使用AppEngin发送邮件时发生UnicodeDecodeError

Question

我使用的是appengine的mail.EmailMessage，其中我的subjectparam是一个包含非ASCII字符的Unicode对象（åäö）。我得到以下错误：

Traceback (most recent call last):
  File  "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 765, in emit
    self.stream.write(fs % msg.encode("UTF-8"))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 101: ordinal not in range(128)

我甚至尝试过在发送UTF-8之前自己进行编码，但是我得到了同样的错误。在

更新了更多代码：

使用以下处理程序使用任务队列发送电子邮件：

^{pr2}$

以下是日志的输出：

INFO     2011-02-21 12:34:53,308 dev_appserver.py:3317] "POST /tasks/mail HTTP/1.1" 200 -
INFO     2011-02-21 12:34:53,329 view.py:696] <type 'unicode'>
INFO     2011-02-21 12:34:53,330 view.py:697] ProffsKnuten.se - Nytt jobb: Bluttan blä
INFO     2011-02-21 12:34:53,330 mail_stub.py:88] MailService.Send
INFO     2011-02-21 12:34:53,330 mail_stub.py:89]   From: ProffsKnuten support <kontakt@proffsknuten.se>
INFO     2011-02-21 12:34:53,330 mail_stub.py:92]   To: [censored]@gmail.com
Traceback (most recent call last):
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 765, in emit
    self.stream.write(fs % msg.encode("UTF-8"))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 101: ordinal not in range(128)
INFO     2011-02-21 12:34:53,333 mail_stub.py:104]   Body:
INFO     2011-02-21 12:34:53,343 mail_stub.py:105]     Content-type: text/plain
INFO     2011-02-21 12:34:53,343 mail_stub.py:106]     Data length: 371
INFO     2011-02-21 12:34:53,343 mail_stub.py:211] You are not currently sending out real email.  If you have sendmail installed you can use it by using the server with --enable_sendmail
INFO     2011-02-21 12:34:53,344 view.py:700] Sent e-mail to [censored]@gmail.com with subject "ProffsKnuten.se - Nytt jobb: Bluttan blä".

更新2：

添加了emit函数的源代码：

def emit(self, record):
    """  
    Emit a record.

    If a formatter is specified, it is used to format the record.
    The record is then written to the stream with a trailing newline.  If
    exception information is present, it is formatted using
    traceback.print_exception and appended to the stream.  If the stream
    has an 'encoding' attribute, it is used to encode the message before
    output to the stream.
    """
    try: 
        msg = self.format(record)
        fs = "%s\n"
        if not hasattr(types, "UnicodeType"): #if no unicode support...
            self.stream.write(fs % msg) 
        else:
            try: 
                if getattr(self.stream, 'encoding', None) is not None:
                    self.stream.write(fs % msg.encode(self.stream.encoding))
                else:
                    self.stream.write(fs % msg) 
            except UnicodeError:
                self.stream.write(fs % msg.encode("UTF-8"))
        self.flush()
    except (keyboardInterrupt, SystemExit):
        raise
    except:
        self.handleError(record)

Answer 1

我用的是python2.6而不是2.5运行appengine。在2.5中，它按预期工作。在