如何从python的sqlite中插入表

Question

我是python的新手，正在使用pyqt5和sqlite数据库创建gui应用程序。我发现我的程序可以连接数据库，但无法创建表并插入记录，当我按下按钮时显示'RESTART SHELL'< / p>

from PyQt5 import QtCore, QtGui, QtWidgets
import sqlite3

class DBHelper():
    def __init__(self):
        self.book=sqlite3.connect("Books.db")
        self.c=self.book.cursor()
        self.c.execute('''CREATE TABLE lib1(
        book_id INTEGER PRIMARY KEY AUTO INCREMENT,
        title TEXT,
        author TEXT,
        price INTEGER);''')
        self.c.execute("INSERT INTO lib1(book_id,title,author,price)VALUES(1,'python','allan downey',400);")
        self.c.execute("INSERT INTO lib1(book_id,title,author,price)VALUES(1,'c complete reference','Herbert Schieldt',400);")
        self.c.execute("INSERT INTO lib1(book_id,title,author,price)VALUES(2,'Harry Potter','J.K Rowling',800);")
        self.c.execute("INSERT INTO lib1(book_id,title,author,price)VALUES(3,'Half Girlfriend','chetan bhagath',400);")
        self.c.execute("INSERT INTO lib1(book_id,title,author,price)VALUES(4,'ponniyin selvan','kalki',400);")
    def searchBook(self,title):
        self.c.execute("SELECT price FROM lib1 WHERE title="+str(title))
        self.data=self.c.fetchone()
        if not self.data:
            QMessageBox.warning(QMessageBox(),'ERROR! COULD NOT FIND ANY BOOKK WITH THIS TITLE'+str(title1))
        self.c.close()
        self.book.close()
        return self.data
    def TotalCost(self,quantity):
        self.Total=self.data*self.quantity
        self.c.close()
        self.book.close()
        return self.total



class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(400, 300)
        self.verticalLayout = QtWidgets.QVBoxLayout(Form)
        self.verticalLayout.setObjectName("verticalLayout")
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.label = QtWidgets.QLabel(Form)
        self.label.setObjectName("label")
        self.horizontalLayout.addWidget(self.label)
        self.t1 = QtWidgets.QLineEdit(Form)
        self.t1.setObjectName("t1")
        self.horizontalLayout.addWidget(self.t1)
        self.b1 = QtWidgets.QPushButton(Form)
        self.b1.setObjectName("b1")
        self.b1.clicked.connect(self.buttonclicked1)
        self.horizontalLayout.addWidget(self.b1)
        self.verticalLayout.addLayout(self.horizontalLayout)
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.label_2 = QtWidgets.QLabel(Form)
        self.label_2.setObjectName("label_2")
        self.horizontalLayout_2.addWidget(self.label_2)
        self.verticalLayout.addLayout(self.horizontalLayout_2)
        self.horizontalLayout_3 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_3.setObjectName("horizontalLayout_3")
        self.label_3 = QtWidgets.QLabel(Form)
        self.label_3.setObjectName("label_3")
        self.horizontalLayout_3.addWidget(self.label_3)
        self.t2 = QtWidgets.QLineEdit(Form)
        self.t2.setObjectName("t2")
        self.horizontalLayout_3.addWidget(self.t2)
        self.b2 = QtWidgets.QPushButton(Form)
        self.b2.setObjectName("b2")
        self.b2.clicked.connect(self.buttonclicked2)
        self.horizontalLayout_3.addWidget(self.b2)
        self.verticalLayout.addLayout(self.horizontalLayout_3)
        self.horizontalLayout_4 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_4.setObjectName("horizontalLayout_4")
        self.label_4 = QtWidgets.QLabel(Form)
        self.label_4.setObjectName("label_4")
        self.horizontalLayout_4.addWidget(self.label_4)
        self.verticalLayout.addLayout(self.horizontalLayout_4)

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.label.setText(_translate("Form", "BOOK TITLE:"))
        self.b1.setText(_translate("Form", "FIND PRICE"))
        self.label_2.setText(_translate("Form", "PRICE:"))
        self.label_3.setText(_translate("Form", "QUANTITY:"))
        self.b2.setText(_translate("Form", "TOTAL"))
        self.label_4.setText(_translate("Form", "TOTAL:"))


    def buttonclicked1(self):
        self.p1=DBHelper()
        self.price=self.t1.text()
        self.p1.searchBook(self.price)

    def buttonclicked2(self):
        self.p2=DBHelper()
        self.total=self.t2.text()
        self.p2.TotalCost(self.total)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec_())

运行代码后，出现错误消息“ SHOWING RECORDS，RESTART SHELL”。有人可以帮我吗？谢谢