asset.py 文件源码

def __format_value(cls, value, context, start_key):
        if value is NotImplemented:
            raise NotImplementedError
        if isinstance(value, six.string_types):
            for key in cls._string_format_regex.findall(value):
                if key == start_key:
                    raise errors.ValueSubstitutionInfiniteLoopError
                context[key] = cls.__format_value(
                    context[key], context, start_key)
            return value.format(**context)
        if isinstance(value, Mapping):
            return OrderedDict(
                (k, cls.__format_value(v, context, start_key)) for k, v in value.items())
        if isinstance(value, Sequence):
            return [cls.__format_value(v, context, start_key) for v in value]
        return value