剪刀石头布游戏功能优化：限制同一形状输入不超过2次

原代码存在几个问题：全局变量会导致多次调用数据残留、循环内提前return导致只收集一次输入、缺少重复形状次数限制。以下是修复并实现需求的代码：

def getHandOfShapes(size):
    if size < 3:
        print("Please enter a size of at least 3")
        return []
    shapes = []
    for i in range(size):
        while True:
            shape = input(f"Shape {i+1}: please select a shape: ").strip().upper()
            # 检查当前形状是否已出现2次以上
            if shapes.count(shape) >= 2:
                print(f"Cannot have more than 2 {shape}!!")
            else:
                shapes.append(shape)
                break
    return shapes

# 测试示例
print(getHandOfShapes(4))

关键改动说明 #

• 将shapes列表移至函数内部，避免多次调用时的全局数据污染
• 对每一轮输入使用while循环校验：如果当前形状已出现2次，就重复提示输入，直到符合要求
• 移除了原代码中循环内的return，确保完成size次有效输入后再返回结果
• 增加.strip()处理输入的前后空格，提升输入容错性

测试输出示例 #

Shape 1: please select a shape: scissors 
Shape 2: please select a shape: SCISSORS 
Shape 3: please select a shape: scissors 
Cannot have more than 2 SCISSORS!!
Shape 3: please select a shape: Paper 
Shape 4: please select a shape: Stone
['SCISSORS', 'SCISSORS', 'PAPER', 'STONE']

内容的提问来源于stack exchange，提问作者Stainler