pytest test_mod.py   # run tests in module
pytest somepath      # run all tests below somepath
pytest -k stringexpr # only run tests with names that match the
                      # "string expression", e.g. "MyClass and not method"
                      # will select TestMyClass.test_something
                      # but not TestMyClass.test_method_simple
pytest test_mod.py::test_func  # only run tests that match the "node ID",
                                # e.g. "test_mod.py::test_func" will select
                                # only test_func in test_mod.py
pytest test_mod.py::TestClass::test_method  # run a single method in
                                             # a single class

 pytest
 selenium