def add_members(self, new_members):
if isinstance(new_members, string_types) orhasattr(new_members, "<STR_LIT:id>"):<EOL><INDENT>warn("<STR_LIT>")<EOL>new_members = [new_members]<EOL><DEDENT>self._members.update(new_members)<EOL>
Add objects to the group.

Parameters
----------
new_members : list
    A list of cobrapy objects to add to the group.