Chenie21

2021-02-24   阅读量: 37

Python

Python 统计一个英文字符串中每个字符出现的次数


定义字符串转化为list函数strchls

def strchls (str):

list = [] # 集合

i = 0

for w in str:

# print(w)

if w != ' ':

list.append(w)

return list


定义list 转化为字典序列,并把字符作为key(不重复)

def countw(list):

count_word = {}

for w in list:

# j = 1

if w not in count_word.keys():

count_word[w] = 1 # 编号 w:j

else:

count_word[w] += 1 # 编号 w:j

return count_word


函数调用

str = 'how are you'

ls = strchls (str)

print(countw(ls))


方法二

#去空格,转化为list,然后再转化为字典即可


str = 'how are you'

list = []

list2 = []

dict={}

i= 0

for w in str:

if w!=' ':

list.append(w)

# print(list)

for w in list:

c = list.count(w)

dict[w] = c

print(dict)


方法三

直接去空格,转化为字典,利用字典的key值唯一

str = 'how are you'

dict = {}

for w1 in str:

if w1 != ' ':

for w1 in list:

c = list.count(w1)

dict[w1] = c

print(dict)


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