Method setdefault

pattern/vector/__init__.py:153–156

(self, k, default=None)

    def update(self, kv):
        raise ReadOnlyError
    def setdefault(self, k, default=None):
        if k in self: 
            return self[k]
        raise ReadOnlyError

# Read-only list, used for Model.documents.
class readonlylist(list):