def decrease_perms(self, member, level, **kwargs):
        """
        :param member: Username (of the form "user-USERNAME") of the project member whose permissions will be decreased.
        :type member: string
        :param level: Permissions level that the member will have after this operation (None, "VIEW", "UPLOAD", or "CONTRIBUTE")
        :type level: string or None

        Decreases the permissions that the specified user has in the project.

        """

        input_hash = {}
        input_hash[member] = level

        return dxpy.api.project_decrease_permissions(self._dxid,
                                                     input_hash,
                                                     **kwargs)