UnicodeEncodeError：'ascii'编解码器无法在位置0编码字符u'\ xef'：序数不在范围内（128）

Question

我想解析我的XML文档。所以我将我的XML文档存储如下

class XMLdocs(db.Expando):  
   id = db.IntegerProperty()    
   name=db.StringProperty()  
   content=db.BlobProperty()

现在我的下面是我的代码

parser = make_parser()     
curHandler = BasketBallHandler()  
parser.setContentHandler(curHandler)  
for q in XMLdocs.all():  
        parser.parse(StringIO.StringIO(q.content))

我低于错误

'ascii' codec can't encode character u'\xef' in position 0: ordinal not in range(128)
Traceback (most recent call last):  
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 517, in __call__
    handler.post(*groups)   
  File "/base/data/home/apps/parsepython/1.348669006354245654/mapreduce/base_handler.py", line 59, in post
    self.handle()   
  File "/base/data/home/apps/parsepython/1.348669006354245654/mapreduce/handlers.py", line 168, in handle
    scan_aborted = not self.process_entity(entity, ctx)   
  File "/base/data/home/apps/parsepython/1.348669006354245654/mapreduce/handlers.py", line 233, in process_entity
    handler(entity)   
  File "/base/data/home/apps/parsepython/1.348669006354245654/parseXML.py", line 71, in process
    parser.parse(StringIO.StringIO(q.content))   
  File "/base/python_runtime/python_dist/lib/python2.5/xml/sax/expatreader.py", line 107, in parse
    xmlreader.IncrementalParser.parse(self, source)   
  File "/base/python_runtime/python_dist/lib/python2.5/xml/sax/xmlreader.py", line 123, in parse
    self.feed(buffer)  
  File "/base/python_runtime/python_dist/lib/python2.5/xml/sax/expatreader.py", line 207, in feed
    self._parser.Parse(data, isFinal)   
  File "/base/data/home/apps/parsepython/1.348669006354245654/parseXML.py", line 136, in characters   
    print ch   
UnicodeEncodeError: 'ascii' codec can't encode character u'\xef' in position 0: ordinal not in range(128)

Answer 1

看来您要达到UTF-8字节顺序标记（BOM）。尝试使用此Unicode字符串并提取出BOM：

import codecs

content = unicode(q.content.strip(codecs.BOM_UTF8), 'utf-8')
parser.parse(StringIO.StringIO(content))

我使用strip而不是lstrip因为在您的情况下您可能多次出现BOM表，这可能是由于串联的文件内容引起的。