我想使用pyqt5创建一个GUI。我的要求是我想在显示器上打印随机值。.随机值的程序是用c编写的。我已经在python中成功运行了我的c代码通过名为“ subprocess”的python模块的脚本。c程序正确生成了随机值，但问题是我通过python创建的gui只接受了一个随机值，并在显示中显示了它。我的要求是GUI连续显示所有生成的值。

我使用了pyqt的lcdnumber小部件。.我附加了我的python和c的示例代码。

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

# Form implementation generated from reading ui file 'speedreading.ui'

# Created by: PyQt5 UI code generator 5.13.0

# WARNING! All changes made in this file will be lost!


from PyQt5 import QtCore,QtGui,QtWidgets
import threading
import subprocess
import time

def count():
    global read
    read=subprocess.call('./a.out')
    return read

t=threading.Thread(target=count)

class Ui_DigitalMeter(object):  
    def setupUi(self,DigitalMeter):
        DigitalMeter.setobjectname("DigitalMeter")
        DigitalMeter.resize(575,403)
        self.centralwidget = QtWidgets.QWidget(DigitalMeter)
        self.centralwidget.setobjectname("centralwidget")
        self.lcdNumber = QtWidgets.qlcdnumber(self.centralwidget)
        self.lcdNumber.setGeometry(QtCore.QRect(170,90,241,171))
        self.lcdNumber.setframeShape(QtWidgets.QFrame.StyledPanel)
        self.lcdNumber.setframeShadow(QtWidgets.QFrame.Raised)
        self.lcdNumber.setDigitCount(10)
        self.lcdNumber.setMode(QtWidgets.qlcdnumber.Dec)
        self.lcdNumber.setSegmentStyle(QtWidgets.qlcdnumber.flat)
        self.lcdNumber.display(count())
        self.lcdNumber.connect(count)
        self.lcdNumber.setobjectname("lcdNumber")
        DigitalMeter.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(DigitalMeter)
        self.menubar.setGeometry(QtCore.QRect(0,575,21))
        self.menubar.setobjectname("menubar")
        DigitalMeter.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(DigitalMeter)
        self.statusbar.setobjectname("statusbar")
        DigitalMeter.setStatusBar(self.statusbar)

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

    def retranslateUi(self,DigitalMeter):
        _translate = QtCore.QCoreApplication.translate
        DigitalMeter.setWindowTitle(_translate("DigitalMeter","MainWindow"))


if __name__ == "__main__":
    import sys
    t.start()
    app = QtWidgets.QApplication(sys.argv)
    DigitalMeter = QtWidgets.QMainWindow()
    ui = Ui_DigitalMeter()
    ui.setupUi(DigitalMeter)
    DigitalMeter.show()
    sys.exit(app.exec_())

c代码如下：

#include <stdio.h>
#include <stdlib.h>
#include<time.h>
int main()
{
  srand(time(0));
  int i=rand() % 20;
  printf("%d\n",i);

  return i;
}

请帮助我解决这个问题... 谢谢。