class Stack:
"""栈, 存放数据的一种容器, 后进先出"""
def __init__(self):
self.__list = []
def push(self, item):
"""添加一个新的元素到栈顶"""
self.__list.append(item)
def pop(self):
"""弹出栈顶元素"""
return self.__list.pop()
def peek(self):
"""返回栈顶元素"""
if self.__list:
return self.__list[-1]
else:
return None
def is_empty(self):
"""判断栈是否为空"""
return self.__list == []
def size(self):
"""返回栈的元素个数"""
return len(self.__list)
if __name__ == '__main__':
s = Stack()
print(s.is_empty())
s.push(1)
s.push(2)
s.push(3)
s.push(4)
print(s.is_empty())
print(s.size())
print(s.pop())
print(s.pop())
print(s.pop())
print(s.pop())
Python stack implemented with the order table ---
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Origin www.cnblogs.com/KX-Lau/p/12498424.html
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