Python列表插入索引

I have an empty python list. and I have for loop that insert elements with index but at random (means indices are chosen randomly to insert the item). I tried a simple example, with randomly select indices, but it works in some indices but others won't work. Below is a simple example of what I wanna do:

a=[]
#a=[]

a.insert(2, '2')
a.insert(5, '5')
a.insert(0, '0')
a.insert(3, '3')
a.insert(1, '1')
a.insert(4, '4')

其输出为a = ['0'，'1'，'2'，'5'，'4'，'3'] 前三个（0,1,2）是正确的，但后三个（'5'，'4'，'3'）是错误的

如何控制插入到具有随机索引的空列表。