How do I update button when a string is printed?

[sdf1444]

Hi

When this is executed "print("Hello World! Im a laser")" in laser.py I want the "Turn on" button to change to "ON". How would this be done? Run GUI.py to test and laser.py is the file to import.

GUI.py

import paho.mqtt.client as mqtt
import os
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5 import QtWidgets, uic
from mqtt import *
import json

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self,parent = None):
        QMainWindow.__init__(self)
        super(MainWindow, self).__init__(parent)
        self.mdi = QMdiArea()
        self.setCentralWidget(self.mdi)

        self.setMinimumSize(QSize(800, 600))
        self.setWindowTitle("PyQt button example - pythonprogramminglanguage.com")

        pybutton = QPushButton('Add device', self)

        pybutton.clicked.connect(self.importbutton)

        pybutton.move(100, 400)
        pybutton.resize(150, 32)

        self.textbox = QLineEdit(self)
        self.textbox.move(100,350)
        self.textbox.resize(100, 32)
        
        self.fileName_UI = ""

    def importbutton(self):
        self.fileName_UI = self.textbox.text()
        self.loadGUI()

    def getGUIFilename(self):
        return self.fileName_UI

    def loadGUI(self):
        print("Searching file", self.fileName_UI)       
        try:
            module = __import__(self.fileName_UI)
            my_class = getattr(module, "SubWindow")

            sub = QMdiSubWindow()

            sub.setWidget(my_class())
            sub.setWindowTitle("New GUI:  " + self.fileName_UI)
            self.mdi.addSubWindow(sub)
            sub.show()

            print("creating new instance " + self.fileName_UI)
            client = device("Device")
            client.run()

            client.loop_start()  # start the loop
            device_message = self.fileName_UI
            time.sleep(2)
            print("Subscribing to topic", "microscope/light_sheet_microscope/UI")
            client.subscribe("microscope/light_sheet_microscope/UI")
            print("Publishing message to topic", "microscope/light_sheet_microscope/UI")
            client.publish("microscope/light_sheet_microscope/UI", json.dumps({"type": "device", "payload":{"name": self.fileName_UI, "cmd": "adding device"}}, indent=2))
            time.sleep(1)  # wait
            client.loop_stop()  # stop the loop
            print("Device added" + "\n")

            client.loop_start()
            time.sleep(2)
            print("Subscribing to topic", "microscope/light_sheet_microscope/UI/list_of_devices")
            client.subscribe("microscope/light_sheet_microscope/UI/list_of_devices")
            print("Publishing message to topic", "microscope/light_sheet_microscope/UI/list_of_devices")
            client.publish("microscope/light_sheet_microscope/UI/list_of_devices", self.fileName_UI + " added to device list")
            time.sleep(1)
            client.loop_stop()

            listofdevices = []
            listofdevices.append(self.fileName_UI)
            with open("list_of_devices.txt", "a+") as myfile:
                for item in listofdevices:
                    myfile.write(item + " ")
            print(item + " added to device list")

            def readFile(fname):
            	try:
            		with open(fname, "r") as f:
            			for item in f:
            				print("List of devices added: " + item + " ")
            	except:
            		print("No devices added yet")
            readFile("list_of_devices.txt")
        except:
            print("creating new instance " + self.fileName_UI)
            client = device("Device")
            client.run()

            client.loop_start()  # start the loop
            device_message = self.fileName_UI
            time.sleep(2)
            print("Subscribing to topic", "microscope/light_sheet_microscope/UI")
            client.subscribe("microscope/light_sheet_microscope/UI")
            print("Publishing message to topic", "microscope/light_sheet_microscope/UI")
            client.publish("microscope/light_sheet_microscope/UI", json.dumps({"type": "device", "payload":{"name": self.fileName_UI}}, indent=2))
            time.sleep(2)  # wait
            client.loop_stop()  # stop the loop
            print(device_message + ".py " + "file doesn't exist")
            print("Device not added")

if __name__ == "__main__":
    app = QApplication(sys.argv)
    mainWin = MainWindow()
    mainWin.show()
    try:
        mainWin.show()
        os.remove("list_of_devices.txt")
        print("Awaiting devices to be launched")
    except:
        print("Awaiting devices to be launched")
    publishedMessage = mainWin.getGUIFilename()
    sys.exit(app.exec_())

laser.py

from PyQt5 import QtCore, QtGui, QtWidgets
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5 import QtWidgets, uic
from mqtt import *
import json

class SubWindow(QWidget):
    def __init__(self, parent = None):
        super(SubWindow, self).__init__(parent)
        self.setMinimumSize(QSize(300, 200))
        label = QLabel("Laser",  self)
        
        self.Button = QtWidgets.QPushButton("Turn on",self)        
        self.Button.clicked.connect(self.on)        
        self.Button.setGeometry(QtCore.QRect(10, 40, 81, 23))
        self.Button2 = QtWidgets.QPushButton("Status", self)
        self.Button2.clicked.connect(self.status)
        self.Button2.setGeometry(QtCore.QRect(20, 40, 81, 23))
        self.Button2.move(220,10)

    def status(self):
        client = device("Laser")
        client.run()

        client.loop_start()
        default_status = ("Uninitialised")
        time.sleep(2)
        print("Subscribing to topic", "microscope/light_sheet_microscope/UI")        
        client.subscribe("microscope/light_sheet_microscope/UI")
        print("Publishing message to topic", "microscope/light_sheet_microscope/UI", json.dumps({"type": "device", "payload":{"name": "laser", "status": default_status}}))  
        print("Current status = " + default_status)
        client.loop_stop()  # stop the loop

    def on(self):
        client = device("Laser")
        client.run()

        client.loop_start()
        uninitialised_status = "Uninitialised"
        time.sleep(2)
        print("Subscribing to topic", "microscope/light_sheet_microscope/UI")        
        client.subscribe("microscope/light_sheet_microscope/UI")
        print("Publishing message to topic", "microscope/light_sheet_microscope/UI", json.dumps({"type": "device", "payload":{"name": "laser", "status": uninitialised_status}}))  
        print("Current status = " + uninitialised_status)
        client.loop_stop()  # stop the loop

        client.loop_start()
        initialising_status = "Initialising"
        time.sleep(2)
        print("Subscribing to topic", "microscope/light_sheet_microscope/UI")        
        client.subscribe("microscope/light_sheet_microscope/UI")
        print("Publishing message to topic", "microscope/light_sheet_microscope/UI", json.dumps({"type": "device", "payload":{"name": "laser", "status": initialising_status}}))  
        print("Current status = " + initialising_status)
        client.loop_stop()  # stop the loop

        client.loop_start()
        initialised_status = "Initialised"
        time.sleep(2)
        print("Subscribing to topic", "microscope/light_sheet_microscope/UI")        
        client.subscribe("microscope/light_sheet_microscope/UI")
        print("Publishing message to topic", "microscope/light_sheet_microscope/UI", json.dumps({"type": "device", "payload":{"name": "laser", "status": initialised_status}}))  
        print("Current status = " + initialised_status)
        client.loop_stop()  # stop the loop

        client.loop_start()
        configuring_status = "Configuring"
        time.sleep(2)
        print("Subscribing to topic", "microscope/light_sheet_microscope/UI")        
        client.subscribe("microscope/light_sheet_microscope/UI")
        print("Publishing message to topic", "microscope/light_sheet_microscope/UI", json.dumps({"type": "device", "payload":{"name": "laser", "status": configuring_status}}))  
        print("Current status = " + configuring_status)
        client.loop_stop()  # stop the loop

        client.loop_start()
        configured_status = "Configured"
        time.sleep(2)
        print("Subscribing to topic", "microscope/light_sheet_microscope/UI")        
        client.subscribe("microscope/light_sheet_microscope/UI")
        print("Publishing message to topic", "microscope/light_sheet_microscope/UI", json.dumps({"type": "device", "payload":{"name": "laser", "status": configured_status}}))  
        print("Current status = " + configured_status)
        client.loop_stop()  # stop the loop

        client.loop_start()
        run_status = "run"
        time.sleep(2)
        print("Subscribing to topic", "microscope/light_sheet_microscope/UI")        
        client.subscribe("microscope/light_sheet_microscope/UI")
        print("Publishing message to topic", "microscope/light_sheet_microscope/UI", json.dumps({"type": "device", "payload":{"name": "laser", "status": run_status}}))  
        print("Current status = " + run_status)
        client.loop_stop()  # stop the loop

        print("Hello World! Im a laser")

    def closeEvent(self, event):
        self.close()

Thanks

[Gojir4]

@sdf1444 Hi,

print("Hello World! Im a laser")
self.Button.setText("On")