dictconfig.py 文件源码

def convert(self, value):
        """
        Convert values to an appropriate type. dicts, lists and tuples are
        replaced by their converting alternatives. Strings are checked to
        see if they have a conversion format and are converted if they do.
        """
        if not isinstance(value, ConvertingDict) and isinstance(value, dict):
            value = ConvertingDict(value)
            value.configurator = self
        elif not isinstance(value, ConvertingList) and isinstance(value, list):
            value = ConvertingList(value)
            value.configurator = self
        elif not isinstance(value, ConvertingTuple) and\
                 isinstance(value, tuple):
            value = ConvertingTuple(value)
            value.configurator = self
        elif isinstance(value, six.string_types):  # str for py3k
            m = self.CONVERT_PATTERN.match(value)
            if m:
                d = m.groupdict()
                prefix = d['prefix']
                converter = self.value_converters.get(prefix, None)
                if converter:
                    suffix = d['suffix']
                    converter = getattr(self, converter)
                    value = converter(suffix)
        return value