How to use the pydocstyle.checker.ConventionChecker function in pydocstyle

def run(self, found_files):
        messages = []

        checker = PEP257Checker()

        for code_file in found_files.iter_module_paths():
            try:
                for error in checker.check_source(
                    read_py_file(code_file),
                    code_file,
                    None
                ):

                    location = Location(
                        path=code_file,
                        module=None,
                        function='',
                        line=error.line,
                        character=0,
                        absolute_path=True,