Revert "Make the extension work for Python 3.8+."

This reverts commit 3a9939d2ae.

Reason for revert: pybind11 doesn't support `Py_LIMITED_API`;
as per https://github.com/pybind/pybind11/issues/1755, it has
probably never worked and it will probably never work.

Change-Id: Ie603151d31ad07a77d469f0050270d416fe8d21b
Reviewed-on: https://code-review.googlesource.com/c/re2/+/61872
Reviewed-by: Paul Wankadia <junyer@google.com>
Reviewed-by: Alex Chernyakhovsky <achernya@google.com>

.github/workflows/python.yml

@@ -7,7 +7,7 @@ on:
         type: number
 jobs:
   wheel-linux:
-    name: Linux ${{ matrix.os }}, ${{ matrix.arch.name }}
+    name: Linux ${{ matrix.os }}, ${{ matrix.arch.name }}, Python ${{ matrix.ver }}
     runs-on: ${{ matrix.arch.runs-on }}
     container:
       image: quay.io/pypa/${{ matrix.os }}_${{ matrix.arch.python-name }}
@@ -19,16 +19,17 @@ jobs:
           - { name: X64,   python-name: x86_64,  runs-on: [ubuntu-latest]             }
           - { name: ARM64, python-name: aarch64, runs-on: [self-hosted, linux, arm64] }
         os: [manylinux2014, manylinux_2_28]
+        ver: ['3.8', '3.9', '3.10', '3.11']
     env:
       BAZELISK_GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - uses: actions/checkout@v3
       # TODO(junyer): Use `v2` whenever a new release is tagged.
       - uses: bazelbuild/setup-bazelisk@6244971d4f7ba9aca943c2f3ede2bbd813fcca51
-      - name: Prepare Python environment
+      - name: Prepare Python ${{ matrix.ver }} environment
         run: |
-          ln -sf /usr/local/bin/python3.8 /usr/local/bin/python
-          ln -sf /usr/local/bin/python3.8 /usr/local/bin/python3
+          ln -sf /usr/local/bin/python${{ matrix.ver }} /usr/local/bin/python
+          ln -sf /usr/local/bin/python${{ matrix.ver }} /usr/local/bin/python3
           python -m pip install --upgrade pip
           python -m pip install --upgrade build wheel auditwheel
           python -m pip install --upgrade absl-py
@@ -57,7 +58,7 @@ jobs:
           path: python/google_re2-*.whl
           retention-days: 1
   wheel-macos:
-    name: macOS ${{ matrix.os }}, ${{ matrix.arch.name }}
+    name: macOS ${{ matrix.os }}, ${{ matrix.arch.name }}, Python ${{ matrix.ver }}
     runs-on: macos-${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -66,6 +67,7 @@ jobs:
           - { name: X64,   bazel-name: x86_64, python-name: x86_64 }
           - { name: ARM64, bazel-name: arm64,  python-name: arm64  }
         os: [11, 12, 13]
+        ver: ['3.8', '3.9', '3.10', '3.11']
     env:
       BAZELISK_GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       BAZEL_CPU: darwin_${{ matrix.arch.bazel-name }}
@@ -79,8 +81,8 @@ jobs:
       - uses: bazelbuild/setup-bazelisk@6244971d4f7ba9aca943c2f3ede2bbd813fcca51
       - uses: actions/setup-python@v4
         with:
-          python-version: '3.8'
-      - name: Prepare Python environment
+          python-version: ${{ matrix.ver }}
+      - name: Prepare Python ${{ matrix.ver }} environment
         run: |
           python -m pip install --upgrade pip
           python -m pip install --upgrade build wheel delocate
@@ -105,7 +107,7 @@ jobs:
           path: python/google_re2-*.whl
           retention-days: 1
   wheel-windows:
-    name: Windows, ${{ matrix.arch.name }}
+    name: Windows, ${{ matrix.arch.name }}, Python ${{ matrix.ver }}
     runs-on: windows-latest
     strategy:
       fail-fast: false
@@ -113,6 +115,7 @@ jobs:
         arch:
           - { name: X86, bazel-name: x64_x86, python-name: win32     }
           - { name: X64, bazel-name: x64,     python-name: win_amd64 }
+        ver: ['3.8', '3.9', '3.10', '3.11']
     env:
       BAZELISK_GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       BAZEL_CPU: ${{ matrix.arch.bazel-name }}_windows
@@ -132,9 +135,9 @@ jobs:
         shell: bash
       - uses: actions/setup-python@v4
         with:
-          python-version: '3.8'
+          python-version: ${{ matrix.ver }}
           architecture: ${{ env.architecture }}
-      - name: Prepare Python environment
+      - name: Prepare Python ${{ matrix.ver }} environment
         run: |
           python -m pip install --upgrade pip
           python -m pip install --upgrade build wheel delvewheel
@@ -167,8 +170,8 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: '3.8'
-      - name: Prepare Python environment
+          python-version: '3.x'
+      - name: Prepare Python 3.x environment
         run: |
           python -m pip install --upgrade pip
           python -m pip install --upgrade build wheel

python/_re2.cc

@@ -2,10 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// The extension works for Python 3.8+.
-// See https://docs.python.org/3/c-api/stable.html for background.
-#define Py_LIMITED_API 0x03080000
-
 #include <memory>
 #include <string>
 #include <tuple>

python/setup.py

@@ -74,9 +74,6 @@ def options():
     bdist_wheel['plat_name'] = os.environ['PLAT_NAME']
   except KeyError:
     pass
-  # The extension works for Python 3.8+.
-  # See https://docs.python.org/3/c-api/stable.html for background.
-  bdist_wheel['py_limited_api'] = 'cp38'
   return {'bdist_wheel': bdist_wheel}