python统计英文首字母出现的次数

文章由Byrx.net分享于2019-03-22 02:03:16评论（634）

使用python解析有道词典导出的xml格式单词，统计各个首字母出现的次数，并按次数由多到少进行排序

相关实现

导出的xml格式如下

<item>

<word>portion</word>

</item>

</wordbook>

使用python3自带的xml解析器进行解析，使用字典进行保存统计结果

import time

import xml.etree.ElementTree as et

# get all word

def get_all_word(uri):

tree = et.parse(uri)

root = tree.getroot()

return root.findall('./item/word')

# calculate the first letter frequency of words

def cal_aleph(word_list):

# define dwords to save first letter count

dwords = {}

for cword in word_list:

letter = cword.text.strip()[0].lower()

# judge the letter is english letter

echar = ord(letter)

if(echar >= 97 and echar <= 122):

try:

dwords[letter] += 1

except KeyError:

dwords[letter] = 1;

# order by count desc

dwords = sorted(dwords.items(), key=lambda line:line[1], reverse=True)

return dwords

if __name__ == '__main__':

start_time = time.time()

word_list = get_all_word(r'd:\pyzone\youdao.xml')

result = cal_aleph(word_list)

for row in result:

print("%s : %d"%(row[0], row[1]))

end_time = time.time()

print('Costed time: ' + str((end_time - start_time)) + 's')

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