Auto key presser

from time import sleep
from PyQt5 import QtCore, QtGui, QtWidgets
from pynput.keyboard import Key, Controller

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(402, 256)
        font = QtGui.QFont()
        font.setPointSize(12)
        MainWindow.setFont(font)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(140, 50, 113, 21))
        self.lineEdit.setMaxLength(4)
        self.lineEdit.setObjectName("lineEdit")
        self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_2.setGeometry(QtCore.QRect(140, 110, 113, 20))
        self.lineEdit_2.setMaxLength(1)
        self.lineEdit_2.setObjectName("lineEdit_2")
        self.StartBtn = QtWidgets.QPushButton(self.centralwidget)
        self.StartBtn.setGeometry(QtCore.QRect(30, 200, 141, 31))
        self.StartBtn.setObjectName("StartBtn")
        self.StopBtn = QtWidgets.QPushButton(self.centralwidget)
        self.StopBtn.setGeometry(QtCore.QRect(220, 200, 151, 31))
        self.StopBtn.setObjectName("StopBtn")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(10, 20, 381, 21))
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(70, 80, 261, 21))
        self.label_2.setObjectName("label_2")
        self.label_3 = QtWidgets.QLabel(self.centralwidget)
        self.label_3.setGeometry(QtCore.QRect(100, 140, 191, 20))
        self.label_3.setObjectName("label_3")
        self.lineEdit_3 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_3.setGeometry(QtCore.QRect(140, 170, 113, 20))
        self.lineEdit_3.setMaxLength(3)
        self.lineEdit_3.setObjectName("lineEdit_3")
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

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

        self.StartBtn.clicked.connect(self.start)
        self.StopBtn.clicked.connect(self.stop)


    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "Auto Key presser"))
        self.StartBtn.setText(_translate("MainWindow", "Start"))
        self.StopBtn.setText(_translate("MainWindow", "Stop"))
        self.label.setText(_translate("MainWindow", "How many points does the last move of your df has?"))
        self.label_2.setText(_translate("MainWindow", "What key you need to keep pressing"))
        self.label_3.setText(_translate("MainWindow", "every how many seconds?"))

    def stop(self):
        sys.exit()

    def start(self):
        i = 0
        repeat = int(self.lineEdit.text())
        keyboard = Controller()
        key_value = self.lineEdit_2.text()
        time_value = int(self.lineEdit_3.text())
        while i < repeat:
            keyboard.press(key_value)
            keyboard.release(key_value)
            print('Key has been pressed', i,'!')
            sleep(time_value)
            i += 1

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_())