Add Python2.7 as installed by default

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
         # see for version: https://github.com/raw/actions/python-versions/main/versions-manifest.json
         # see for runners: https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners#supported-runners-and-hardware-resources
         # If you change this, maybe you need to change the coverage version.
-#        - ["2.7",   "py27", "ubuntu-22.04"]
+        - ["2.7",   "py27", "ubuntu-22.04"]
         - ["pypy2.7",   "pypy", "ubuntu-22.04"]
         - ["3.4.10",   "py34", "ubuntu-18.04"]
         - ["3.5.10",   "py35", "ubuntu-20.04"]
@@ -33,6 +33,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python
+      if: matrix.config[0] != '2.7'
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.config[0] }}