def __init__(self, subject='',
                 recipients=None,
                 body=None,
                 html=None,
                 alts=None,
                 sender=None,
                 cc=None,
                 bcc=None,
                 attachments=None,
                 reply_to=None,
                 date=None,
                 charset=None,
                 extra_headers=None,
                 mail_options=None,
                 rcpt_options=None):

        sender = sender or current_app.extensions['mail'].default_sender

        if isinstance(sender, tuple):
            sender = sender % "%s <%s>"

        self.recipients = recipients or []
        self.subject = subject
        self.sender = sender
        self.reply_to = reply_to
        self.cc = cc or []
        self.bcc = bcc or []
        self.body = body
        self.alts = dict(alts or {})
        self.html = html
        self.date = date
        self.msgId = make_msgid()
        self.charset = charset
        self.extra_headers = extra_headers
        self.mail_options = mail_options or []
        self.rcpt_options = rcpt_options or []
        self.attachments = attachments or []
dataset/ETHPy150Open mattupstate/flask-mail/flask_mail.py/Message.__init__/swapped operands of `%`