def METHOD_NAME(self, content):
    """
    Return True if the file type is YAML.
    Return False means this file will be handled in key-value pair format.
    Why 0.9?
        The normal key-value pair format file would always has the '='
        in each line. Use 0.9 rather than 1 here, just in case there're
        any unexpected lines with wrong settings.
    """
    cnt = sum([1 for line in content if "=" in line])
    percent = float(cnt) / len(content)
    return True if percent < 0.9 else False