Ascii码编解码器不能解码字节为0xC2蟒蛇NLTK

Question

我有我使用垃圾邮件分类代码和它的作品很好，但每次我尝试干/ lemmatize字我得到这个错误：

文件“ /Users/Ramit/Desktop/Bayes1/src/filter.py “第16行，在trim_word 字= ps.stem（字）

文件” /Library/Python/2.7/site-packages/nltk/stem /porter.py“，行664，在词干 stem = self._step1a（词干）

文件”/Library/Python/2.7/site-packages/nltk/stem/porter.py“，第289行，在_step1a

if word.endswith('ies') and len(word) == 4: 
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 0: ordinal not in range(128) 

这里是我的代码：

from word import Word 
    from nltk.corpus import stopwords 
    from nltk.stem import PorterStemmer 
    ps = PorterStemmer() 
    class Filter(): 

def __init__(self): 
    self.words = dict() 


def trim_word(self, word): 
    # Helper method to trim away some of the non-alphabetic characters 
    # I deliberately do not remove all non-alphabetic characters. 
    word = word.strip(' .:,-!()"?+<>*') 
    word = word.lower() 
      word = ps.stem(word) 
    return word 


def train(self, train_file): 
    lineNumber = 1 
    ham_words = 0 
    spam_words = 0 
      stop = set(stopwords.words('english')) 

    # Loop through all the lines 
    for line in train_file: 
     if lineNumber % 2 != 0: 
      line = line.split('\t') 
      category = line[0] 
      input_words = line[1].strip().split(' ') 

      #Loop through all the words in the line, remove some characters 
      for input_word in input_words: 
       input_word = self.trim_word(input_word) 
       if (input_word != "") and (input_word not in stop): 

        # Check if word is in dicionary, else add 
        if input_word in self.words: 
         word = self.words[input_word] 
        else: 
         word = Word(input_word) 
         self.words[input_word] = word 

        # Check wether the word is in ham or spam sentence, increment counters 
        if category == "ham": 
         word.increment_ham() 
         ham_words += 1 
        elif category == "spam": 
         word.increment_spam() 
         spam_words += 1 

        # Probably bad training file input... 
        else: 
         print "Not valid training file format" 

     lineNumber+=1 

    # Compute the probability for each word in the training set 
    for word in self.words: 
     self.words[word].compute_probability(ham_words, spam_words) 


def get_interesting_words(self, sms): 
    interesting_words = [] 
      stop = set(stopwords.words('english')) 
    # Go through all words in the SMS and append to list. 
    # If we have not seen the word in training, assign probability of 0.4 
    for input_word in sms.split(' '): 
     input_word = self.trim_word(input_word) 
     if (input_word != "") and (input_word not in stop): 
      if input_word in self.words: 
       word = self.words[input_word] 
      else: 
       word = Word(input_word) 
       word.set_probability(0.40) 
      interesting_words.append(word) 

    # Sort the list of interesting words, return top 15 elements if list is longer than 15 
    interesting_words.sort(key=lambda word: word.interesting(), reverse=True) 
    return interesting_words[0:15] 


def filter(self, input_file, result_file): 
    # Loop through all SMSes and compute total spam probability of the sms-message 
    lineNumber = 0 
    for sms in input_file: 
     lineNumber+=1 
     spam_product = 1.0 
     ham_product = 1.0 
     if lineNumber % 2 != 0: 
      try: 
       for word in self.get_interesting_words(sms): 
        spam_product *= word.get_probability() 
        ham_product *= (1.0 - word.get_probability()) 

       sms_spam_probability = spam_product/(spam_product + ham_product) 
      except: 
       result_file.write("error") 

      if sms_spam_probability > 0.8: 
       result_file.write("SPAM: "+sms) 
      else: 
       result_file.write("HAM: "+sms) 
     result_file.write("\n") 

我只是寻找一个解决办法，让我lemmatize /干的话。我试过在网上寻找，我发现了类似的问题，但他们一直没有为我工作。

Answer 1

使用sys。

import sys 
sys.setdefaultencoding('utf-8') 
reload(sys)