#!/usr/bin/python
#-*-coding:utf-8-*-
__author__ = 'lxw'
import string
defloadenglish
():#這個函式載入字典檔案
dicfile = open('dictionary.txt')
english_word= {}
for word in dicfile.read().split('\n'):
english_word[word]=none
return english_word
english_words = loadenglish()
defremovenonletters
(message):
#移除非字母字元，包括標點符號和數字
letteronly =
allletter = string.uppercase+string.lowercase+' \n\t'
for i in message:
if i in allletter:
return
"".join(letteronly)
defgetenglishcount
(message):
#得到一段字串中單詞的個數
message = message.upper()
message = removenonletters(message)
match = 0
words = message.split()
if len(words)==0: return
0.0for word in words:
if word in english_words.keys():
match+=1
return float(match)/len(words)
defisenglish
(message,wordpercentage=20,letterpercentage=85):
#呼叫這個函式判斷一段字串是否問一段英文.如果是則返回true
wordmatch = getenglishcount(message)*100 >= wordpercentage
removedmsg = removenonletters(message)
lettermatch = (len(removedmsg)/float(len(message)))*100>=letterpercentage
return wordmatch and lettermatch
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