列表的排序和统计。

l1 = [1,2,3,4,2,4,2,6,8]
l2 = list()
# 列表排序
i = 0
for i in l1 :
    if i not in l2 :
        l2.append(i)
print(l2)
#count 统计次数
for i in l1:
    if i not in l2:  #
        l2.append(i)
        l2.append(str(1))
    else:
        l2[l2.index(i) + 1] = str(int(l2[l2.index(i) + 1])+1)
print(l2)
for i in range(0,len(l2),2):
    print(l2[i],l2[i+1],sep=‘----‘)