python实现按首字母分类查找功能

Python  /  管理员 发布于 7年前   202

本文实例为大家分享了python实现按首字母分类查找的具体代码，供大家参考，具体内容如下

要求：

1.自己查找一些英文词汇，存储到某个容器类中
2.根据英文词汇的首字母进行分类，类似于手机通讯簿中的快速查找功能
3.根据用户输入的字母，找到该字母开头的所有单词

#coding=utf-8lexicons=["the","be","of","and","A","to","in","he","have","it","that","for","they","I","with","as","not","on","she","at","by","this","we","you","do","but","from","or","which","one","would","all","will","there","say","who","make","when","can"]while True: startLetter=raw_input("输入一个字母，列出所有以此字母开头的单词:") if len(startLetter)!=1: print "必须是一个字母" else: reLexicons=[] #结果列表 for x in xrange(len(lexicons)):  lexicon=lexicons[x]  if lexicon[0].lower()==startLetter.lower():#都转为小写后比较 开头字母不区分大小写  reLexicons.append(lexicon) if len(reLexicons)==0:  print "没有结果" else:  for x in xrange(len(reLexicons)):  print reLexicons[x]

上面的代码没有走第二步，如下代码 使用字典解决第二步

#coding=utf-8'''边遍历，边构造 key value '''lexicons=["the","be","of","and","A","to","in","he","have","it","that","for","they","I","with","as","not","on","she","at","by","this","we","you","do","but","from","or","which","one","would","all","will","there","say","who","make","when","can"]lexiconDict={}#分类 保存字典中lexiconLen=len(lexicons)for x in xrange(len(lexicons)): lexicon=lexicons[x] startLetter=lexicon[0] dictLexicons=lexiconDict.get(startLetter,[])  #空列表说明没有Key 则添加Key 否则追加Key对应的Value if len(dictLexicons)==0: lexiconDict[startLetter]=[lexicons[x]] else: dictLexicons.append(lexicons[x])while True: startLetter=raw_input("输入一个字母，列出所有以此字母开头的单词:") if len(startLetter)!=1: print "必须是一个字母" else: lexicons=lexiconDict.get(startLetter.lower(),[]) if len(lexicons)==0:  print "没有结果" else:  for x in lexicons:  print x

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