个数英文

Python之统计英⽂字符的个数

⼀、统计英⽂字符的个数

统计英⽂⼉歌《twinkletwinklelittlestar》中，使⽤到的单词及其出现次数。

要求去除单词⼤⼩写的影响，不统计标点符号的个数。并按降序输出。

Twinkle,twinkle,littlestar,HowIwonderwhatyouare!Upabovetheworldsohigh,e,twinkle,

littlestar,HowIwonderwhatyouare!Whentheblazingsunisgone,Whenhenothingshinesupon,Thenyoushowyourlittle

light,

Twinkle,twinkle,e,twinkle,littlestar,HowIwonderwhatyouare!

fromcollectionsimportCounter

sing="Twinkle,twinkle,littlestar,

HowIwonderwhatyouare!

Upabovetheworldsohigh,

Likeadiamondinthesky.

Twinkle,twinkle,littlestar,

HowIwonderwhatyouare!

Whentheblazingsunisgone,

Whenhenothingshinesupon,

Thenyoushowyourlittlelight,

Twinkle,twinkle,allthenight.

Twinkle,twinkle,littlestar,

HowIwonderwhatyouare!"

#处理字符串

lsing=()#将⼤写字母改成⼩写字母

a_sing=e(',','')#将逗号换成空格

b_sing=a_e('!','')#将感叹号换成空格

c_sing=b_e('.','')#将句号换成空格

d_sing=c_()#去掉空格

#统计

dict_sing=Counter(d_sing)

fork,vinsorted(dict_(),key=lambdax:x[1],rever=True):

print(k,v)

⼆、计数函数——Counter

1、举例

colors=[{'red':4},{'blue':5},{'red':8},{'green':7},{'blue':8},{'blue':10},{'green':12}]

⽅法⼀——使⽤⽐较传统的循环⽅法:

colors=[{'red':4},{'blue':5},{'red':8},{'green':7},{'blue':8},{'blue':10},{'green':12}]

result={}

foriincolors:

iflist(())[0]notinresult:

result[list(())[0]]=list(())[0]

el:

result[list(())[0]]+=list(())[0]

print(result)

#结果为：{'red':12,'blue':23,'green':19}

⽅法⼆——Counter函数：

fromcollectionsimportCounter

colors=[{'red':4},{'blue':5},{'red':8},{'green':7},{'blue':8},{'blue':10},{'green':12}]

c=Counter()

foriincolors:

c[list(())[0]]+=list(())[0]

print(c)

#结果为：Counter({'blue':23,'green':19,'red':12})