在PYQT5 python中设置文本

我的程序是基于人工智能的。我在 stackoverflow 中看到了所有关于 Pyqt 设置文本的帖子。我想在单击“自动（AI）”按钮时在 lineEdit 中设置文本。

def AI_click(self):
        #self.lineEdit.setText("YO")
        os.system('python detect_video.py --weights ./checkpoints/custom-416 --size 416 --model yolov4 --video 0 --plate')
        #self.lineEdit.setText(line1)

基本上AI按钮执行py文件并打印字符串。如何在此 GUI py 文件中使用另一个 .py 字符串。当我的程序执行 py 文件时，它不再记得了self.lineEdit.setText(line1)还有字符串。

class Ui_Dialog(object):
def setupUi(self, Dialog,var):
    Dialog.setObjectName("Dialog")
    Dialog.resize(1120, 850)
    Dialog.setStyleSheet("QDialog#Dialog{\n""background-color: 
    qlineargradient(spread:pad,x1:0.0113636, y1:0.966, x2:1, y2:0, 
    stop:0 rgba(0, 0, 0, 255), stop:1 rgba(255, 255, 255, 255))\n"
    "\n"
    "}\n"
    "\n"
    "")
    self.widget = QtWidgets.QWidget(Dialog)
    self.widget.setGeometry(QtCore.QRect(0, 0, 201, 851))
    self.widget.setStyleSheet("\n"
    "background-color: rgb(100, 100, 100);")
    self.widget.setObjectName("widget")
    self.dashboardButton = QtWidgets.QPushButton(self.widget)
    self.dashboardButton.setGeometry(QtCore.QRect(0, 250, 201, 51))
    self.dashboardButton.setStyleSheet("QPushButton {\n"
    "    background-color: rgb(255, 255, 255);\n"
    "    color: #FFFFFF;\n"
    "    \n"
    "    padding: 2px;\n"
    "    font: bold 20px; color:black;\n"
    "    \n"
    "    \n"
    "   }\n"
    "QPushButton:hover {\n"
    "    background-color: rgb(98, 98, 98);\n"
    "}")
    self.dashboardButton.setObjectName("dashboardButton")
    self.dashboardButton_2 = QtWidgets.QPushButton(self.widget)
    self.dashboardButton_2.setGeometry(QtCore.QRect(0, 370, 201, 51))
    self.dashboardButton_2.setStyleSheet("QPushButton {\n"
    "    background-color: rgb(255, 255, 255);\n"
    "    color: #FFFFFF;\n"
    "    \n"
    "    padding: 2px;\n"
    "    font: bold 20px; color:black;\n"
    "    \n"
    "    \n"
    "   }\n"
    "QPushButton:hover {\n"
    "    background-color: rgb(98, 98, 98);\n"
    "}")
    self.dashboardButton_2.setObjectName("dashboardButton_2")
    self.label = QtWidgets.QLabel(Dialog)
    self.label.setGeometry(QtCore.QRect(250, 20, 171, 91))
    self.label.setStyleSheet("font-size: 30px;\n"
    "font: bold;\n"
    "")
    self.label.setObjectName("label")
    self.label_2 = QtWidgets.QLabel(Dialog)
    self.label_2.setGeometry(QtCore.QRect(630, 70, 416, 416))
    self.label_2.setText("")
    self.label_2.setPixmap(QtGui.QPixmap("D:/Downloads/numplate.jpg"))
    self.label_2.setScaledContents(True)
    self.label_2.setObjectName("label_2")
    self.label_3 = QtWidgets.QLabel(Dialog)
    self.label_3.setGeometry(QtCore.QRect(640, 530, 401, 241))
    self.label_3.setText("")
    self.label_3.setPixmap(QtGui.QPixmap("D:/Downloads/20886263.jpg"))
    self.label_3.setScaledContents(True)
    self.label_3.setObjectName("label_3")
    self.lineEdit = QtWidgets.QLineEdit(Dialog)
    #self.lineEdit.setText("YO")
    # if string!=None:
    #         print("called")
    #         print(string)
    #         self.lineEdit.setText(string)
    self.lineEdit.setGeometry(QtCore.QRect(300, 280, 221, 41))
    self.lineEdit.setObjectName("lineEdit")
    
    self.lineEdit_2 = QtWidgets.QLineEdit(Dialog)
    self.lineEdit_2.setGeometry(QtCore.QRect(300, 360, 221, 41))
    self.lineEdit_2.setObjectName("lineEdit_2")
    self.label_4 = QtWidgets.QLabel(Dialog)
    self.label_4.setGeometry(QtCore.QRect(300, 260, 81, 16))
    self.label_4.setObjectName("label_4")
    self.label_5 = QtWidgets.QLabel(Dialog)
    self.label_5.setGeometry(QtCore.QRect(300, 340, 81, 16))
    self.label_5.setObjectName("label_5")
    self.pushButton = QtWidgets.QPushButton(Dialog)
    self.pushButton.setGeometry(QtCore.QRect(420, 430, 101, 31))
    self.pushButton.setObjectName("pushButton")
    self.pushButton_AI = QtWidgets.QPushButton(Dialog)
    self.pushButton_AI.setGeometry(QtCore.QRect(300, 430, 101, 31))
    self.pushButton_AI.setObjectName("pushButton_AI")

    print("car:"+var)
    self.pushButton.clicked.connect(self.clickme)
    self.pushButton_AI.clicked.connect(self.AI_click)
    lineEdit= self.lineEdit
    self.retranslateUi(Dialog)
    QtCore.QMetaObject.connectSlotsByName(Dialog)
def AI_click(self):
        #self.lineEdit.setText("YO")
        os.system('python detect_video.py --weights ./checkpoints/custom-416 --size 416 --model yolov4 --video 0 --plate')
        #self.lineEdit.setText(line1)


def clickme(self):
    np=self.lineEdit.text()
    cnic=self.lineEdit_2.text()
    table_data(np,cnic)
    
    # printing pressed
    print(np+cnic)
def retranslateUi(self, Dialog):
    _translate = QtCore.QCoreApplication.translate
    Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
    self.dashboardButton.setText(_translate("Dialog", "Dashboard"))
    self.dashboardButton_2.setText(_translate("Dialog", "Record"))
    self.label.setText(_translate("Dialog", "Dashboard"))
    self.label_4.setText(_translate("Dialog", "Number Plate:"))
    self.label_5.setText(_translate("Dialog", "CNIC:"))
    self.pushButton.setText(_translate("Dialog", "Save "))
    self.pushButton_AI.setText(_translate("Dialog", "Auto"))
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
Dialog = QtWidgets.QDialog()
ui = Ui_Dialog()
var=""
ui.setupUi(Dialog,var)
Dialog.show()
sys.exit(app.exec_())

感谢@musicamante 而不是使用os.system('python detect_video.py --weights ./checkpoints/custom-416 --size 416 --model yolov4 --video 0 --plate')用这个

def AI_click(self):
        
        s=subprocess.Popen(['python', 'detect_video.py' ,'--weights' 
        ,'./checkpoints/custom-416' ,'--size', '416' ,
        '--model', 'yolov4' ,'--video', '0' ,'--plate'], stdout=subprocess.PIPE)
        output = s.stdout.read()
        s=output.decode()
        self.lineEdit.setText(s)

在其他.py文件中应该有打印功能