Fixed #13694 -- Made SafeMIMEText's constructor compatible with MIMEText.

class SafeMIMEText(MIMEMixin, MIMEText):

    def __init__(self, text, subtype, charset):

        self.encoding = charset

        if charset == 'utf-8':

    def __init__(self, _text, _subtype='plain', _charset=None):

        self.encoding = _charset

        if _charset == 'utf-8':

            # Unfortunately, Python < 3.5 doesn't support setting a Charset instance

            # as MIMEText init parameter (http://bugs.python.org/issue16324).

            # We do it manually and trigger re-encoding of the payload.

            MIMEText.__init__(self, text, subtype, None)

            MIMEText.__init__(self, _text, _subtype, None)

            del self['Content-Transfer-Encoding']

            # Workaround for versions without http://bugs.python.org/issue19063

            if (3, 2) < sys.version_info < (3, 3, 4):

                payload = text.encode(utf8_charset.output_charset)

                payload = _text.encode(utf8_charset.output_charset)

                self._payload = payload.decode('ascii', 'surrogateescape')

                self.set_charset(utf8_charset)

            else:

                self.set_payload(text, utf8_charset)

            self.replace_header('Content-Type', 'text/%s; charset="%s"' % (subtype, charset))

                self.set_payload(_text, utf8_charset)

            self.replace_header('Content-Type', 'text/%s; charset="%s"' % (_subtype, _charset))

        elif _charset is None:

            # the default value of '_charset' is 'us-ascii' on Python 2

            MIMEText.__init__(self, _text, _subtype)

        else:

            MIMEText.__init__(self, text, subtype, charset)

            MIMEText.__init__(self, _text, _subtype, _charset)

    def __setitem__(self, name, val):

        name, val = forbid_multi_line_headers(name, val, self.encoding)