Fix python 2.7 install

Author: ddelange

.github/workflows/CI.yml

@@ -13,16 +13,25 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [2.7, 3.4, 3.5, 3.6, 3.7, 3.8]
+        python-version: ['2.7', '3.x']
 
     steps:
     - uses: actions/checkout@v2
       with:
         fetch-depth: 0
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      if: matrix.python-version != '2.7'
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
+    - name: Set up Python 2
+      if: matrix.python-version == '2.7'
+      run: |
+        sudo rm -f $(which python) $(which pip)
+        sudo apt-get install python2.7-dev
+        curl https://bootstrap.pypa.io/pip/2.7/get-pip.py -o get-pip.py
+        python2.7 get-pip.py
+        sudo ln -sf "$(which python2.7)" "$(dirname $(which python2.7))/python"
     - name: Install dependencies
       run: |
         pip install -U pip setuptools wheel