string manipulation didn't work on Windows

Author: basnijholt

.github/workflows/tox.yml

@@ -20,17 +20,13 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
-    - name: Set Python version for tox
-      run: echo "PY_VERSION=$(echo py${version//./})" >> $GITHUB_ENV
-      env:
-        version: ${{ matrix.python-version }}
     - name: Register Python problem matcher
       run: echo "::add-matcher::.github/workflows/matchers/pytest.json"
     - name: Install dependencies
       run: pip install tox pytest-github-actions-annotate-failures
     - name: Test with tox using minimal dependencies
-      run: tox -e ${{ env.PY_VERSION }}-mindeps
+      run: tox -e py${{ matrix.python-version }}-mindeps
     - name: Clean
       run: tox -e clean
     - name: Test with tox with all dependencies
-      run: tox -e ${{ env.PY_VERSION }}-alldeps
+      run: tox -e py${{ matrix.python-version }}-alldeps

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 isolated_build = True
-envlist = clean,py{36,37,38,39}-{mindeps,alldeps},report
+envlist = clean,py{3.6,3.7,3.8,3.9}-{mindeps,alldeps},report
 
 [pytest]
 testpaths = adaptive