[已解决]python3中集合的pop()方法到底是不是随机弹出元素

ouyunfu

pop() parameters
The pop() method takes a single argument (index).
The argument passed to the method is optional. If not passed, the default index -1 is passed as an argument (index of the last item).
If the index passed to the method is not in range, it throws IndexError: pop index out of range exception.

也就是说，当不给定位置参数时，默认为-1，即列表最后一个数
举个简单例子

1. l=[1,2,3,4]
   
2. print(l.pop())
   
3. 
   
4. l=[1,2,3,4]
   
5. print(l.pop(-1))

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