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"""
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File: stack.py
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Created Time: 2022-11-29
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Author: Peng Chen (pengchzn@gmail.com)
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"""
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""" Driver Code """
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if __name__ == "__main__":
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""" 初始化栈 """
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# Python 没有内置的栈类，可以把 list 当作栈来使用
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stack: list[int] = []
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""" 元素入栈 """
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stack.append(1)
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stack.append(3)
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stack.append(2)
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stack.append(5)
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stack.append(4)
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print("栈 stack =", stack)
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""" 访问栈顶元素 """
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peek: int = stack[-1]
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print("栈顶元素 peek =", peek)
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""" 元素出栈 """
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pop: int = stack.pop()
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print("出栈元素 pop =", pop)
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print("出栈后 stack =", stack)
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""" 获取栈的长度 """
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size: int = len(stack)
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print("栈的长度 size =", size)
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""" 判断是否为空 """
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is_empty: bool = len(stack) == 0
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print("栈是否为空 =", is_empty)
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