Method make_mixed

Lib/email/message.py:1180–1181

(self, boundary=None)

        self._make_multipart('alternative', ('mixed',), boundary)

    def make_mixed(self, boundary=None):
        self._make_multipart('mixed', (), boundary)

    def _add_multipart(self, _subtype, *args, _disp=None, **kw):
        if (self.get_content_maintype() != 'multipart' or