测试工程师面试之算法题字符统计并按照数量大小排序

时间：2020-07-12 22:08:22 收藏：0 阅读：82

python语言：

import re

while True:

try:

line = raw_input()

li = re.findall(r‘[a-zA-z0-9 ]‘, line)

s = ‘‘.join(set(li))

dic = {}

for c in s:

dic[c] = line.count(c)

dli = sorted(dic.iteritems(), key = lambda c: ord(c[0]))

dli = sorted(dli, key = lambda c: c[1], reverse = True)

print ‘‘.join(c[0] for c in dli)

except:

break