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Stack-SequentialStack.py
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executable file
·52 lines (39 loc) · 1.01 KB
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#!/usr/bin/env python3
class Stack:
# 初始化空栈
def __init__(self, size=100):
self.stack = []
self.size = size
self.top = -1
# 判断栈是否为空
def is_empty(self):
return self.top == -1
# 判断栈是否已满
def is_full(self):
return self.top + 1 == self.size
# 入栈操作
def push(self, value):
if self.is_full():
raise Exception('Stack is full')
else:
self.stack.append(value)
self.top += 1
# 出栈操作
def pop(self):
if self.is_empty():
raise Exception('Stack is empty')
else:
self.top -= 1
self.stack.pop()
# 获取栈顶元素
def peek(self):
if self.is_empty():
raise Exception('Stack is empty')
else:
return self.stack[self.top]
S = Stack(10)
for i in range(5):
S.push(i)
for i in range(3):
S.pop()
print(S.peek())