02-stack

class :
    def __init__(self,value):
        self.value = value
        self.next = None
class Stack:
    def __init__(self):
        self.top = None
    def push(self,value):
        node = Node(value)
        node.next = self.top
        self.top = node
    def pop(self):
        node = self.top
        self.top = node.next
        return node.value
if __name__ == '__main__':
    stack = Stack()
    for i in range(10):
        stack.push(i)
    while stack.top:
        print(stack.pop())