一个关于字典的小问题

wy521@

]统计字符串"thebookisborrowedbyjack”中每个字母的出现次数，将结果保存到一个字典对象中，其中key为字母，value为字母出现的次数，对字典中的数据按照字母出现的次数(value值) 进行排序

wp231957

s="sdluhflqsjidoiqwejfoljsdlkjkaslkdjfjklsdhkweqhfkqwhefksklafglsdfjkashjkldfhklasdhfjksahdfjkhqedhieuwf"
t={}
for x in range(97,123):
    t[chr(x)]=0
  
for x in s:
    t[x]+=1

for x in t:
    if t[x]>0:
        print(x,t[x])

wp231957

还得按value 排序啊

s="sdluhflqsjidoiqwejfoljsdlkjkaslkdjfjklsdhkweqhfkqwhefksklafglsdfjkashjkldfhklasdhfjksahdfjkhqedhieuwf"
t={}
for x in range(97,123):
    t[chr(x)]=0
  
for x in s:
    t[x]+=1

res=sorted(t.items(),key=lambda kv:kv[1],reverse=True)
for x in res:
    if x[1]>0:
      print(x)

('k', 13)
('f', 11)
('d', 10)
('h', 10)
('j', 10)
('l', 10)
('s', 10)
('a', 5)
('e', 5)
('q', 5)
('w', 4)
('i', 3)
('o', 2)
('u', 2)
('g', 1)

wyh551202

希望对你有帮助

#################################方法1用Counter函数
from collections import Counter
str_yuanma='thebookisborrowedbyjack'
count = Counter(str_yuanma)
print(count)
#################################方法2用字符串先转成列表，在用列表统计重复元素放入字典
str_yuanma='thebookisborrowedbyjack'
list=[]
for i in str_yuanma:
    list.append(i)
dict = {}
for key in list:
    dict[key] = dict.get(key, 0) + 1
    # print(list[key])
    # print(dict[key])
print (dict)

ZhKQYu

>>> string = "thebookisborrowedbyjack"
>>> lst = sorted({letter : string.count(letter) for letter in set(string)}.items(), key=lambda x : x[1])
>>> lst
[('d', 1), ('h', 1), ('s', 1), ('c', 1), ('y', 1), ('t', 1), ('i', 1), ('a', 1), ('w', 1), ('j', 1), ('e', 2), ('k', 2), ('r', 2), ('b', 3), ('o', 4)]

临时号

s = 'thebookisborrowedbyjack'
res = {}
for i in s:
    res[i] = s.count(i)
res = sorted(res.items(), key=lambda v: v[1])
print(res)