如何处理这个异常'ascii'编解码器无法解码？

Question

我得到'ascii' codec can't decode byte 0xe2 in position 620: ordinal not in range(128) 再次在我的 appengine 的日志文件中，我不知道该怎么做。有问题的代码似乎是'name': form.name.data.decode('utf-8')，我已经尝试了一切让它工作、编码、解码和 unicode()，但不知道为什么它不是内置的。我通常在这里得到答案，我必须知道输入是什么，但为什么？当我尝试使用一些像 åäö 这样的外国字符时，它确实有效，所以问题出在哪里并不明显。完整的堆栈跟踪是

'ascii' codec can't decode byte 0xe2 in position 620: ordinal not in range(128)
Traceback (most recent call last):
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1511, in __call__
    rv = self.handle_exception(request, response, e)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1505, in __call__
    rv = self.router.dispatch(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1253, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1077, in __call__
    return handler.dispatch()
  File "/base/data/home/apps/s~montaoproject/2015p.373396352072543150/authhandlers.py", line 34, in dispatch
    webapp2.RequestHandler.dispatch(self)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 547, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 545, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~montaoproject/2015p.373396352072543150/main.py", line 2610, in post
    'name': form.name.data.decode('utf-8')
  File "/base/data/home/apps/s~montaoproject/2015p.373396352072543150/authhandlers.py", line 104, in render
    self.response.write(self.jinja2.render_template(template_name, **values))
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2_extras/jinja2.py", line 158, in render_template
    return self.environment.get_template(_filename).render(**context)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/jinja2-2.6/jinja2/environment.py", line 894, in render
    return self.environment.handle_exception(exc_info, True)
  File "templates/2.html", line 1680, in top-level template code
    <div class="table_data"> {{form.text(cols="45", rows="10", placeholder=_('Please describe the product or service in a few simple sentences'))|safe}}{% if form.text.errors %} <div class="maintext">
  File "/base/data/home/apps/s~montaoproject/2015p.373396352072543150/wtforms/fields/core.py", line 139, in __call__
    return self.widget(self, **kwargs)
  File "/base/data/home/apps/s~montaoproject/2015p.373396352072543150/main.py", line 2034, in __call__
    return super(MyTextArea, self).__call__(field, **kwargs)
  File "/base/data/home/apps/s~montaoproject/2015p.373396352072543150/wtforms/widgets/core.py", line 221, in __call__
    return HTMLString('<textarea %s>%s</textarea>' % (html_params(name=field.name, **kwargs), escape(text_type(field._value()))))
  File "/base/data/home/apps/s~montaoproject/2015p.373396352072543150/wtforms/fields/core.py", line 496, in _value
    return text_type(self.data) if self.data is not None else ''
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 620: ordinal not in range(128)

更新 140209 06:02 CET

我也使用decode 得到错误

'ascii' codec can't decode byte 0xd7 in position 0: ordinal not in range(128)
Traceback (most recent call last):
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1511, in __call__
    rv = self.handle_exception(request, response, e)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1505, in __call__
    rv = self.router.dispatch(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1253, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1077, in __call__
    return handler.dispatch()
  File "/base/data/home/apps/s~montaoproject/2015r.373623653798528527/authhandlers.py", line 34, in dispatch
    webapp2.RequestHandler.dispatch(self)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 547, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 545, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~montaoproject/2015r.373623653798528527/main.py", line 2664, in post
    'name': form.name.data.encode('utf-8')
  File "/base/data/home/apps/s~montaoproject/2015r.373623653798528527/authhandlers.py", line 104, in render
    self.response.write(self.jinja2.render_template(template_name, **values))
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2_extras/jinja2.py", line 158, in render_template
    return self.environment.get_template(_filename).render(**context)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/jinja2-2.6/jinja2/environment.py", line 894, in render
    return self.environment.handle_exception(exc_info, True)
  File "templates/2.html", line 223, in top-level template code
    {{ form.phonenumber(size="17", maxlength="14")|safe }}<label for="phone_hidden">{{ form.phoneview|safe }}{% trans %}View on site{% endtrans %}</label><br />{% trans %}Use areacode{% endtrans %}<br>
  File "/base/data/home/apps/s~montaoproject/2015r.373623653798528527/wtforms/fields/core.py", line 139, in __call__
    return self.widget(self, **kwargs)
  File "/base/data/home/apps/s~montaoproject/2015r.373623653798528527/wtforms/widgets/core.py", line 123, in __call__
    kwargs['value'] = field._value()
  File "/base/data/home/apps/s~montaoproject/2015r.373623653798528527/wtforms/fields/core.py", line 496, in _value
    return text_type(self.data) if self.data is not None else ''
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd7 in position 0: ordinal not in range(128)

Answer 1

您应该使用encode 而不是decode。 name.data 中的内容是一个 unicode 字符串（您可以从错误消息中的字节 0xe2 中理解这一点），您需要将其转换为字节字符串。

我做了一些 ipython 摆弄：

In [32]: unichr(0xe2)
Out[32]: u'\xe2'

In [33]: unichr(0xe2).encode("utf-8")
Out[33]: '\xc3\xa2'

In [34]: print unichr(0xe2).encode("utf-8")
â