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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def read(self, container: Container, filepath: str) -> str: """ Attempts to retrieve the contents of a given file in a running container. Parameters: container: the container from which the file should be fetched. filepath: the path to the file. If a relative path is given, the path will be interpreted as being relative to the source directory for the program under test inside the container. Returns: the contents of the file as a string. Raises: KeyError: if the given file was not found. """

        logger.debug("reading contents of file [%s] in container [%s].",
                     filepath, container.uid)
        path = self._file_path(container, filepath)
        response = self.__api.get(path)
        if response.status_code == 200:
            contents = response.text
            logger.debug("fetched contents of file [%s] in container [%s]:%s",
                         filepath, container.uid,
                         indent("\n[CONTENTS]\n{}\n[/CONTENTS]".format(contents), 2))  # noqa: pycodestyle
            return contents
        try:
            self.__api.handle_erroneous_response(response)
        except BugZooException as err:
            logger.exception("failed to read contents of file [%s] in container [%s]: %s",  # noqa: pycodestyle
                             filepath, container.uid, err)
            raise