python对字符串统计出现次数位列前3的字符

Question

例如输入：
hello world abcaafgaa
输出：
5:a
3:l
2: ,o

Answer 1

s=input()
dict={}
for i in s:
    dict[i]=s.count(i)
count=0
temp=-1
for j in sorted(dict.values(),reverse=True):
    if j!=temp:
        temp=j
    else:
        continue
    print(j,":",sep="",end="")
    l=[]
    for k in dict:
        if dict[k]==j:
            l.append(k)
    print(",".join(sorted(l)))
    count+=1
    if count==3:
        break