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73 lines
1.6 KiB
73 lines
1.6 KiB
7 months ago
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"""
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File: array_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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class ArrayStack:
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"""Stack class based on array"""
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def __init__(self):
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"""Constructor"""
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self._stack: list[int] = []
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def size(self) -> int:
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"""Get the length of the stack"""
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return len(self._stack)
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def is_empty(self) -> bool:
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"""Determine if the stack is empty"""
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return self.size() == 0
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def push(self, item: int):
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"""Push"""
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self._stack.append(item)
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def pop(self) -> int:
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"""Pop"""
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if self.is_empty():
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raise IndexError("Stack is empty")
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return self._stack.pop()
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def peek(self) -> int:
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"""Access stack top element"""
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if self.is_empty():
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raise IndexError("Stack is empty")
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return self._stack[-1]
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def to_list(self) -> list[int]:
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"""Return array for printing"""
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return self._stack
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"""Driver Code"""
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if __name__ == "__main__":
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# Initialize stack
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stack = ArrayStack()
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# Element push
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stack.push(1)
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stack.push(3)
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stack.push(2)
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stack.push(5)
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stack.push(4)
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print("Stack stack =", stack.to_list())
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# Access stack top element
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peek: int = stack.peek()
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print("Stack top element peek =", peek)
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# Element pop
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pop: int = stack.pop()
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print("Popped element pop =", pop)
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print("Stack after pop =", stack.to_list())
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# Get the length of the stack
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size: int = stack.size()
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print("Stack length size =", size)
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# Determine if it's empty
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is_empty: bool = stack.is_empty()
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print("Is the stack empty =", is_empty)
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