def findByName(self, _name, recurse=False):
        """
        Find and load tests, given C{name}.

        This partially duplicates the logic in C{unittest.loader.TestLoader}.

        @param name: The qualified name of the thing to load.
        @param recurse: A boolean. If True, inspect modules within packages
            within the given package (and so on), otherwise, only inspect
            modules in the package itself.
        """
        if os.sep in _name:
            # It's a file, try and get the module name for this file.
            name = reflect.filenameToModuleName(_name)

            try:
                # Try and import it, if it's on the path.
                # CAVEAT: If you have two twisteds, and you try and import the
                # one NOT on your path, it'll load the one on your path. But
                # that's silly, nobody should do that, and existing Trial does
                # that anyway.
                __import__(name)
            except ImportError:
                # If we can't import it, look for one NOT on the path.
                return self.loadFile(_name, recurse=recurse)

        else:
            name = _name

        obj = parent = remaining = None

        for searchName, remainingName in _qualNameWalker(name):
            # Walk down the qualified name, trying to import a module. For
            # example, `twisted.test.test_paths.FilePathTests` would try
            # the full qualified name, then just up to test_paths, and then
            # just up to test, and so forth.
            # This gets us the highest level thing which is a module.
            try:
                obj = reflect.namedModule(searchName)
                # If we reach here, we have successfully found a module.
                # obj will be the module, and remaining will be the remaining
                # part of the qualified name.
                remaining = remainingName
                break

            except ImportError:
                # Check to see where the ImportError happened. If it happened
                # in this file, ignore it.
                tb = sys.exc_info()[2]

                # Walk down to the deepest frame, where it actually happened.
                while tb.tb_next is not None:
                    tb = tb.tb_next

                # Get the filename that the ImportError originated in.
                filenameWhereHappened = tb.tb_frame.f_code.co_filename

                # If it originated in the reflect file, then it's because it
                # doesn't exist. If it originates elsewhere, it's because an
                # ImportError happened in a module that does exist.
                if filenameWhereHappened != reflect.__file__:
                    raise

                if remaining == "":
                    raise reflect.ModuleNotFound(
                        "The module {} does not exist.".format(name)
                    )

        if obj is None:
            # If it's none here, we didn't get to import anything.
            # Try something drastic.
            obj = reflect.namedAny(name)
            remaining = name.split(".")[len(".".split(obj.__name__))+1:]

        try:
            for part in remaining:
                # Walk down the remaining modules. Hold on to the parent for
                # methods, as on Python 3, you can no longer get the parent
                # class from just holding onto the method.
                parent, obj = obj, getattr(obj, part)
        except AttributeError:
            raise AttributeError("{} does not exist.".format(name))

        return self.loadAnything(obj, parent=parent, qualName=remaining,
                                 recurse=recurse)

        Find and load tests, given C{name}.

        This partially duplicates the logic in C{unittest.loader.TestLoader}.

        @param name: The qualified name of the thing to load.
        @param recurse: A boolean. If True, inspect modules within packages
            within the given package (and so on), otherwise, only inspect
            modules in the package itself.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/trial/runner.py