Программа начинает тормозить после долгой прорисовки графика с помощью pyqtgraph

Имеется программа, которая прорисовывает динамически изменяющийся график, в зависимости от положения ползунков. В смысл и подробности графика не будем вдаваться, основная проблема в том, что после нескольких минут работы - график и программа в целом начинает тормозить, помимо этого идет сильный жор оперативной памяти.

Не понимаю в чем проблема, слышал, что библиотека pyqtgraph позволяет строить до миллиона динамически изменяющихся точек без лагов и тормозов. С другой стороны, в программе есть 3-и списка, которые так же динамически изменяются (увеличиваются, см. скрин). Эти списки в цикле программы "пережевываются" и выходит 4-ый список, который мы как раз строим на графике.

Возможно моя проблема из-за того, что списки постоянно растут и через какое-то время начинают занимать очень много памяти? В общем не понятно, хочется осознать в чем проблема и найти пути решения.

Первая страница кода

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(938, 514)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Ignored, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(MainWindow.sizePolicy().hasHeightForWidth())
        MainWindow.setSizePolicy(sizePolicy)
        MainWindow.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout_2.setObjectName("verticalLayout_2")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Maximum)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.frame.sizePolicy().hasHeightForWidth())
        self.frame.setSizePolicy(sizePolicy)
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.frame)
        self.verticalLayout.setObjectName("verticalLayout")
        self.label = QtWidgets.QLabel(self.frame)
        self.label.setEnabled(True)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Maximum)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.label.sizePolicy().hasHeightForWidth())
        self.label.setSizePolicy(sizePolicy)
        font = QtGui.QFont()
        font.setFamily("HouschkaRoundedAlt 9")
        font.setPointSize(14)
        font.setBold(False)
        font.setItalic(False)
        font.setWeight(50)
        self.label.setFont(font)
        self.label.setContextMenuPolicy(QtCore.Qt.DefaultContextMenu)
        self.label.setLayoutDirection(QtCore.Qt.RightToLeft)
        self.label.setAutoFillBackground(False)
        self.label.setTextFormat(QtCore.Qt.AutoText)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")
        self.verticalLayout.addWidget(self.label)
        self.lineEdit_6 = QtWidgets.QLineEdit(self.frame)
        self.lineEdit_6.setObjectName("lineEdit_6")
        self.verticalLayout.addWidget(self.lineEdit_6)
        self.lineEdit_4 = QtWidgets.QLineEdit(self.frame)
        self.lineEdit_4.setObjectName("lineEdit_4")
        self.verticalLayout.addWidget(self.lineEdit_4)
        self.label_2 = QtWidgets.QLabel(self.frame)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Maximum)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.label_2.sizePolicy().hasHeightForWidth())
        self.label_2.setSizePolicy(sizePolicy)
        font = QtGui.QFont()
        font.setFamily("HouschkaRoundedAlt")
        font.setPointSize(12)
        self.label_2.setFont(font)
        self.label_2.setTextFormat(QtCore.Qt.PlainText)
        self.label_2.setAlignment(QtCore.Qt.AlignCenter)
        self.label_2.setObjectName("label_2")
        self.verticalLayout.addWidget(self.label_2)
        self.comboBox = QtWidgets.QComboBox(self.frame)
        font = QtGui.QFont()
        font.setFamily("HouschkaRoundedAlt 9")
        font.setPointSize(12)
        self.comboBox.setFont(font)
        self.comboBox.setContextMenuPolicy(QtCore.Qt.PreventContextMenu)
        self.comboBox.setSizeAdjustPolicy(QtWidgets.QComboBox.AdjustToMinimumContentsLengthWithIcon)
        self.comboBox.setObjectName("comboBox")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.verticalLayout.addWidget(self.comboBox)
        self.pushButton = QtWidgets.QPushButton(self.frame)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Ignored, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.pushButton.sizePolicy().hasHeightForWidth())
        self.pushButton.setSizePolicy(sizePolicy)
        font = QtGui.QFont()
        font.setFamily("HouschkaRoundedAlt 9")
        font.setPointSize(12)
        font.setBold(False)
        font.setItalic(False)
        font.setWeight(50)
        self.pushButton.setFont(font)
        self.pushButton.setObjectName("pushButton")
        self.verticalLayout.addWidget(self.pushButton)
        self.verticalLayout_2.addWidget(self.frame)
        MainWindow.setCentralWidget(self.centralwidget)
        self.action123 = QtWidgets.QAction(MainWindow)
        self.action123.setObjectName("action123")

        self.retranslateUi(MainWindow)
        self.pushButton.clicked.connect(self.lineEdit_6.clear)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "ЛАБОРАТОРНАЯ РАБОТА №1"))
        self.label_2.setText(_translate("MainWindow", "Выберите номер варианта по списку"))
        self.comboBox.setItemText(0, _translate("MainWindow", "1"))
        self.comboBox.setItemText(1, _translate("MainWindow", "2"))
        self.comboBox.setItemText(2, _translate("MainWindow", "3"))
        self.comboBox.setItemText(3, _translate("MainWindow", "4"))
        self.comboBox.setItemText(4, _translate("MainWindow", "5"))
        self.comboBox.setItemText(5, _translate("MainWindow", "6"))
        self.comboBox.setItemText(6, _translate("MainWindow", "7"))
        self.comboBox.setItemText(7, _translate("MainWindow", "8"))
        self.comboBox.setItemText(8, _translate("MainWindow", "9"))
        self.comboBox.setItemText(9, _translate("MainWindow", "10"))
        self.comboBox.setItemText(10, _translate("MainWindow", "11"))
        self.comboBox.setItemText(11, _translate("MainWindow", "12"))
        self.comboBox.setItemText(12, _translate("MainWindow", "13"))
        self.comboBox.setItemText(13, _translate("MainWindow", "14"))
        self.comboBox.setItemText(14, _translate("MainWindow", "15"))
        self.comboBox.setItemText(15, _translate("MainWindow", "16"))
        self.comboBox.setItemText(16, _translate("MainWindow", "17"))
        self.comboBox.setItemText(17, _translate("MainWindow", "18"))
        self.comboBox.setItemText(18, _translate("MainWindow", "19"))
        self.comboBox.setItemText(19, _translate("MainWindow", "20"))
        self.comboBox.setItemText(20, _translate("MainWindow", "21"))
        self.comboBox.setItemText(21, _translate("MainWindow", "22"))
        self.comboBox.setItemText(22, _translate("MainWindow", "23"))
        self.comboBox.setItemText(23, _translate("MainWindow", "24"))
        self.comboBox.setItemText(24, _translate("MainWindow", "25"))
        self.comboBox.setItemText(25, _translate("MainWindow", "26"))
        self.comboBox.setItemText(26, _translate("MainWindow", "27"))
        self.comboBox.setItemText(27, _translate("MainWindow", "28"))
        self.comboBox.setItemText(28, _translate("MainWindow", "29"))
        self.comboBox.setItemText(29, _translate("MainWindow", "30"))
        self.comboBox.setItemText(30, _translate("MainWindow", "31"))
        self.comboBox.setItemText(31, _translate("MainWindow", "32"))
        self.comboBox.setItemText(32, _translate("MainWindow", "33"))
        self.comboBox.setItemText(33, _translate("MainWindow", "34"))
        self.comboBox.setItemText(34, _translate("MainWindow", "35"))
        self.pushButton.setText(_translate("MainWindow", "Далее"))
        self.action123.setText(_translate("MainWindow", "123"))

Вторая страница кода

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(968, 710)
        self.horizontalLayout_6 = QtWidgets.QHBoxLayout(Form)
        self.horizontalLayout_6.setObjectName("horizontalLayout_6")
        self.frame = QtWidgets.QFrame(Form)
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.frame)
        self.verticalLayout.setObjectName("verticalLayout")
        self.horizontalLayout_7 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_7.setObjectName("horizontalLayout_7")
        self.label_4 = QtWidgets.QLabel(self.frame)
        font = QtGui.QFont()
        font.setFamily("HouschkaRoundedAlt 9")
        font.setPointSize(12)
        self.label_4.setFont(font)
        self.label_4.setAlignment(QtCore.Qt.AlignCenter)
        self.label_4.setObjectName("label_4")
        self.horizontalLayout_7.addWidget(self.label_4)
        self.verticalLayout.addLayout(self.horizontalLayout_7)
        self.textEdit = QtWidgets.QTextEdit(self.frame)
        self.textEdit.setObjectName("textEdit")
        self.verticalLayout.addWidget(self.textEdit)
        self.label = QtWidgets.QLabel(self.frame)
        font = QtGui.QFont()
        font.setFamily("HouschkaRoundedAlt 9")
        font.setPointSize(12)
        self.label.setFont(font)
        self.label.setTextFormat(QtCore.Qt.AutoText)
        self.label.setScaledContents(False)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setWordWrap(True)
        self.label.setOpenExternalLinks(False)
        self.label.setObjectName("label")
        self.verticalLayout.addWidget(self.label)
        self.horizontalLayout_4 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_4.setObjectName("horizontalLayout_4")
        self.label_2 = QtWidgets.QLabel(self.frame)
        font = QtGui.QFont()
        font.setFamily("HouschkaRoundedAlt 9")
        font.setPointSize(10)
        self.label_2.setFont(font)
        self.label_2.setAlignment(QtCore.Qt.AlignCenter)
        self.label_2.setObjectName("label_2")
        self.horizontalLayout_4.addWidget(self.label_2)
        self.label_3 = QtWidgets.QLabel(self.frame)
        font = QtGui.QFont()
        font.setFamily("HouschkaRoundedAlt 9")
        font.setPointSize(10)
        self.label_3.setFont(font)
        self.label_3.setAlignment(QtCore.Qt.AlignCenter)
        self.label_3.setObjectName("label_3")
        self.horizontalLayout_4.addWidget(self.label_3)
        self.verticalLayout.addLayout(self.horizontalLayout_4)
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.lcdNumber_4 = QtWidgets.QLCDNumber(self.frame)
        self.lcdNumber_4.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.lcdNumber_4.setFrameShadow(QtWidgets.QFrame.Raised)
        self.lcdNumber_4.setLineWidth(0)
        self.lcdNumber_4.setMidLineWidth(1)
        self.lcdNumber_4.setDigitCount(3)
        self.lcdNumber_4.setSegmentStyle(QtWidgets.QLCDNumber.Flat)
        self.lcdNumber_4.setObjectName("lcdNumber_4")
        self.horizontalLayout_2.addWidget(self.lcdNumber_4)
        self.lcdNumber_3 = QtWidgets.QLCDNumber(self.frame)
        self.lcdNumber_3.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.lcdNumber_3.setDigitCount(3)
        self.lcdNumber_3.setSegmentStyle(QtWidgets.QLCDNumber.Flat)
        self.lcdNumber_3.setObjectName("lcdNumber_3")
        self.horizontalLayout_2.addWidget(self.lcdNumber_3)
        self.verticalLayout.addLayout(self.horizontalLayout_2)
        self.horizontalLayout_3 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_3.setObjectName("horizontalLayout_3")
        self.lcdNumber_2 = QtWidgets.QLCDNumber(self.frame)
        self.lcdNumber_2.setFrameShape(QtWidgets.QFrame.NoFrame)
        self.lcdNumber_2.setDigitCount(3)
        self.lcdNumber_2.setSegmentStyle(QtWidgets.QLCDNumber.Flat)
        self.lcdNumber_2.setObjectName("lcdNumber_2")
        self.horizontalLayout_3.addWidget(self.lcdNumber_2)
        self.lcdNumber = QtWidgets.QLCDNumber(self.frame)
        font = QtGui.QFont()
        font.setPointSize(8)
        font.setBold(False)
        font.setItalic(False)
        font.setWeight(50)
        self.lcdNumber.setFont(font)
        self.lcdNumber.setAutoFillBackground(False)
        self.lcdNumber.setFrameShape(QtWidgets.QFrame.NoFrame)
        self.lcdNumber.setFrameShadow(QtWidgets.QFrame.Raised)
        self.lcdNumber.setSmallDecimalPoint(False)
        self.lcdNumber.setDigitCount(3)
        self.lcdNumber.setSegmentStyle(QtWidgets.QLCDNumber.Flat)
        self.lcdNumber.setObjectName("lcdNumber")
        self.horizontalLayout_3.addWidget(self.lcdNumber)
        self.verticalLayout.addLayout(self.horizontalLayout_3)
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.verticalSlider_2 = QtWidgets.QSlider(self.frame)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Expanding)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.verticalSlider_2.sizePolicy().hasHeightForWidth())
        self.verticalSlider_2.setSizePolicy(sizePolicy)
        self.verticalSlider_2.setMaximum(100)
        self.verticalSlider_2.setOrientation(QtCore.Qt.Vertical)
        self.verticalSlider_2.setObjectName("verticalSlider_2")
        self.horizontalLayout.addWidget(self.verticalSlider_2)
        self.verticalSlider = QtWidgets.QSlider(self.frame)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Expanding)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.verticalSlider.sizePolicy().hasHeightForWidth())
        self.verticalSlider.setSizePolicy(sizePolicy)
        self.verticalSlider.setFocusPolicy(QtCore.Qt.WheelFocus)
        self.verticalSlider.setMaximum(100)
        self.verticalSlider.setTracking(True)
        self.verticalSlider.setOrientation(QtCore.Qt.Vertical)
        self.verticalSlider.setInvertedAppearance(False)
        self.verticalSlider.setInvertedControls(False)
        self.verticalSlider.setTickPosition(QtWidgets.QSlider.NoTicks)
        self.verticalSlider.setTickInterval(0)
        self.verticalSlider.setObjectName("verticalSlider")
        self.horizontalLayout.addWidget(self.verticalSlider)
        self.verticalLayout.addLayout(self.horizontalLayout)
        self.horizontalLayout_5 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_5.setObjectName("horizontalLayout_5")
        self.pushButton_2 = QtWidgets.QPushButton(self.frame)
        self.pushButton_2.setObjectName("pushButton_2")
        self.horizontalLayout_5.addWidget(self.pushButton_2)
        self.pushButton = QtWidgets.QPushButton(self.frame)
        self.pushButton.setObjectName("pushButton")
        self.horizontalLayout_5.addWidget(self.pushButton)
        self.verticalLayout.addLayout(self.horizontalLayout_5)
        self.horizontalLayout_6.addWidget(self.frame)
        self.GraphWidget = PlotWidget(Form)
        self.GraphWidget.setObjectName("GraphWidget")
        self.horizontalLayout_6.addWidget(self.GraphWidget)

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

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.label_4.setText(_translate("Form", "TextLabel"))
        self.label.setText(_translate("Form", "Текущее значение степени открытия клапана, %"))
        self.label_2.setText(_translate("Form", "Расход топлива"))
        self.label_3.setText(_translate("Form", "Расход пит. воды"))
        self.pushButton_2.setText(_translate("Form", "PushButton"))
        self.pushButton.setText(_translate("Form", "PushButton"))

from pyqtgraph import PlotWidget

Основной код

from PyQt5 import QtWidgets, QtGui, QtCore
from first_try import Ui_MainWindow
from second_try import Ui_Form
import pyqtgraph as pg
from pyqtgraph import *
import sys
from control.matlab import *
import numpy as np

# Передаточная функция по каналу T-D (Температура - расход пит.воды)
num_D = [-1]
den_D = [10, 5, 1,]
delay_D = pade(3,10)
W_D= tf(num_D, den_D)*tf(delay_D[0],delay_D[1])

# Передаточная функция по каналу T-B (Температура - расход топлива)
num_B = [1]
den_B = [5, 2.5, 1]
delay_B = pade(5,10)
W_B= tf(num_B, den_B)*tf(delay_B[0],delay_B[1])

class Widget(QtWidgets.QWidget,Ui_Form):
    def __init__(self,number,parent):
        super(Widget, self).__init__(parent) # Позволяет использовать виджеты родителя
        self.setupUi(self)

        self.parent = parent
        self.number = number

        self.pushButton.setText('Внести возмущение')
        self.pushButton.setStyleSheet("background-color: rgb(0, 255, 127); font: 12pt \"HouschkaRoundedAlt 9\";")
        self.pushButton_2.setText('Внести возмущение')
        self.pushButton_2.setStyleSheet("background-color: rgb(0, 255, 127); font: 12pt \"HouschkaRoundedAlt 9\";")

        self.pushButton.clicked.connect(self.accept)
        self.pushButton_2.clicked.connect(self.accept_2)

        self.verticalSlider.setValue(60)
        self.verticalSlider.valueChanged.connect(self.show_digit)
        self.verticalSlider_2.setValue(60)
        self.verticalSlider_2.valueChanged.connect(self.show_digit_2)

        self.lcdNumber.display(self.verticalSlider_2.value())
        self.lcdNumber_2.display(self.verticalSlider_2.value())
        self.lcdNumber_3.display(self.verticalSlider.value())
        self.lcdNumber_4.display(self.verticalSlider.value())

        self.lcdNumber_3.setStyleSheet("background-color: rgb(0, 255, 127,25);")
        self.lcdNumber_4.setStyleSheet("background-color: rgb(0, 255, 127,25);")

        self.timer = QtCore.QTimer()
        self.timer.timeout.connect(self.showTime)
        self.timer.start(1000) # Частота обновления графика, мс

        # Настройки графика
        self.GraphWidget.setBackground((0, 255, 127,25))
        self.pen_1 = pg.mkPen(color=(255, 0, 0), width=2)
        self.pen_2 = pg.mkPen(color=(0, 255, 0), width=2)
        self.pen_3 = pg.mkPen(color=(0, 0, 255), width=2)
        styles = {'color': 'r', 'font-size': '15px'}
        self.GraphWidget.setLabel('left', 'Температура (°C)', **styles)
        self.GraphWidget.setLabel('bottom', 'Время (сек)', **styles)
        self.name = 'Температура в точке 1'
        self.GraphWidget.addLegend()
        self.GraphWidget.showGrid(x=True, y=True)

        self.t = np.array([])  # Время переходных процессов
        self.U_B = np.array([])  # Входное возмужение в виде изменения расхода топлива
        self.U_D = np.array([])  # Входное возмужение в виде изменения расхода пит.воды

        self.T_nominal = 0.5

    def accept(self):
        self.lcdNumber_3.display(self.verticalSlider.value())

    def accept_2(self):
        self.lcdNumber_4.display(self.verticalSlider_2.value())

    def show_digit(self):
        self.lcdNumber.display(self.verticalSlider.value())

    def show_digit_2(self):
        self.lcdNumber_2.display(self.verticalSlider_2.value())

    def showTime(self):
        self.U_D = np.append(self.U_D,self.lcdNumber_3.value()/50)
        self.U_B = np.append(self.U_B, self.lcdNumber_4.value()/50)
        if len(self.t)==0:
            self.t = np.append(self.t, 0)
        else:
            self.t = np.append(self.t, self.t[-1]+ 1)
        if len(self.t) >= 2:
            # Система имеет тип MISO: два входа - один выход.
            self.Y = lsim(W_B, self.U_B, self.t)[0] + lsim(W_D, self.U_D, self.t)[0]
            self.GraphWidget.plot(self.t[-2:],self.Y[-2:],pen=self.pen_1)
            self.label_4.setText(str(round(self.Y[-1:][0],2))+' °C')
            if self.Y[-1:] >= self.T_nominal:
                alpha = round(abs(self.Y[-1:][0])*255/(5*self.T_nominal))
                self.label_4.setStyleSheet("background-color: rgb(255, 0, 0,{});".format(alpha))
            elif self.Y[-1:] <= self.T_nominal*0.5:
                alpha = round(abs(self.Y[-1:][0]) * 255 / (4 * self.T_nominal))
                self.label_4.setStyleSheet("background-color: rgb(0, 0, 255,{});".format(alpha))
            else:
                self.label_4.setStyleSheet("background-color: rgb(240, 240, 240);")
        self.textEdit.setText(str(self.t))
        self.textEdit.append(str(self.U_D))
        self.textEdit.append(str(self.U_B))

class Start_Window(QtWidgets.QMainWindow,Ui_MainWindow):
    def __init__(self):
        super(Start_Window, self).__init__()
        self.setupUi(self)

        self.setWindowIcon(QtGui.QIcon('pythonlogo.png'))

        self.lineEdit_6.setStyleSheet("font: 12pt \"HouschkaRoundedAlt 9\";")
        self.lineEdit_6.setPlaceholderText('Введите группу: ТФ-ХХ-ХХ')
        self.lineEdit_6.setMaxLength(9)

        self.lineEdit_4.setPlaceholderText('Введите ФИО:')
        self.lineEdit_4.setStyleSheet("font: 12pt \"HouschkaRoundedAlt 9\";")

        self.comboBox.setStyleSheet("background-color: rgb(170, 170, 255);")

        self.comboBox.hide()
        self.label.hide()
        self.label_2.hide()
        self.lineEdit_4.hide()
        self.lineEdit_6.hide()

        self.pushButton.setStyleSheet("background-color: rgb(0, 255, 127);")
        self.pushButton.clicked.connect(self.hide_widget)

    def hide_widget(self):
        self.frame.hide()
        self.widget = (Widget(self.comboBox.currentText(),self))
        self.verticalLayout_2.addWidget(self.widget)


app = QtWidgets.QApplication([])
application = Start_Window()
application.show()
app.setStyle('Fusion')
sys.exit(app.exec())

self.t, self.U_B, self.U_D - те 3-и входных списка и self.Y - выходной список, который отображаем на графике