class StreamHandler(Handler):
    """
    A handler class which writes logging records, appropriately formatted,
    to a stream. Note that this class does not close the stream, as
    sys.stdout or sys.stderr may be used.

    Fix: Use os dependent newlines when writing output.
    """
    FS = "%s" + os.linesep

    def __init__(self, stream=None):
        """
        Initialize the handler.

        If stream is not specified, sys.stderr is used.
        """
        Handler.__init__(self)
        if stream is None:
            stream = sys.stderr
        self.stream = stream

    def flush(self):
        """
        Flushes the stream.
        """
        if self.stream and hasattr(self.stream, "flush"):
            self.stream.flush()

    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 determine how to do the
        output to the stream.
        """
        try:
            msg = self.format(record)
            stream = self.stream
            if not _unicode: #if no unicode support...
                stream.write(self.FS % msg)
            else:
                try:
                    if (isinstance(msg, unicode) and
                        getattr(stream, 'encoding', None)):
                        ufs = self.FS.decode(stream.encoding)
                        try:
                            stream.write(ufs % msg)
                        except UnicodeEncodeError:
                            #Printing to terminals sometimes fails. For example,
                            #with an encoding of 'cp1251', the above write will
                            #work if written to a stream opened or wrapped by
                            #the codecs module, but fail when writing to a
                            #terminal even when the codepage is set to cp1251.
                            #An extra encoding step seems to be needed.
                            stream.write((ufs % msg).encode(stream.encoding))
                    else:
                        stream.write(self.FS % msg)
                except UnicodeError:
                    stream.write(self.FS % msg.encode("UTF-8"))
            self.flush()
        except (KeyboardInterrupt, SystemExit):
            raise
        except:
            self.handleError(record)