config.py 文件源码

def __init__(self, stream):
        """Initialise Loader."""
        try:
            self._root = os.path.split(stream.name)[0]
        except AttributeError:
            self._root = os.path.curdir
        super().__init__(stream)
        self.add_implicit_resolver(
            u'tag:yaml.org,2002:float',
            re.compile(u'''^(?:
             [-+]?(?:[0-9][0-9_]*)\\.[0-9_]*(?:[eE][-+]?[0-9]+)?
            |[-+]?(?:[0-9][0-9_]*)(?:[eE][-+]?[0-9]+)
            |\\.[0-9_]+(?:[eE][-+][0-9]+)?
            |[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*
            |[-+]?\\.(?:inf|Inf|INF)
            |\\.(?:nan|NaN|NAN))$''', re.X),
            list(u'-+0123456789.'))
        self.filenames = [os.path.abspath(stream.name)]