定义一个随机混排给定列表的元素值的函数shuffle,shuffle调用函数一一可以换给定列表中两个指定下标的元素值(exchange)python
时间: 2024-09-14 13:15:03 浏览: 62
在Python中,你可以使用内置的`random`模块来创建一个名为`shuffle_and_exchange`的函数,它会随机交换列表中两个指定位置的元素。这里是一个简单的示例:
```python
import random
def shuffle_and_exchange(lst, index1, index2):
# 检查索引是否有效
if not (0 <= index1 < len(lst)) or not (0 <= index2 < len(lst)):
raise IndexError("索引超出列表范围")
# 随机选择两个元素进行交换
random_index = random.randint(0, len(lst) - 1)
temp = lst[index1]
lst[index1] = lst[random_index] # 把随机元素放到index1的位置
lst[random_index] = temp # 把原来index1的元素放到随机位置
# 如果需要交换的具体索引是相同的,再次随机选取
if index1 == index2:
random_index = random.randint(0, len(lst) - 1)
temp = lst[index1]
lst[index1] = lst[random_index]
lst[random_index] = temp
return lst
# 示例用法
my_list = [1, 2, 3, 4, 5]
print(shuffle_and_exchange(my_list, 0, 2))
```
这个函数首先检查索引是否合法,然后生成一个随机索引,将该随机索引对应的元素与第一个指定索引的元素互换。如果随机索引与指定索引相同,为了保证真正交换两个不同位置的元素,会再次随机选择。
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