fix: updating pypi workflow with new base version formatting in pyproject.toml (#17366)

.github/workflows/release-pypi-pr.yml

@@ -38,8 +38,11 @@ jobs:
       - name: Generate PR wheel version
         id: gen_version
         run: |
-          # Get base version from version.py
-          BASE_VERSION=$(cat python/sglang/version.py | cut -d'"' -f2)
+          # Get base version from setuptools_scm
+          cd python
+          pip install setuptools-scm
+          BASE_VERSION=$(python -c "from setuptools_scm import get_version; print(get_version(root='..'))" | cut -d'+' -f1)
+          cd ..
 
           # Get commit info
           COMMIT_HASH=$(git rev-parse --short HEAD)
@@ -68,15 +71,17 @@ jobs:
       - name: Update pyproject.toml with PR wheel version
         run: |
           cd python
-          BASE_VERSION=$(cat sglang/version.py | cut -d'"' -f2)
           WHEEL_VERSION="${{ steps.gen_version.outputs.wheel_version }}"
 
-          # Update version (temporary, not committed)
-          sed -i "s/version = \"${BASE_VERSION}\"/version = \"${WHEEL_VERSION}\"/" pyproject.toml
+          # Update pyproject.toml to use static version instead of dynamic
+          # Remove 'version' from dynamic list and add static version
+          sed -i 's/dynamic = \["version"\]/dynamic = []/' pyproject.toml
+          sed -i "/^name = \"sglang\"/a version = \"${WHEEL_VERSION}\"" pyproject.toml
 
           # Verify update
           echo "Updated version in pyproject.toml:"
           grep "^version" pyproject.toml
+          grep "^dynamic" pyproject.toml
 
       - name: Install build dependencies
         run: |