TypeError：'in '需要字符串作为左操作数，而不是QString

Question

我正在尝试编写一个简单的应用程序来发送（并可能接收）来自我的Gmail帐户的电子邮件。我设法在我的源代码中硬编码我的帐户信息时这样做，但现在我想在GUI字段中输入它们并从那里读取信息。这是代码：

import sys
import smtplib
from PyQt4 import QtCore, QtGui
from Notifier_Main import Ui_Notifier_Main_GUI

class MainGUI(QtGui.QWidget, Ui_Notifier_Main_GUI):
    def __init__(self):
        QtGui.QWidget.__init__(self)
        self.setupUi(self)
        self.sendButton.clicked.connect(self.send)

    def send(self):
        fromaddr = self.senderEmailLineEdit.text()
        toaddrs  = self.receiverEmailLineEdit.text()
        msg = self.msgTextEdit.toPlainText()
        username = self.senderEmailLineEdit.text()
        server = smtplib.SMTP("smtp.gmail.com:587")
        server.starttls()
        server.login(username, 'password')
        server.sendmail(fromaddr, toaddrs, msg)
        server.quit()

if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    main_gui = MainGUI()
    main_gui.show()
sys.exit(app.exec_())

当我运行它时，我得到这个长屁股错误：

 C:\Python27\python.exe "E:/Python Projekti/Notifier/src/main.py"
Traceback (most recent call last):
  File "E:/Python Projekti/Notifier/src/main.py", line 20, in send
    server.sendmail(fromaddr, toaddrs, msg)
  File "C:\Python27\lib\smtplib.py", line 728, in sendmail
    (code, resp) = self.mail(from_addr, esmtp_opts)
  File "C:\Python27\lib\smtplib.py", line 480, in mail
    self.putcmd("mail", "FROM:%s%s" % (quoteaddr(sender), optionlist))
  File "C:\Python27\lib\smtplib.py", line 141, in quoteaddr
    m = email.utils.parseaddr(addr)[1]
  File "C:\Python27\lib\email\utils.py", line 214, in parseaddr
    addrs = _AddressList(addr).addresslist
  File "C:\Python27\lib\email\_parseaddr.py", line 457, in __init__
    self.addresslist = self.getaddrlist()
  File "C:\Python27\lib\email\_parseaddr.py", line 218, in getaddrlist
    ad = self.getaddress()
  File "C:\Python27\lib\email\_parseaddr.py", line 228, in getaddress
    self.gotonext()
  File "C:\Python27\lib\email\_parseaddr.py", line 204, in gotonext
    if self.field[self.pos] in self.LWS + '\n\r':
TypeError: 'in <string>' requires string as left operand, not QString

我尝试使用谷歌搜索该类型错误，并找到一些关于spyderlib的链接，但由于我对这一切都很新，我无法弄清楚该怎么做。

Answer 1

对具有文本的Qt元素的大多数请求将返回QStrings，Qt使用的简单字符串容器。大多数其他库都会期望常规的python字符串，因此使用str（）进行强制转换可能是必要的。所有的：

fromaddr = self.senderEmailLineEdit.text()
toaddrs  = self.receiverEmailLineEdit.text()
msg = self.msgTextEdit.toPlainText()
username = self.senderEmailLineEdit.text()

是QString对象。

Answer 2

尝试使用内置函数str（）将变量转换为字符串

Answer 3

只是用这个：

fromaddr = str(self.senderEmailLineEdit.text())
toaddrs  = str(self.receiverEmailLineEdit.text())
msg = str(self.msgTextEdit.toPlainText())
username = str(self.senderEmailLineEdit.text())