本文實例為大家分享了python實現按首字母分類查找的具體代碼，供大家參考，具體內容如下
要求：
1.自己查找一些英文詞匯，存儲到某個容器類中
2.根據英文詞匯的首字母進行分類，類似于手機通訊簿中的快速查找功能
3.根據用戶輸入的字母，找到該字母開頭的所有單詞
#coding=utf-8
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"]
while True:
startLetter=raw_input("輸入一個字母，列出所有以此字母開頭的單詞:")
if len(startLetter)!=1:
print "必須是一個字母"
else:
reLexicons=[] #結果列表
for x in xrange(len(lexicons)):
lexicon=lexicons[x]
if lexicon[0].lower()==startLetter.lower():#都轉為小寫后比較 開頭字母不區分大小寫
reLexicons.append(lexicon)
if len(reLexicons)==0:
print "沒有結果"
else:
for x in xrange(len(reLexicons)):
print reLexicons[x]
上面的代碼沒有走第二步，如下代碼 使用字典解決第二步
#coding=utf-8
'''
邊遍歷，邊構造 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={}
#分類 保存字典中
lexiconLen=len(lexicons)
for x in xrange(len(lexicons)):
lexicon=lexicons[x]
startLetter=lexicon[0]
dictLexicons=lexiconDict.get(startLetter,[])
#空列表說明沒有Key 則添加Key 否則追加Key對應的Value
if len(dictLexicons)==0:
lexiconDict[startLetter]=[lexicons[x]]
else:
dictLexicons.append(lexicons[x])
while True:
startLetter=raw_input("輸入一個字母，列出所有以此字母開頭的單詞:")
if len(startLetter)!=1:
print "必須是一個字母"
else:
lexicons=lexiconDict.get(startLetter.lower(),[])
if len(lexicons)==0:
print "沒有結果"
else:
for x in lexicons:
print x
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