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

1. s="sdluhflqsjidoiqwejfoljsdlkjkaslkdjfjklsdhkweqhfkqwhefksklafglsdfjkashjkldfhklasdhfjksahdfjkhqedhieuwf"
   
2. t={}
   
3. for x in range(97,123):
   
4.     t[chr(x)]=0
   
5.   
   
6. for x in s:
   
7.     t[x]+=1
   
8. 
   
9. for x in t:
   
10.     if t[x]>0:
    
11.         print(x,t[x])

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wp231957

还得按value 排序啊

1. s="sdluhflqsjidoiqwejfoljsdlkjkaslkdjfjklsdhkweqhfkqwhefksklafglsdfjkashjkldfhklasdhfjksahdfjkhqedhieuwf"
   
2. t={}
   
3. for x in range(97,123):
   
4.     t[chr(x)]=0
   
5.   
   
6. for x in s:
   
7.     t[x]+=1
   
8. 
   
9. res=sorted(t.items(),key=lambda kv:kv[1],reverse=True)
   
10. for x in res:
    
11.     if x[1]>0:
    
12.       print(x)

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('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

1. #################################方法1用Counter函数
   
2. from collections import Counter
   
3. str_yuanma='thebookisborrowedbyjack'
   
4. count = Counter(str_yuanma)
   
5. print(count)
   
6. #################################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
   
7. str_yuanma='thebookisborrowedbyjack'
   
8. list=[]
   
9. for i in str_yuanma:
   
10.     list.append(i)
    
11. dict = {}
    
12. for key in list:
    
13.     dict[key] = dict.get(key, 0) + 1
    
14.     # print(list[key])
    
15.     # print(dict[key])
    
16. print (dict)

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ZhKQYu

1. >>> string = "thebookisborrowedbyjack"
   
2. >>> lst = sorted({letter : string.count(letter) for letter in set(string)}.items(), key=lambda x : x[1])
   
3. >>> lst
   
4. [('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)]

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临时号

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

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