def copy(self, other):
        self.columnlist = other.columnlist
        UnaryOperator.copy(self, other)
Pythonic use of concat
dataset/ETHPy150Open uwescience/raco/raco/algebra.py/Project.copy--crossover with--dataset/ETHPy150Open ReactiveX/RxPY/rx/linq/observable/concat.py/__iadd__