code: def decrease_perms(self, member, level, **kwargs):
          
  
          input_hash = {}
          input_hash[member] = level
  
          return dxpy.api.project_decrease_permissions(self._dxid,
                                                       input_hash,
                                                       **kwargs)
docs: :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.