flask邮件错误:标题= [self.sender，self.reply_to] + self.recipients

Question

我应该解释为什么我的问题不是: TypeError:只能将list (不是“str”)连接到list

...so它不是重复的，因为post处理的是出现在代码中的连接运算符+；而我的问题在错误消息中有该运算符，但在代码中没有。

这是相关的Flask代码，我查看了回溯(如下所示)……它看起来像是

mail.sent(msg)

line是进攻发生的地方。我真的很努力地尝试解决这个问题，显然msg的内容有问题……但我不知道是什么。任何帮助都将不胜感激！

            token = s.dumps(form.email.data, salt='email-confirm')
            subject = 'subject goes here'
            msg = Message(subject=subject, sender='recipient@email.com',
                          recipients=form.email.data)
            link = url_for('confirm_email', token=token, _external=True)
            pull_row = User.query.filter_by(email=form.email.data).first()
            firstname = pull_row.firstname
            msg.html = render_template("email_confirmationemail.html", link=link, name=firstname)
            mail.send(msg)
            return redirect(url_for('checkyouremail'))

这是回溯

2017-08-07T06:00:05.982678+00:00 app[web.1]: Traceback (most recent call last):
2017-08-07T06:00:05.982679+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/sync.py", line 130, in handle
2017-08-07T06:00:05.982680+00:00 app[web.1]:     self.handle_request(listener, req, client, addr)
2017-08-07T06:00:05.982681+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/sync.py", line 171, in handle_request
2017-08-07T06:00:05.982681+00:00 app[web.1]:     respiter = self.wsgi(environ, resp.start_response)
2017-08-07T06:00:05.982682+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1836, in __call__
2017-08-07T06:00:05.982682+00:00 app[web.1]:     return self.wsgi_app(environ, start_response)
2017-08-07T06:00:05.982683+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1820, in wsgi_app
2017-08-07T06:00:05.982684+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1403, in handle_exception
2017-08-07T06:00:05.982684+00:00 app[web.1]:     response = self.make_response(self.handle_exception(e))
2017-08-07T06:00:05.982685+00:00 app[web.1]:     reraise(exc_type, exc_value, tb)
2017-08-07T06:00:05.982686+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
2017-08-07T06:00:05.982686+00:00 app[web.1]:     raise value
2017-08-07T06:00:05.982687+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1817, in wsgi_app
2017-08-07T06:00:05.982688+00:00 app[web.1]:     response = self.full_dispatch_request()
2017-08-07T06:00:05.982689+00:00 app[web.1]:     rv = self.handle_user_exception(e)
2017-08-07T06:00:05.982688+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1477, in full_dispatch_request
2017-08-07T06:00:05.982690+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1381, in handle_user_exception
2017-08-07T06:00:05.982691+00:00 app[web.1]:     reraise(exc_type, exc_value, tb)
2017-08-07T06:00:05.982691+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
2017-08-07T06:00:05.982692+00:00 app[web.1]:     raise value
2017-08-07T06:00:05.982692+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1475, in full_dispatch_request
2017-08-07T06:00:05.982693+00:00 app[web.1]:     rv = self.dispatch_request()
2017-08-07T06:00:05.982694+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1461, in dispatch_request
2017-08-07T06:00:05.982695+00:00 app[web.1]:   File "/app/app.py", line 213, in login
2017-08-07T06:00:05.982695+00:00 app[web.1]:     return self.view_functions[rule.endpoint](**req.view_args)
2017-08-07T06:00:05.982696+00:00 app[web.1]:     mail.send(msg)
2017-08-07T06:00:05.982697+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask_mail.py", line 492, in send
2017-08-07T06:00:05.982697+00:00 app[web.1]:     message.send(connection)
2017-08-07T06:00:05.982698+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask_mail.py", line 427, in send
2017-08-07T06:00:05.982698+00:00 app[web.1]:     connection.send(self)
2017-08-07T06:00:05.982699+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask_mail.py", line 181, in send
2017-08-07T06:00:05.982700+00:00 app[web.1]:     if message.has_bad_headers():
2017-08-07T06:00:05.982700+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask_mail.py", line 400, in has_bad_headers
2017-08-07T06:00:05.982701+00:00 app[web.1]:     headers = [self.sender, self.reply_to] + self.recipients
2017-08-07T06:00:05.982704+00:00 app[web.1]: TypeError: can only concatenate list (not "str") to list

Answer 1

所以这就是解决我遇到的问题的方法。(这是关于消息中的recipients参数)。我只有一个收件人。但我想可能会有很多获奖者。在任何情况下，将我的一个收件人从字符串更改为列表都起到了作用。例如，从

recipients=email

至

recipients=email.split()

修复了问题。我是第一次使用flask-mail，在使用字符串作为收件人时，我毫不犹豫。

Answer 2

我今天遇到了同样的问题，这里是我如何解决它的。

recipient = request.form.get("email")
Message(subject=subject, recipients=[recipient]

收件人应该作为列表传递，即使您有一个列表。

参数：

• recipients -

电子邮件地址列表

API