Create tox.ini

tox.ini

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+[tox]
+minversion = 4.4.4
+skip_missing_interpreters = {env:TOX_SKIP_MISSING_INTERPRETERS:True}
+envlist =
+    py37,
+    py38,
+    py39,
+    py310,
+    docs,
+    lint,
+    type,
+isolated_build = true
+
+[testenv]
+description = run the test driver with {basepython}
+passenv =
+    PYTEST_XDIST_WORKER_COUNT
+    PROGRAMDATA
+    PROGRAMFILES(X86)
+    PYTEST_ADDOPTS
+deps = -rtest-requirements.txt
+commands = python -m pytest {posargs}
+
+[testenv:dev]
+description = generate a DEV environment, that has all project libraries
+usedevelop = True
+deps =
+    -rtest-requirements.txt
+    -rdocs/requirements-docs.txt
+commands =
+    python -m pip list --format=columns
+    python -c 'import sys; print(sys.executable)'
+
+[testenv:docs]
+description = invoke sphinx-build to build the HTML docs
+passenv =
+    VERIFY_MYPY_ERROR_CODES
+deps = -rdocs/requirements-docs.txt
+commands =
+    sphinx-build -d "{toxworkdir}/docs_doctree" docs/source "{toxworkdir}/docs_out" --color -W -bhtml {posargs}
+    python -c 'import pathlib; print("documentation available under file://\{0\}".format(pathlib.Path(r"{toxworkdir}") / "docs_out" / "index.html"))'
+
+[testenv:lint]
+description = check the code style
+skip_install = true
+commands = pre-commit run --all-files --show-diff-on-failure
+
+[testenv:type]
+description = type check ourselves
+passenv =
+    TERM
+    MYPY_FORCE_COLOR
+    MYPY_FORCE_TERMINAL_WIDTH
+commands =
+    python -m mypy --config-file mypy_self_check.ini -p mypy -p mypyc
+    python -m mypy --config-file mypy_self_check.ini misc --exclude misc/fix_annotate.py --exclude misc/async_matrix.py --exclude misc/sync-typeshed.py