如何在python列表中将公共元素放在一起？

Question

This might sound like a stupid question but I have the following list:这听起来像是一个愚蠢的问题，但我有以下列表：

list = ['a','b','c','d','a','b','c','d']

And I want to get common elements together to rearrange it as:我想把共同的元素放在一起，把它重新排列为：

sorted_list = ['a','a','b','b','c','c','d','d']

Is there any built in function in python to do that? python中是否有任何内置函数可以做到这一点？

Answer 1

Well to get sorted list you could just use:要获得排序列表，您可以使用：

sorted_list = sorted(list)

which gives the output ['a','a','b','b','c','c','d','d']这给出了输出['a','a','b','b','c','c','d','d']

To sort and group elements by values:要按值对元素进行排序和分组：

list = sorted(list)
sorted_list = [[y for y in list if y==x] for x in list]

which gives the output [['a','a'],['b','b'],['c','c'],['d','d']]这给出了输出[['a','a'],['b','b'],['c','c'],['d','d']]