QThread выполняется дважды

Question

У меня странная ошибка в моем коде, и я действительно изо всех сил пытаюсь найти причину. У меня есть небольшое gui -приложение, которое выполняет некоторые вычисления и должно выводить результаты процесса в gui.

Чтобы избежать зависаний приложения, я хотел использовать QThread, поэтому, когда моя кнопка по щелчку запускается функция:

def play_simulation(self):
    self.thread = ProductionProcess()
    print('Aufruf')
    self.thread.start()

Мой поток выглядит следующим образом:

class ProductionProcess(QThread):

    def __init__(self):
        QThread.__init__(self)
        self.iteration = 0

    def __del__(self):
        self.wait()

    def run(self):
        while self.iteration < 5:
            print(self.iteration)
            self.iteration = self.iteration + 1
            #self.machine_one_no_variation_status.emit(random.randint(0,100))
            self.sleep(2)

К сожалению, программа все еще зависает, первый раз поток запускается, но из-за отсутствия активности пользователя в gui он запускает поток во второй раз, и тогда я могу использовать gui, как предсказано с QThread.

Любые идеи, в чем моя проблема? Вся программа такова:

from PyQt5 import QtWidgets, uic, QtGui
from PyQt5.QtGui import QIcon, QPixmap
from PyQt5.QtCore import Qt, QThread, pyqtSignal
import time
import random

class  PlayEOVE(QtWidgets.QWidget):
    def __init__(self, main_window, parent=None):
        super().__init__(parent)
        self.ui = uic.loadUi('LeanPlayground/gui/EffectOfVariationExample.ui', self)
        self.show()
        self.main_window = main_window
        self.loadAssets()
        self.reset_stats()

        # Stockhandler
        self.ui.imgStock2.setPixmap(QPixmap('LeanPlayground/assets/stock_empty.png'))
        self.ui.imgStock3.setPixmap(QPixmap('LeanPlayground/assets/stock_empty.png'))
        self.ui.imgFGStock.setPixmap(QPixmap('LeanPlayground/assets/stock_empty.png'))

        self.actions()


    def actions(self):
        # actions
        self.ui.btnPlaySimulation.clicked.connect(self.play_simulation)
        self.ui.btnResetSimulation.clicked.connect(self.reset_stats)
        self.ui.timeSlider.valueChanged.connect(self.set_simulation_speed)
        self.ui.btnPlaySimulation.clicked.connect(self.play_simulation)
        self.ui.btnPauseSimulation.released.connect(self.pause_simulation)

    def pause_simulation(self):
        self.simulation_active = False

    def closeEvent(self, event):
        self.main_window.show()

    def loadAssets(self):
        # machines
        self.ui.imgMachine1.setPixmap(QPixmap('LeanPlayground/assets/machine.png'))
        self.ui.imgMachine2.setPixmap(QPixmap('LeanPlayground/assets/machine.png'))
        self.ui.imgMachine3.setPixmap(QPixmap('LeanPlayground/assets/machine.png'))

        #Stocks
        self.ui.imgStock2.setPixmap(QPixmap('LeanPlayground/assets/stock_filled_full.png'))
        self.ui.imgStock3.setPixmap(QPixmap('LeanPlayground/assets/stock_filled_half.png'))
        self.ui.imgFGStock.setPixmap(QPixmap('LeanPlayground/assets/stock_empty.png'))

    def play_simulation(self):
        #self.simulation_active = True
        #self.simulation_thread = threading.Thread(target=self.actions(), args=(1,))
        #self.simulation_thread.start()
        #self.simulate()
        self.thread = ProductionProcess()
        print('Aufruf')
        #self.thread.machine_one_no_variation_status.connect(self.test)
        self.thread.start()




    def test(self, val):
        self.ui.pgBarMachineOneNoVariation.setValue(val)


    def set_simulation_speed(self):
        self.simulation_speed = self.ui.timeSlider.value()
        self.ui.dataTimeSlider.setText(str(float(self.simulation_speed)) + " %")

    def reset_stats(self):
        #calculation Vars
        self.simulation_active = False
        self.iteration = 0
        self.simulation_speed = self.ui.timeSlider.value()
        self.stock_level_2_no_variation = 0
        self.stock_level_3_no_variation = 0
        self.stock_level_FG_no_variation = 0
        self.stock_level_2_with_variation = 0
        self.stock_level_3_with_variation = 0
        self.stock_level_FG_with_variation = 0
        self.machine_one_with_variation_status = 0
        self.machine_two_with_variation_status = 0
        self.machine_three_with_variation_status = 0
        self.machine_one_no_variation_status = 0
        self.machine_two_no_variation_status = 0
        self.machine_three_no_variation_status = 0

        self.write_to_frontend()

    def write_to_frontend(self):
        self.ui.pgBarMachineOneNoVariation.setValue(self.machine_one_no_variation_status)
        self.ui.pgBarMachineOneWithVariation.setValue(self.machine_one_with_variation_status)
        self.ui.pgBarMachineThreeWithVariation.setValue(self.machine_three_with_variation_status)
        self.ui.pgBarMachineTwoNoVariation.setValue(self.machine_two_no_variation_status)
        self.ui.pgBarMachineTwoWithVariation.setValue(self.machine_two_with_variation_status)
        self.ui.pgBarmachineThreeNoVariation.setValue(self.machine_three_no_variation_status)

        # Fill Textfields
        self.ui.dataTime.setText(str(self.iteration) + ' min')
        self.set_simulation_speed()
        self.ui.dataStockFinishedProductsNoVariation.setText(str(self.stock_level_FG_no_variation))
        self.ui.dataStockFinishedProductsWithVariation.setText(str(self.stock_level_FG_with_variation))


class ProductionProcess(QThread):

    def __init__(self):
        QThread.__init__(self)
        self.iteration = 0

    def __del__(self):
        self.wait()

    def run(self):
        while self.iteration < 5:
            print(self.iteration)
            self.iteration = self.iteration + 1
            #self.machine_one_no_variation_status.emit(random.randint(0,100))
            self.sleep(2)