Python有关类的实例的创建

class node:
    def __init__(self,gas,cost，next):
        self.gas=gas
        self.cost=cost
        self.next=next

请问要怎么用循环创建node的实例啊

class node:
    def __init__(self,gas,cost,next_ = None):
        self.gas=gas
        self.cost=cost
        self.next_=next_
    def __repr__(self):
        return f"gas:{self.gas} cost:{self.cost} next_:{self.next_}"
n1 = node("A1", 'D1')
Root = node('A', 'D', n1)

print(n1)
print(Root)
'''--result
gas:A1 cost:D1 next_:None
gas:A cost:D next_:gas:A1 cost:D1 next_:None
'''