need code in python 3 I have a next list "list":

['1.txt ', '2.txt ', '3.txt ', '2.txt ', '3.txt ', '3.txt ', '4.txt ', '5.txt ', '7.txt ', '3.txt ', '4.txt ', '5.txt ', '7.txt ', '5.txt ', '7.txt ', '6.txt ']

I need create function that checks all list and remove all copies. that means that output of "list"need look like: ['1.txt ', '2.txt ', '3.txt ', '4.txt ', '5.txt ', '7.txt ', '6.txt ']