python – ElementTree Unicode编码/解码错误

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了python – ElementTree Unicode编码/解码错误，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含4481字，纯文字阅读大概需要7分钟。

内容图文

对于一个项目,我应该增强一些XML并将其存储在一个文件中.我遇到的问题是我不断收到以下错误：

Traceback (most recent call last):
  File "C:\Python27\lib\multiprocessing\process.py", line 258, in _bootstrap
    self.run()
  File "C:\Python27\lib\multiprocessing\process.py", line 114, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\Bart\Dropbox\Studie\2013-2014\BSc-KI\cite_parser\parser.py", line 193, in parse_references
    outputXML = ET.tostring(root, encoding='utf8', method='xml')
  File "C:\Python27\lib\xml\etree\ElementTree.py", line 1126, in tostring
    ElementTree(element).write(file, encoding, method=method)
  File "C:\Python27\lib\xml\etree\ElementTree.py", line 820, in write
    serialize(write, self._root, encoding, qnames, namespaces)
  File "C:\Python27\lib\xml\etree\ElementTree.py", line 939, in _serialize_xml
    _serialize_xml(write, e, encoding, qnames, None)
  File "C:\Python27\lib\xml\etree\ElementTree.py", line 939, in _serialize_xml
    _serialize_xml(write, e, encoding, qnames, None)
  File "C:\Python27\lib\xml\etree\ElementTree.py", line 939, in _serialize_xml
    _serialize_xml(write, e, encoding, qnames, None)
 ECLI:NL:RVS:2012:BY1564
 File "C:\Python27\lib\xml\etree\ElementTree.py", line 937, in _serialize_xml
    write(_escape_cdata(text, encoding))
  File "C:\Python27\lib\xml\etree\ElementTree.py", line 1073, in _escape_cdata
    return text.encode(encoding, "xmlcharrefreplace")
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 80: ordinal not in range(128)

该错误产生于：

outputXML = ET.tostring(root, encoding='utf8', method='xml')

在寻找这个问题的解决方案时,我发现了一些建议,说我应该在函数中添加.decode(‘utf-8’),但这会导致写入函数出现编码错误(首先是解码),所以不会工作…

编码错误：

Traceback (most recent call last):
  File "C:\Python27\lib\multiprocessing\process.py", line 258, in _bootstrap
    self.run()
  File "C:\Python27\lib\multiprocessing\process.py", line 114, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\Bart\Dropbox\Studie\2013-2014\BSc-KI\cite_parser\parser.py", line 197, in parse_references
    myfile.write(outputXML)
UnicodeEncodeError: 'ascii' codec can't encode character u'\xeb' in position 13559: ordinal not in range(128)

它由以下代码生成：

outputXML = ET.tostring(root, encoding='utf8', method='xml').decode('utf-8')

来源(或至少相关部分)：

# URL encodes the parameters
encoded_parameters = urllib.urlencode({'id':ecli})

# Opens XML file
feed = urllib2.urlopen("http://data.rechtspraak.nl/uitspraken/content?"+encoded_parameters, timeout = 3)

# Parses the XML
ecliFile = ET.parse(feed)

# Fetches root element of current tree
root = ecliFile.getroot()

# Write the XML to a file without any extra indents or newlines
outputXML = ET.tostring(root, encoding='utf8', method='xml')

# Write the XML to the file
with open(file, "w") as myfile:
    myfile.write(outputXML)

最后但并非最不重要的是XML示例的URL：http://data.rechtspraak.nl/uitspraken/content?id=ECLI:NL:RVS:2012:BY1542

解决方法:

异常是由字节字符串值引起的.

回溯中的文本应该是一个unicode值,但如果它是一个普通的字节字符串,Python将隐式地首先将它(使用ASCII编解码器)解码为Unicode,这样您就可以再次编码它.

这是解码失败.

因为您实际上没有向我们展示您插入到XML树中的内容,所以除了确保在插入文本时始终使用Unicode值时,很难告诉您要修复的内容.

演示：

>>> root.attrib['oops'] = u'Data with non-ASCII codepoints \u2014 (em dash)'.encode('utf8')
>>> ET.tostring(root, encoding='utf8', method='xml')
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Users/mj/Development/Library/buildout.python/parts/opt/lib/python2.7/xml/etree/ElementTree.py", line 1126, in tostring
    ElementTree(element).write(file, encoding, method=method)
  File "/Users/mj/Development/Library/buildout.python/parts/opt/lib/python2.7/xml/etree/ElementTree.py", line 820, in write
    serialize(write, self._root, encoding, qnames, namespaces)
  File "/Users/mj/Development/Library/buildout.python/parts/opt/lib/python2.7/xml/etree/ElementTree.py", line 932, in _serialize_xml
    v = _escape_attrib(v, encoding)
  File "/Users/mj/Development/Library/buildout.python/parts/opt/lib/python2.7/xml/etree/ElementTree.py", line 1090, in _escape_attrib
    return text.encode(encoding, "xmlcharrefreplace")
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 31: ordinal not in range(128)
>>> root.attrib['oops'] = u'Data with non-ASCII codepoints \u2014 (em dash)'
>>> ET.tostring(root, encoding='utf8', method='xml')
'<?xml version=\'1.0\' encoding=\'utf8\'?> ...'

设置包含ASCII范围之外的字节的bytestring属性会触发异常;使用unicode值确保可以生成结果.

内容总结

以上是互联网集市为您收集整理的python – ElementTree Unicode编码/解码错误全部内容，希望文章能够帮你解决python – ElementTree Unicode编码/解码错误所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。

内容备注

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。

内容手机端