最近开始学习Python库PyQt5（5.14.2），决定写一个小浏览器。
我遇到了一个错误：
RuntimeError: QPushButton 类型的包装 C/C++ 对象已被删除分段错误（内存堆栈刷新到磁盘）。
Python 3.6 版。这是来自 Qt 设计器的文件代码：
from PyQt5 import QtCore, QtGui, QtWidgets
#from PyQt5 import QtWebKitWidgets
from PyQt5.QtWebEngine import *
from PyQt5.QtWebEngineWidgets import *
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(593, 397)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
self.lineEdit.setGeometry(QtCore.QRect(190, 30, 351, 25))
self.lineEdit.setObjectName("lineEdit")
self.pushButton = QtWidgets.QPushButton(self.centralwidget)
self.pushButton.setGeometry(QtCore.QRect(540, 30, 41, 25))
self.pushButton.setStyleSheet("QPushButton{\n"
"background-color:red;\n"
"\n"
"}\n"
"\n"
"")
self.pushButton.setObjectName("pushButton")
self.horizontalLayoutWidget = QtWidgets.QWidget(self.centralwidget)
self.horizontalLayoutWidget.setGeometry(QtCore.QRect(10, 30, 254, 31))
self.horizontalLayoutWidget.setObjectName("horizontalLayoutWidget")
self.horizontalLayout = QtWidgets.QHBoxLayout(self.horizontalLayoutWidget)
self.horizontalLayout.setContentsMargins(0, 0, 0, 0)
self.horizontalLayout.setObjectName("horizontalLayout")
self.pushButton_3 = QtWidgets.QPushButton(self.horizontalLayoutWidget)
self.pushButton_3.setObjectName("pushButton_3")
self.horizontalLayout.addWidget(self.pushButton_3)
self.pushButton_4 = QtWidgets.QPushButton(self.horizontalLayoutWidget)
self.pushButton_4.setObjectName("pushButton_4")
self.horizontalLayout.addWidget(self.pushButton_4)
self.pushButton_2 = QtWidgets.QPushButton(self.horizontalLayoutWidget)
self.pushButton_2.setObjectName("pushButton_2")
self.horizontalLayout.addWidget(self.pushButton_2)
self.line = QtWidgets.QFrame(self.centralwidget)
self.line.setGeometry(QtCore.QRect(0, 50, 591, 21))
self.line.setFrameShape(QtWidgets.QFrame.HLine)
self.line.setFrameShadow(QtWidgets.QFrame.Sunken)
self.line.setObjectName("line")
self.line_2 = QtWidgets.QFrame(self.centralwidget)
self.line_2.setGeometry(QtCore.QRect(0, 20, 591, 20))
self.line_2.setFrameShape(QtWidgets.QFrame.HLine)
self.line_2.setFrameShadow(QtWidgets.QFrame.Sunken)
self.line_2.setObjectName("line_2")
self.label = QtWidgets.QLabel(self.centralwidget)
self.label.setGeometry(QtCore.QRect(10, 0, 67, 17))
self.label.setObjectName("label")
###
# self.webView = QtWebKitWidgets.QWebView(self.centralwidget)
self.webView = QWebEngineView(self.centralwidget) # +++
self.webView.setGeometry(QtCore.QRect(10, 60, 591, 291))
self.webView.setUrl(QtCore.QUrl("about:blank"))
self.webView.setObjectName("webView")
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 593, 20))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.lineEdit.setText(_translate("MainWindow", "search"))
self.pushButton.setText(_translate("MainWindow", ">>>"))
self.pushButton_3.setText(_translate("MainWindow", "<"))
self.pushButton_4.setText(_translate("MainWindow", "rm"))
self.pushButton_2.setText(_translate("MainWindow", ">"))
self.label.setText(_translate("MainWindow", "SBrowser"))
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
这是编写应用程序逻辑的文件的代码：
from PyQt5 import QtCore, QtGui, QtWidgets
import codecs
import sys
from PyQt5.QtCore import *
from bro22 import Ui_MainWindow
from PyQt5.QtCore import QUrl
from PyQt5.QtWidgets import QMainWindow, QApplication
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWebEngine import *
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
app = QApplication(sys.argv)
def serch():
i ='http://www.google.com/search?q='+ ui.lineEdit.text()
print(i)
ui.webView.load(QUrl(i))
ui.webView.show()
def rm():
pass
ui.pushButton_4.clicked.connect(rm)
ui.pushButton.clicked.connect(search)
web = QWebEngineView()
sys.exit(app.exec_())
请帮帮我。提前致谢！