Stack (Python)

class Stack:
    def __init__(self, base = []):
        self.__items = base

    def push(self, val):
        self.__items.append(val)

    def pop(self):
        try:
            return self.__items.pop()
        except IndexError:
            print("Stack is empty")

    def top(self):
        try:
            return self.__items[-1]
        except IndexError:
            print("Stack is empty")

    def __len__(self):
        return len(self.__items)

stack = Stack()
stack.push(3)
print(stack.pop())
print(f"length of stack : {len(stack)}")
print(stack.top())

stack = Stack([1, 7])
print(stack.pop())
print(stack.pop())

출처

https://www.youtube.com/watch?v=OzFXiukhv8o&list=PLsMufJgu5933ZkBCHS7bQTx0bncjwi4PK&index=8&ab_channel=Chan-SuShin