def from_json(self, filename, silent=False):
        """Updates the values in the config from a JSON file. This function
        behaves as if the JSON object was a dictionary and passed to the
        :meth:`from_mapping` function.

        :param filename: the filename of the JSON file.  This can either be an
                         absolute filename or a filename relative to the
                         root path.
        :param silent: set to ``True`` if you want silent failure for missing
                       files.

        .. versionadded:: 1.0
        """
        filename = os.path.join(self.root_path, filename)

        try:
            with open(filename) as json_file:
                obj = json.loads(json_file.read())
        except __HOLE__ as e:
            if silent and e.errno in (errno.ENOENT, errno.EISDIR):
                return False
            e.strerror = 'Unable to load configuration file (%s)' % e.strerror
            raise
        return self.from_mapping(obj)
dataset/ETHPy150Open pallets/flask/flask/config.py/Config.from_json