         # Limit CI workload by running integration tests with secrets only on edge Python versions.
-        if: ${{ env.B2_TEST_APPLICATION_KEY != '' && env.B2_TEST_APPLICATION_KEY_ID != '' && contains(fromJSON('["3.7", "pypy3.10", "3.12"]'), matrix.python-version) }}
+        if: ${{ env.B2_TEST_APPLICATION_KEY != '' && env.B2_TEST_APPLICATION_KEY_ID != '' && contains(fromJSON('["3.8", "pypy3.10", "3.13"]'), matrix.python-version) }}
         run: nox -vs integration -p ${{ matrix.python-version }} -- -m "require_secrets" --cleanup
   test-docker:
     timeout-minutes: 90

changelog.d/+official_python313_support.added.md

@@ -0,0 +1,2 @@
+Declare official support for Python 3.13 in b2sdk.
+Test b2sdk against Python 3.13 in CI.

noxfile.py

@@ -40,6 +40,7 @@
     '3.10',
     '3.11',
     '3.12',
+    '3.13',
 ] if NOX_PYTHONS is None else NOX_PYTHONS.split(',')
 
 
@@ -56,7 +57,7 @@ def _detect_python_nox_id() -> str:
     PYTHON_VERSIONS = [_detect_python_nox_id()]
     print(f"CI job mode; using provided interpreter only; PYTHON_VERSIONS={PYTHON_VERSIONS!r}")
 
-PYTHON_DEFAULT_VERSION = PYTHON_VERSIONS[-1]
+PYTHON_DEFAULT_VERSION = PYTHON_VERSIONS[-2] if len(PYTHON_VERSIONS) > 1 else PYTHON_VERSIONS[0]
 
 PY_PATHS = ['b2', 'test', 'noxfile.py']