UnicodeDecodeError：'ascii'编解码器无法解码位置0的字节0xe0：序号不在范围（128）

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问题描述

在我的一台机器上，当我使用谷歌应用程序引擎或django时，我有错误。

On one of my machines I have the error when I am working with google apps engine or django.

例如：

app.yaml

app.yaml

application: demas1252c
version: 1
runtime: python
api_version: 1


handlers:
   - url: /images
static_dir: images
   - url: /css
static_dir: css
   - url: /js
static_dir: js
   - url: /.*
script: demas1252c.py

demas1252c.py

import cgi
import wsgiref.handlers


from google.appengine.ext.webapp import template
from google.appengine.ext import webapp


class MainPage(webapp.RequestHandler):
def get(self):
values = {'id' : 10}


self.response.out.write(template.render('foto.html', values))


application = webapp.WSGIApplication([('/', MainPage)], debug = True)
wsgiref.handlers.CGIHandler().run(application)

foto.html

<!DOCTYPE html>
<html lang="en">
    <head></head>
<body>some</body>
</html>

错误信息：

C:\artefacts\dev\project>"c:\Program Files\Google\google_appengine\dev_appserver.py" foto-hosting
Traceback (most recent call last):
  File "c:\Program Files\Google\google_appengine\dev_appserver.py", line 69, in <module>
    run_file(__file__, globals())
  File "c:\Program Files\Google\google_appengine\dev_appserver.py", line 65, in run_file
    execfile(script_path, globals_)
  File "c:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_main.py", line 92, in <module>
    from google.appengine.tools import dev_appserver
  File "c:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 140, in <module>
    mimetypes.add_type(mime_type, '.' + ext)
  File "C:\Python27\lib\mimetypes.py", line 344, in add_type
    init()
  File "C:\Python27\lib\mimetypes.py", line 355, in init
    db.read_windows_registry()
  File "C:\Python27\lib\mimetypes.py", line 260, in read_windows_registry
    for ctype in enum_types(mimedb):
  File "C:\Python27\lib\mimetypes.py", line 250, in enum_types
    ctype = ctype.encode(default_encoding) # omit in 3.x!
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe0 in position 0: ordinal not in range(128)

当我使用django中的静态文件（没有gae）时，我有非常类似的错误（使用不同的堆栈）。

When I am working with static files in django (without gae) I have very similar error (with different stack).

我试图找到错误原因和添加代码到mimetypes.py：

I tried to find the reason of error and added code to mimetypes.py:

print '====='
print ctype
ctype = ctype.encode(default_encoding) # omit in 3.x!

然后我在控制台中收到下一条消息：

Then I get next messages in my console:

=====
video/x-ms-wvx
=====
video/x-msvideo
=====
рєфшю/AMR
Traceback (most recent call last):

在注册表HKCR / Mime / Database / ContentType /我有五个键与俄语（西里尔）字母。但是如何解决这个错误？

In the registry HKCR/Mime/Database/ContentType/ I have five keys with russian (cyrilic) letters. But how can I fix this error?

推荐答案

这是 mimetypes ，由注册表中的不良数据触发。（рєфшю/ AMR 根本不是有效的MIME媒体类型。）

This is a bug in mimetypes, triggered by bad data in the registry. (рєфшю/AMR is not at all a valid MIME media type.)

ctype 是由 _winreg.EnumKey 返回的注册表项名称，其中 mimetypes 正在期待一个Unicode字符串，但它不是。不同于 _winreg.QueryValueEx ， EnumKey 返回一个字节字符串（直接来自ANSI版本的Windows API; _winreg 在Python 2中不使用Unicode接口，即使它返回Unicode字符串，所以它永远不会正确读取非ANSI字符。）

ctype is a registry key name returned by _winreg.EnumKey, which mimetypes is expecting to be a Unicode string, but it isn't. Unlike _winreg.QueryValueEx, EnumKey returns a byte string (direct from the ANSI version of the Windows API; _winreg in Python 2 doesn't use the Unicode interfaces even though it returns Unicode strings, so it'll never read non-ANSI characters correctly).

因此，尝试在编码之前尝试获取Unicode字符串时尝试 .encode 失败，Unicode 解码返回ASCII！

So the attempt to .encode it fails with a UnicodeDecodeError trying to get a Unicode string before encoding it back to ASCII!

try:
    ctype = ctype.encode(default_encoding) # omit in 3.x!
except UnicodeEncodeError:
    pass

mimetypes 应该被删除。

ETA：。

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