googleapis · ohmayr · Sep 18, 2026 · Sep 17, 2026 · Sep 17, 2026 · Sep 17, 2026
@@ -18,36 +18,9 @@ cd /d %~dp0..\..\..\packages\google-crc32c || goto :error
 
 if "%PUBLISH_WHEELS%"=="" set PUBLISH_WHEELS=true
 
-@echo "Build and Test Wheels"
+@echo "Build, Test, and Publish Wheels"
 call scripts\windows\build.bat || goto :error
 
-@echo "Ensure that we have the latest versions of Twine, Wheel, Setuptools, and pkginfo."
-call py -3 -m pip install --upgrade twine wheel setuptools pkginfo || goto :error
-
-@echo "Build the source distribution (sdist) and validate with twine check"
-call py -3 setup.py sdist || goto :error
-call py -3 -m twine check dist/* wheels/google_crc32c* || goto :error
-
-if "%PUBLISH_WHEELS%"=="true" (
-    @echo "Start the releasetool reporter"
-    call py -3 -m pip install gcp-releasetool || goto :error
-    if not exist C:\temp mkdir C:\temp
-    call py -3 -m releasetool publish-reporter-script > C:\temp\publisher-script || goto :error
-
-    @echo "Disable buffering, so that the logs stream through."
-    set PYTHONUNBUFFERED=1
-
-    @echo "## RELEASE WORKFLOW SUCCESSFUL ##"
-    @echo "## Uploading Wheels and sdist ##"
-
-    set /p TWINE_PASSWORD=<%KOKORO_KEYSTORE_DIR%/73713_google-cloud-pypi-token-keystore-3
-    call py -3 -m twine upload --skip-existing --username __token__ --password "%TWINE_PASSWORD%" dist/* wheels/google_crc32c* || goto :error
-    dir wheels
-    dir dist
-) else (
-    @echo "PUBLISH_WHEELS is '%PUBLISH_WHEELS%'. Skipping PyPI upload after sdist and wheel validation."
-)
-
 goto :EOF
 
 :error

@@ -20,7 +20,16 @@ python -m pip install --upgrade "setuptools<71" twine wheel pkginfo
 echo "Built wheels in ${REPO_ROOT}/wheels/:"
 ls -la "${REPO_ROOT}/wheels/"
 
-for VER in $(awk -F': ' '/^versions:/ {print $2}' "${REPO_ROOT}/scripts/python_versions.yaml"); do
+# If BUILD_PYTHON is specified (single version build), only validate wheels for that version.
+# Otherwise, validate wheels for all versions listed in python_versions.yaml.
+VERSIONS_TO_CHECK=""
+if [[ -n "${BUILD_PYTHON}" ]]; then
+    VERSIONS_TO_CHECK="${BUILD_PYTHON}"
+else
+    VERSIONS_TO_CHECK=$(awk -F': ' '/^versions:/ {print $2}' "${REPO_ROOT}/scripts/python_versions.yaml")
+fi
+
+for VER in ${VERSIONS_TO_CHECK}; do
     SHORT=$(echo "$VER" | cut -d. -f1,2)
     ABI="cp${SHORT//.}-cp${SHORT//.}"
     for ARCH in x86_64 aarch64; do

@@ -44,13 +44,19 @@ fi
 # wheels compatible with older macOS releases.
 PYTHON_EXE="/Library/Frameworks/Python.framework/Versions/${PY_BIN}/bin/python${PY_BIN}"
 if [[ ! -x "${PYTHON_EXE}" ]]; then
-    PKG_NAME="python-${PY_VERSION}-macos11.pkg"
-    echo "Installing Python ${PY_VERSION} from python.org (${PKG_NAME})..."
-    curl --fail --show-error --location --retry 5 --retry-delay 5 --retry-all-errors \
-        --output "/tmp/${PKG_NAME}" \
-        "https://www.python.org/ftp/python/${PY_VERSION}/${PKG_NAME}"
-    sudo installer -pkg "/tmp/${PKG_NAME}" -target /
-    rm -f "/tmp/${PKG_NAME}"
+    if command -v "python${PY_BIN}" >/dev/null 2>&1; then
+        PYTHON_EXE=$(command -v "python${PY_BIN}")
+    else
+        PKG_NAME="python-${PY_VERSION}-macos11.pkg"
+        # Pre-releases (a1/b1/rc1) are placed under the base version directory on python.org (e.g. 3.15.0a1 -> 3.15.0)
+        FTP_DIR="${PY_VERSION%%[a-z]*}"
+        echo "Installing Python ${PY_VERSION} from python.org (${PKG_NAME})..."
+        curl --fail --show-error --location --retry 5 --retry-delay 5 --retry-all-errors \
+            --output "/tmp/${PKG_NAME}" \
+            "https://www.python.org/ftp/python/${FTP_DIR}/${PKG_NAME}"
+        sudo installer -pkg "/tmp/${PKG_NAME}" -target /
+        rm -f "/tmp/${PKG_NAME}"
+    fi
 fi
 "${PYTHON_EXE}" --version
 

@@ -19,4 +19,4 @@
 # https://www.python.org/ftp/python/<version>/python-<version>-macos11.pkg
 # and Windows installs the matching Chocolatey package.
 # Linux (manylinux) and the wheel ABI tags only use the major.minor part.
-versions: 3.10.11 3.11.9 3.12.10 3.13.15 3.14.7
+versions: 3.10.11 3.11.9 3.12.10 3.13.15 3.14.7 3.15.0rc2
@@ -27,14 +27,21 @@ set CRC32C_INSTALL_PREFIX=%cd%\build\%CONFIGURATION%
 @rem installer seems to have some problems with installing multiple versions at
 @rem once, so as a workaround, we will install and then uninstall every version.
 for /f "tokens=2 delims=:" %%A in ('findstr /b "versions:" "%~dp0..\python_versions.yaml"') do set SUPPORTED_PYTHON_VERSIONS=%%A
+@rem Set PY_PYTHON3 to the first (lowest supported) version in python_versions.yaml so py -3 uses a stable version.
+for /f "tokens=1 delims= " %%V in ("%SUPPORTED_PYTHON_VERSIONS%") do for /f "tokens=1,2 delims=." %%I in ("%%V") do set PY_PYTHON3=%%I.%%J
 FOR %%P IN (%SUPPORTED_PYTHON_VERSIONS%) DO (
     set python_version=%%P
     for /f "tokens=1,2 delims=." %%I in ("%%P") do set python_version_trimmed=%%I.%%J
 
     for /L %%R in (1,1,5) do (
         py -!python_version_trimmed!-64 --version >nul 2>&1 || (
             echo "Installing Python version %%P (attempt %%R/5)"
-            choco install python --version=%%P -y --no-progress || (
+            @rem Format pre-release version for Chocolatey (e.g. 3.15.0a1 -> 3.15.0-a1)
+            set CHOCO_VER=%%P
+            set CHOCO_VER=!CHOCO_VER:0a=0-a!
+            set CHOCO_VER=!CHOCO_VER:0b=0-b!
+            set CHOCO_VER=!CHOCO_VER:0rc=0-rc!
+            choco install python --version=!CHOCO_VER! --pre -y --no-progress || (
                 echo "choco install %%P failed; retrying in 15s..."
                 py -3 -c "import time; time.sleep(15)"
             )
@@ -101,8 +108,31 @@ for %%P in (%SUPPORTED_PYTHON_VERSIONS%) do (
 )
 
 echo "Validating built wheels with twine check"
-py -3 -m pip install --upgrade twine wheel pkginfo || goto :error
-py -3 -m twine check wheels/* || goto :error
+py -3 -m pip install --upgrade twine wheel setuptools pkginfo || goto :error
+
+echo "Build the source distribution (sdist) and validate with twine check"
+py -3 setup.py sdist || goto :error
+py -3 -m twine check dist/* wheels/* || goto :error
+
+if "%PUBLISH_WHEELS%"=="true" (
+    echo "Start the releasetool reporter"
+    py -3 -m pip install gcp-releasetool || goto :error
+    if not exist C:\temp mkdir C:\temp
+    py -3 -m releasetool publish-reporter-script > C:\temp\publisher-script || goto :error
+
+    echo "Disable buffering, so that the logs stream through."
+    set PYTHONUNBUFFERED=1
+
+    echo "## RELEASE WORKFLOW SUCCESSFUL ##"
+    echo "## Uploading Wheels and sdist ##"
+
+    set /p TWINE_PASSWORD=<%KOKORO_KEYSTORE_DIR%/73713_google-cloud-pypi-token-keystore-3
+    py -3 -m twine upload --skip-existing --username __token__ --password "%TWINE_PASSWORD%" dist/* wheels/* || goto :error
+    dir wheels
+    dir dist
+) else (
+    echo "PUBLISH_WHEELS is '%PUBLISH_WHEELS%'. Skipping PyPI upload after sdist and wheel validation."
+)
 
 goto :EOF