sessions.py 文件源码

def _tag(value):
    if isinstance(value, tuple):
        return {' t': [_tag(x) for x in value]}
    elif isinstance(value, uuid.UUID):
        return {' u': value.hex}
    elif isinstance(value, bytes):
        return {' b': b64encode(value).decode('ascii')}
    elif callable(getattr(value, '__html__', None)):
        return {' m': text_type(value.__html__())}
    elif isinstance(value, list):
        return [_tag(x) for x in value]
    elif isinstance(value, datetime):
        return {' d': http_date(value)}
    elif isinstance(value, dict):
        return dict((k, _tag(v)) for k, v in iteritems(value))
    elif isinstance(value, str):
        try:
            return text_type(value)
        except UnicodeError:
            from flask.debughelpers import UnexpectedUnicodeError
            raise UnexpectedUnicodeError(u'A byte string with '
                u'non-ASCII data was passed to the session system '
                u'which can only store unicode strings.  Consider '
                u'base64 encoding your string (String was %r)' % value)
    return value