def load(self) -> None:
        """Load previously-collected coverage data from the data file."""
        self._init()
        if self._collector is not None:
            self._collector.reset()
        should_skip = self.config.parallel and not os.path.exists(self.config.data_file)
        if not should_skip:
            self._init_data(suffix=None)
        self._post_init()
        if not should_skip:
            assert self._data is not None
            self._data.read()
Load previously-collected coverage data from the data file.
coverage/control.py