python统计英文首字母出现的次数

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

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

<wordbook> <item> <word>portion</word> <trans><![CDATA[n. 部分；一份；命运vt. 分配；给…嫁妆]]></trans> <phonetic><![CDATA[['pɔːʃ(ə)n]]]></phonetic> <tags></tags> <progress>2</progress> </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 dwordsif __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')