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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 _check_file(self):
 """ Check if the file exists and has the expected password reference. """

        if not os.path.exists(self.file_path):
            return False
        self._migrate()
        config = configparser.RawConfigParser()
        config.read(self.file_path)
        try:
            config.get(
                escape_for_ini('keyring-setting'),
                escape_for_ini('password reference'),
            )
        except (configparser.NoSectionError, configparser.NoOptionError):
            return False
        try:
            self._check_scheme(config)
        except AttributeError:
            # accept a missing scheme
            return True
        return self._check_version(config)