How to link an Analog Var with Qt Lcd Number - python-3.x

Question

i am working on a small project
I have a potentiometer witch provide analog data via a serial com (like it's shown on the Com_Serial file )
so I want to read the data on the variable 'f' and show it on the QT lcd number
the interface File :
import sys
from PyQt5.QtWidgets import*
from PyQt5 import uic
from PyQt5 import*
from Com_Serial import f
class AppDemo(QWidget):
def __init__(self):
super().__init__()
uic.loadUi('app.ui', self)
self.Motor_Speed_Lcd.display(f)
if __name__ == '__main__':
app = QApplication(sys.argv)
demo = AppDemo()
demo.show()
try:
sys.exit(app.exec_())
except SystemExit:
print('Closing Window…')
the Com_Serial File :
import serial
ser= serial.Serial(port='com4', baudrate=115200, timeout=1)
while 1:
value = '1'
ser.write(value.encode())
Data = ser.readline()
x = ((Data))
f= (x[1:5])
f = x.decode()

Answer 1

The solution is to execute the infinite loop in a thread and send the information through signals.
import threading
import time
from PyQt5.QtCore import pyqtSignal, QObject
class SerialManager(QObject):
value_changed = pyqtSignal(str)
def start(self):
threading.Thread(target=self.run, daemon=True).start()
def run(self):
ser= serial.Serial(port='com4', baudrate=115200, timeout=1)
while ser.is_open:
value = '1'
ser.write(value.encode())
data = ser.readline()
f = data[1:5].decode()
self.value_changed.emit(f)
time.sleep(.1)
class AppDemo(QWidget):
def __init__(self):
super().__init__()
uic.loadUi('app.ui', self)
self.serial_manager = SerialManager()
self.serial_manager.value_changed.connect(self.Motor_Speed_Lcd.display)
self.serial_manager.start()