Remove support for obsolete python versions

.github/workflows/core.yml

@@ -9,53 +9,23 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-18.04]
-        # TODO: python 2.6
-        python-version: [2.7, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, pypy-2.7, pypy-3.6, pypy-3.7]
-        python-impl: [cpython]
-        ytdl-test-set: [core]
+        python-version: [3.6, 3.7, 3.8, 3.9, pypy-3.6, pypy-3.7]
         run-tests-ext: [sh]
         include:
-        # python 3.2 is only available on windows via setup-python
         - os: windows-latest
-          python-version: 3.2
-          python-impl: cpython
-          ytdl-test-set: core
+          python-version: 3.4  # Windows x86 build is still in 3.4
           run-tests-ext: bat
-        # jython
-        - os: ubuntu-latest
-          python-impl: jython
-          ytdl-test-set: core
-          run-tests-ext: sh
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
-      if: ${{ matrix.python-impl == 'cpython' }}
       with:
         python-version: ${{ matrix.python-version }}
-    - name: Set up Java 8
-      if: ${{ matrix.python-impl == 'jython' }}
-      uses: actions/setup-java@v1
-      with:
-        java-version: 8
-    - name: Install Jython
-      if: ${{ matrix.python-impl == 'jython' }}
-      run: |
-        wget https://repo1.maven.org/maven2/org/python/jython-installer/2.7.1/jython-installer-2.7.1.jar -O jython-installer.jar
-        java -jar jython-installer.jar -s -d "$HOME/jython"
-        echo "$HOME/jython/bin" >> $GITHUB_PATH
     - name: Install nose
-      if: ${{ matrix.python-impl != 'jython' }}
       run: pip install nose
-    - name: Install nose (Jython)
-      if: ${{ matrix.python-impl == 'jython' }}
-      # Working around deprecation of support for non-SNI clients at PyPI CDN (see https://status.python.org/incidents/hzmjhqsdjqgb)
-      run: |
-        wget https://files.pythonhosted.org/packages/99/4f/13fb671119e65c4dce97c60e67d3fd9e6f7f809f2b307e2611f4701205cb/nose-1.3.7-py2-none-any.whl
-        pip install nose-1.3.7-py2-none-any.whl
     - name: Run tests
-      continue-on-error: ${{ matrix.ytdl-test-set == 'download' || matrix.python-impl == 'jython' }}
+      continue-on-error: False
       env:
-        YTDL_TEST_SET: ${{ matrix.ytdl-test-set }}
+        YTDL_TEST_SET: core
       run: ./devscripts/run_tests.${{ matrix.run-tests-ext }}
   # Linter is in quick-test