Adapt to tox 4

tox 4 does not install the command in case skipsdist = True is set.

Also, the allowlist_externals option was added in tox 3.18.0 so
the minimum version should be fixed accordingly.

.github/workflows/main.yml

@@ -28,7 +28,7 @@ jobs:
  ${{ runner.os }}-${{ matrix.python-version }}-pip-
  ${{ runner.os }}-${{ matrix.python-version }}
  - name: Install Deps
- run: python -m pip install -U 'tox<4' setuptools virtualenv wheel
+ run: python -m pip install -U tox setuptools virtualenv wheel
  - name: Install and Run Tests
  run: tox -e py
  if: runner.os != 'macOS'
@@ -57,7 +57,7 @@ jobs:
  ${{ runner.os }}-${{ matrix.python-version }}-pip-
  ${{ runner.os }}-${{ matrix.python-version }}-
  - name: Install Deps
- run: python -m pip install -U 'tox<4'
+ run: python -m pip install -U tox
  - name: Run lint
  run: tox -epep8
  cover:
@@ -79,7 +79,7 @@ jobs:
  ${{ runner.os }}-${{ matrix.python-version }}-pip-
  ${{ runner.os }}-${{ matrix.python-version }}-
  - name: Install Deps
- run: python -m pip install -U 'tox<4'
+ run: python -m pip install -U tox
  - name: Run coverxml
  run: tox -ecoverxml
  - name: codecov
@@ -111,7 +111,7 @@ jobs:
  ${{ runner.os }}-pip-
  ${{ runner.os }}-
  - name: Install Deps
- run: python -m pip install -U 'tox<4'
+ run: python -m pip install -U tox
  - name: Build Docs
  run: tox -edocs
  - uses: actions/upload-artifact@v3

tox.ini

@@ -1,7 +1,6 @@
 [tox]
-minversion = 1.6
+minversion = 3.18.0
 envlist = py311,py310,py39,py38,py37,pep8
-skipsdist = True
 
 [testenv]
 usedevelop = True