方法1
# coding=utf-8
#定義一個字典，將列表重複的字數作為value值，將列表的元素作為鍵值，存入字典中
#打印出字典
#將字典的鍵值轉化成列表2，即完成了列表去重


list1=[1,1,2,2,3,3,3,4,4,4,4,5,5,5,5,6,6,6,11,12,12]


D1={}
count=0
for i in list1:
    count+=1
    D1[i]=count
print("D1=",D1)
list2=list(D1.keys())
print("list2=",list2)


方法2
        
list1=[1,1,2,2,3,3,3,4,4,4,4,5,5,5,5,6,6,6,11,12,12]
list2=list(set(list1))
print("list2",list2)


方法3
list1=[1,1,2,2,3,3,3,4,4,4,4,5,5,5,5,6,6,6,11,12,12]
list2=[]
for i in list1:
    if i not in list2:
        list2.append(i)
print("list2=",list2)