一般法，遍历原列表，判断新列表有无此元素，当新列表无此元素时，追加，反之则不追加

     list= [1,234,567,6543,2,4,1,1,12,2,4,5]
     newlist=[]
     a=set(list)
     for i in  a:
         newlist.append(i)
     print(newlist)

利用集合特性唯一性去重

n=["a","b","c","d","a","c","u","o","b","p","b"]
new_n=sorted(list(set(n)))
print(new_n)