求大佬指点

#主程序
import sys
from PySide2.QtWidgets import *
from PySide2.QtCore import *
from PySide2.QtGui import *
from ui_mainwindow import Ui_MainWindow


class DianJi(QMainWindow, Ui_MainWindow):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
        self.show()
    
    def setup(self):
        self.l = 0
        self.r = 0

        self.pbtn_L1.clicked.connect(self.pbtn_1)
        self.pbtn_R1.clicked.connect(self.pbtn_2)
        self.pbtn_L2.clicked.connect(self.pbtn_3)
        self.pbtn_R2.clicked.connect(self.pbtn_4)

    def pbtn_1(self):
        self.l += 1
        self.lb_L.setText(self.l)

    def pbtn_2(self):
        self.r += 1
        self.lb_R.setText(self.r)

    def pbtn_1(self):
        self.l -= 1
        self.lb_L.setText(self.l)

    def pbtn_2(self):
        self.r -= 1
        self.lb_R.setText(self.r)



if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = DianJi()
    sys.exit(app.exec_())

#ui_mainwindow

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

################################################################################
## Form generated from reading UI file 'mainwindow.ui'
##
## Created by: Qt User Interface Compiler version 5.15.2
##
## WARNING! All changes made in this file will be lost when recompiling UI file!
################################################################################

from PySide2.QtCore import *
from PySide2.QtGui import *
from PySide2.QtWidgets import *


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        if not MainWindow.objectName():
            MainWindow.setObjectName(u"MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QWidget(MainWindow)
        self.centralwidget.setObjectName(u"centralwidget")
        self.lb_L = QLabel(self.centralwidget)
        self.lb_L.setObjectName(u"lb_L")
        self.lb_L.setGeometry(QRect(60, 50, 211, 491))
        font = QFont()
        font.setPointSize(70)
        self.lb_L.setFont(font)
        self.lb_L.setAlignment(Qt.AlignCenter)
        self.lb_R = QLabel(self.centralwidget)
        self.lb_R.setObjectName(u"lb_R")
        self.lb_R.setGeometry(QRect(530, 50, 211, 491))
        self.lb_R.setFont(font)
        self.lb_R.setAlignment(Qt.AlignCenter)
        self.pbtn_L1 = QPushButton(self.centralwidget)
        self.pbtn_L1.setObjectName(u"pbtn_L1")
        self.pbtn_L1.setGeometry(QRect(140, 50, 51, 51))
        font1 = QFont()
        font1.setPointSize(40)
        font1.setBold(True)
        font1.setWeight(75)
        self.pbtn_L1.setFont(font1)
        self.pbtn_R1 = QPushButton(self.centralwidget)
        self.pbtn_R1.setObjectName(u"pbtn_R1")
        self.pbtn_R1.setGeometry(QRect(610, 50, 51, 51))
        self.pbtn_R1.setFont(font1)
        self.pbtn_L2 = QPushButton(self.centralwidget)
        self.pbtn_L2.setObjectName(u"pbtn_L2")
        self.pbtn_L2.setGeometry(QRect(140, 490, 51, 51))
        self.pbtn_L2.setFont(font1)
        self.pbtn_R2 = QPushButton(self.centralwidget)
        self.pbtn_R2.setObjectName(u"pbtn_R2")
        self.pbtn_R2.setGeometry(QRect(610, 490, 51, 51))
        self.pbtn_R2.setFont(font1)
        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)

        QMetaObject.connectSlotsByName(MainWindow)
    # setupUi

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(QCoreApplication.translate("MainWindow", u"dianji", None))
        self.lb_L.setText(QCoreApplication.translate("MainWindow", u"0", None))
        self.lb_R.setText(QCoreApplication.translate("MainWindow", u"0", None))
        self.pbtn_L1.setText(QCoreApplication.translate("MainWindow", u"+", None))
        self.pbtn_R1.setText(QCoreApplication.translate("MainWindow", u"+", None))
        self.pbtn_L2.setText(QCoreApplication.translate("MainWindow", u"-", None))
        self.pbtn_R2.setText(QCoreApplication.translate("MainWindow", u"-", None))
    # retranslateUi