Add tox.ini for Python testing

tox.ini

@@ -0,0 +1,50 @@
+
+[tox]
+skipsdist = true
+env_list =
+    static
+    coverage
+    py37
+    py38
+    py39
+    py310
+    py311
+    py312
+    pypy3
+
+[testenv]
+commands =
+    python --version
+    python -m unittest discover -t python -s python/tests
+    python python/run_matching.py --verify \
+        tests/graphs/chain_n1000.edge \
+        tests/graphs/chain_n5000.edge \
+        tests/graphs/chain_n10000.edge \
+        tests/graphs/sparse_delta_n1004.edge \
+        tests/graphs/sparse_delta_n2004.edge \
+        tests/graphs/sparse_delta_n5004.edge \
+        tests/graphs/triangles_n1002.edge \
+        tests/graphs/triangles_n5001.edge \
+        tests/graphs/triangles_n10002.edge \
+        tests/graphs/random_n1000_m10000.edge \
+        tests/graphs/random_n2000_m10000.edge \
+        tests/graphs/random_n4000_m10000.edge
+
+[testenv:static]
+deps =
+    mypy
+    pycodestyle
+    pylint
+commands =
+    pycodestyle python/mwmatching python/run_matching.py tests
+    mypy --disallow-incomplete-defs python tests
+    pylint --ignore=test_algorithm.py python tests/*.py tests/generate/*.py
+
+[testenv:coverage]
+deps =
+    coverage
+commands =
+    coverage erase
+    coverage run --branch -m unittest discover -t python -s python/tests
+    coverage report -m
+