我正在尝试制作一个每1分钟更新一次gui的绘制事件。。以下是main.py的代码：

# -*- coding: utf-8 -*-

from PyQt4 import QtGui, QtCore
import sys
import main3, report
import MySQLdb

db = MySQLdb.connect(host="localhost",    # your host, usually localhost
                     user="root",         # your username
                     passwd="**************",  # your password
                     db="health",
                     port=3306)        # name of the data base

cur = db.cursor()

class report(QtGui.QMainWindow, report.Ui_Report1):
    def __init__(self, p_id, parent=None):
        super(report, self).__init__(parent)
        self.setupUi(self)

        self.lineEdit.setText('ID: ' + str(p_id))
        cur.execute("SELECT * FROM patient WHERE id = '%s'"%(p_id))
        pt_row_report = cur.fetchall()
        for row in pt_row_report:
            pt_name_report = row[1]
            pt_age_report = row[2]
            cur.execute("SELECT * FROM clinic WHERE p_id = '%s'"%(p_id))
            clinic_row = cur.fetchone()
            d_id = clinic_row[2]
            ray_type1 = clinic_row[6]
            ray_type = ray_type1[17:]
            cur.execute("SELECT * FROM staff WHERE id = '%s'"%(d_id))
            staff_row = cur.fetchall()[0]
            doctor_name = staff_row[1]
            doctor_id = staff_row[0]
            self.lineEdit_2.setText('Name: ' + str(pt_name_report))
            self.lineEdit_3.setText('Age: ' + str(pt_age_report))
            self.lineEdit_6.setText(str(ray_type))
            self.lineEdit_7.setText('Dr. ' + str(doctor_name))

            cur.execute("SELECT Name FROM staff WHERE id = 48588")
            ray_dr_name = cur.fetchone()[0]
            self.lineEdit_4.setText('Dr. ' + str(ray_dr_name))
            self.pushButton.clicked.connect(lambda: self.update_report(p_id, ray_type,doctor_id))

    def update_report(self, name, ray, d_id):
        x = self.textEdit.toPlainText()
        sql = "UPDATE clinic SET Extra_Notice = (%s) WHERE p_id=(%s)"
        cur.execute(sql,(x,name))
        db.commit()
        cur.execute("INSERT INTO rays (p_ID, Ray_Type, Report, D_ID, RS_ID) VALUES (%s,%s,%s,%s,%s)", (int(name), ray, x, d_id, 48588))
        db.commit()

    def get_text(self, x):
        x = self.textEdit.text()
        return x

class First(QtGui.QMainWindow, main3.Ui_MainWindow):
    def __init__(self, parent=None):
        super(First, self).__init__(parent)
        self.setupUi(self)
        timer = QtCore.QTimer(self)
        timer.timeout.connect(self.reload_data)
        timer.start(60*1000)
        self.reload_data()

    def reload_data(self):
        self.tableWidget.clear()
        self.tableWidget.setColumnCount(7)

        cur.execute("SELECT * FROM clinic WHERE Extra_Notice LIKE %s",("%{}%".format('x-ray is required'),))
        test_list = cur.fetchall()
        queue = 1
        for row in test_list:
            c_id = row[0]
            p_id = row[1]
            cur.execute("SELECT * FROM patient WHERE id = '%s'"%(p_id))
            pt = cur.fetchall()[0]
            if pt:

                pt_name = pt[1]
                pt_age = pt[2]
                pt_address = pt[4]
                pt_phone = pt[3]

                button = QtGui.QPushButton('Make Operation')
                button.setStyleSheet("background-color: #4f81bc; color: white;")
                button.clicked.connect(lambda checked, p_id=p_id : self.open_report(p_id))

                rowposition = self.tableWidget.rowCount()

                self.tableWidget.insertRow(rowposition)

                for i, val in enumerate([queue, c_id, pt_name, pt_age, pt_address, pt_phone]):
                    self.tableWidget.setItem(rowposition , i , QtGui.QTableWidgetItem(str(val)))
                self.tableWidget.setCellWidget(rowposition , 6, button)
                queue += 1

    def open_report(self, p_id):
        self.child_win = report(p_id)
        self.child_win.show()
        sys.exit(app.exec_())
        return p_id

def main():
    app = QtGui.QApplication(sys.argv)
    app.setStyle('Plastique')
    main = First()
    main.update()
    main.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

以下是qdesign生成的ui设计代码：

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'main.ui'

# 

# Created: Sun Jul  1 17:18:19 2018

# by: PyQt4 UI code generator 4.10

# 

# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui
import datetime
import MySQLdb
import r_rc
import r_new_rc

db = MySQLdb.connect(host="localhost",    # your host, usually localhost
                     user="root",         # your username
                     passwd="***************",  # your password
                     db="health",
                     port=3306)        # name of the data base

cur = db.cursor()

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class AlignDelegate(QtGui.QItemDelegate):
    def paint(self, painter, option, index):
        option.displayAlignment = QtCore.Qt.AlignCenter
        QtGui.QItemDelegate.paint(self, painter, option, index)

class Ui_MainWindow(object):
    date = datetime.datetime.now().strftime ("%d - %m - %Y")

    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(723, 372)
        MainWindow.setStyleSheet(_fromUtf8("background-color: qradialgradient(spread:pad, cx:0.5, cy:0.5, radius:0.5, fx:0.488636, fy:0.506, stop:0.443182 rgba(135, 164, 207, 255), stop:0.9375 rgba(0, 0, 164, 255));"))
        MainWindow.setAnimated(True)
        MainWindow.setDocumentMode(False)
        MainWindow.setUnifiedTitleAndToolBarOnMac(False)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.label2 = QtGui.QLabel(self.centralwidget)
        self.label2.setGeometry(QtCore.QRect(120, 10, 481, 51))
        self.label2.setStyleSheet(_fromUtf8("background-color: #0000a4;color: gray;\n"
"font: 75 18pt \"Arial\";\n"))
        self.label2.setObjectName(_fromUtf8("textEdit"))
        self.label2.setText('                    Analysis & Rays')
        self.lineEdit = QtGui.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(210, 70, 321, 31))
        self.lineEdit.setStyleSheet(_fromUtf8("background-color: rgb(255, 255, 255);"))
        self.lineEdit.setObjectName(_fromUtf8("lineEdit"))
        self.lineEdit.setText(self.date)
        self.lineEdit.setReadOnly(True)
        self.tableWidget = QtGui.QTableWidget(self.centralwidget)
        self.tableWidget.setGeometry(QtCore.QRect(10, 120, 701, 231))
        sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Fixed, QtGui.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.tableWidget.sizePolicy().hasHeightForWidth())
        self.tableWidget.setSizePolicy(sizePolicy)
        self.tableWidget.setMaximumSize(QtCore.QSize(800, 500))
        self.tableWidget.setStyleSheet(_fromUtf8("background-color: rgb(255, 255, 255);"))
        self.tableWidget.setObjectName(_fromUtf8("tableWidget"))
        self.tableWidget.setItemDelegate(AlignDelegate())
        self.tableWidget.verticalHeader().hide()
        self.tableWidget.setHorizontalHeaderLabels(("Queue number;ID;Name;Age;Address;Phone;Make Operation;").split(";"))
        header = self.tableWidget.horizontalHeader()
        header.setResizeMode(0, QtGui.QHeaderView.Stretch)
        header.setResizeMode(1, QtGui.QHeaderView.ResizeToContents)
        header.setResizeMode(2, QtGui.QHeaderView.ResizeToContents)

        self.label = QtGui.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(640, 0, 31, 51))
        self.label.setObjectName(_fromUtf8("label"))
        #self.label_2 = QtGui.QLabel(self.centralwidget)
        #self.label_2.setGeometry(QtCore.QRect(450, 0, 70, 65))
        #self.label_2.setStyleSheet(_fromUtf8("background-color: rgb(255, 255, 255);"))
        #self.label_2.setObjectName(_fromUtf8("label_2"))
        MainWindow.setCentralWidget(self.centralwidget)
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
        self.label.setText(_translate("MainWindow", "<html><head/><body><p><img src=\":/newPrefix//444.png\"/></p></body></html>", None))
        ##self.label_2.setText(_translate("MainWindow", "<html><head/><body><p><img src=\":/newPrefix/36611129_2021894281460024_9133838233774325760_n.png\"/></p></body></html>", None))

我需要做的是每一分钟重新更新一次tablewidget，剩下的代码只是gui中其他元素的设计，以便它显示从db获取的新项
代码正常执行，但我在控制台中不断收到这个错误，更新没有发生 TypeError: paintEvent() takes exactly 1 argument (2 given) 更新
我删除了paint事件函数，并尝试向代码的主循环中添加一个普通计时器。
如上面的代码所示，它现在可以工作了，但是每1分钟就添加一个空行，循环将永远继续向表中添加空行。