Python Flask邮件 KeyError KeyError：'mail'。

Question

我有一个使用Python Flask和Flask-Mail库时遇到的问题。

我得到了一个错误：

KeyError: 'mail'

有人能帮助我解决这个问题吗？

我的代码是：

# -*- coding: utf-8 -*-
from flask import Flask
from flask.ext.mail import Message
from flask.ext.mail import Mail
from ws import app


class Email():  

def __init__(self):
    ""
#
# Enviar el email
#
def enviar_mail(self,subject, sender, recipients, text_body="hola mundo txt", html_body="hola mundo html"):
    app = Flask(__name__)

    app.config.update(dict(
        MAIL_SERVER = 'smtp.gmail.com',
        MAIL_PORT = 465,
        MAIL_USE_TLS = False,
        MAIL_USE_SSL = True,
        MAIL_USERNAME = '[e-mail]',
        MAIL_PASSWORD = 'mypasswd$%'
    ))

    mail = Mail(app)
    mail.init_app(app)
    msg = Message("Hello", sender="[e-mail]",recipients=["[e-mail]"])
    msg.body = "testing"
    msg.html = "<b>testing</b>"
    mail.send(msg)

错误提示：

KeyError
KeyError: 'mail'
Traceback (most recent call last)
File "/home/javier/python/wszbeltia/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__

mail.send(msg)
File "/home/javier/python/wszbeltia/lib/python2.7/site-packages/flask_mail.py", line 492, in send

message.send(connection)
File "/home/javier/python/wszbeltia/lib/python2.7/site-packages/flask_mail.py", line 427, in send

connection.send(self)
File "/home/javier/python/wszbeltia/lib/python2.7/site-packages/flask_mail.py", line 190, in send

message.as_bytes() if PY3 else message.as_string(),
File "/home/javier/python/wszbeltia/lib/python2.7/site-packages/flask_mail.py", line 381, in as_string

return self._message().as_string()
File "/home/javier/python/wszbeltia/lib/python2.7/site-packages/flask_mail.py", line 307, in _message

**ascii_attachments = current_app.extensions['mail'].ascii_attachments
KeyError: 'mail'**

- daronwolff

Answer 1

降级到 flask_mail==0.9.0

看起来这是版本0.9.1中的一个退化。

- Juan Megino

---

是的，你是正确的。 我解决了这个问题： pip uninstall flask-mail pip install flask_mail==0.9.0 - daronwolff

如果这个答案是您想要的，请务必接受它，以便其他用户知道问题已得到满意答复。 - Sylvester Kruin

Answer 2

我无法在Python 3.8中使用flask_mail==0.9.0，它会给我报错："smtplib.server.sendmail函数在Python中引发UnicodeEncodeError：'ascii' codec无法编码字符"。

我需要使用flask_mail==0.9.1。但是使用flask_mail==0.9.1时，我遇到了"Email KeyError KeyError: 'mail'"错误。

我通过使用"current_app"而不是"app"解决了"Email KeyError KeyError: 'mail'"错误。

from flask import current_app
mail = Mail(current_app)
# send unicode not ascii or latin 
msg.html = message.encode("utf-8")

- C Halsema