Untitled

from PyQt5 import QtCore, QtGui, QtWidgets
import sys


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(1082, 800)
        MainWindow.setStyleSheet("QPushButton {\n"
                                 "    background-color: white\n"
                                 "\n"
                                 "}")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(80, 390, 61, 51))
        self.pushButton_2.setStyleSheet("QPushButton {\n"
                                        "    background-color: blue\n"
                                        "}\n"
                                        "pushButton_2 {\n"
                                        "    background-color: white\n"
                                        "}\n"
                                        "")
        self.pushButton_2.setText("")
        self.pushButton_2.setObjectName("pushButton_2")
        self.pushButton_3 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_3.setGeometry(QtCore.QRect(80, 450, 61, 51))
        self.pushButton_3.setStyleSheet("QPushButton {\n"
                                        "    background-color: orange\n"
                                        "}")
        self.pushButton_3.setText("")
        self.pushButton_3.setAutoDefault(False)
        self.pushButton_3.setObjectName("pushButton_3")
        self.pushButton_4 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_4.setGeometry(QtCore.QRect(80, 510, 61, 51))
        self.pushButton_4.setStyleSheet("QPushButton {\n"
                                        "    background-color: green\n"
                                        "}")
        self.pushButton_4.setText("")
        self.pushButton_4.setObjectName("pushButton_4")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(30, 350, 181, 31))
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(60, 710, 93, 28))
        self.pushButton.setStyleSheet("QPushButton {\n"
                                      "    background-color: silver\n"
                                      "}\n"
                                      "")
        self.pushButton.setObjectName("pushButton")
        self.horizontalSlider = QtWidgets.QSlider(self.centralwidget)
        self.horizontalSlider.setGeometry(QtCore.QRect(20, 110, 160, 22))
        self.horizontalSlider.setMaximum(15)
        self.horizontalSlider.setProperty("value", 0)
        self.horizontalSlider.setSliderPosition(0)
        self.horizontalSlider.setOrientation(QtCore.Qt.Horizontal)
        self.horizontalSlider.setInvertedAppearance(False)
        self.horizontalSlider.setTickInterval(0)
        self.horizontalSlider.setObjectName("horizontalSlider")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(10, 80, 231, 16))
        self.label_2.setObjectName("label_2")
        self.label_3 = QtWidgets.QLabel(self.centralwidget)
        self.label_3.setGeometry(QtCore.QRect(10, 140, 55, 16))
        self.label_3.setObjectName("label_3")
        self.label_4 = QtWidgets.QLabel(self.centralwidget)
        self.label_4.setGeometry(QtCore.QRect(170, 140, 55, 16))
        self.label_4.setObjectName("label_4")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(50, 170, 113, 22))
        self.lineEdit.setObjectName("lineEdit")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 1082, 26))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

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

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "Choose the color to draw with:"))
        self.pushButton.setText(_translate("MainWindow", "Exit"))
        self.label_2.setText(_translate("MainWindow", "Enter thickness of pencil via scrollbar:"))
        self.label_3.setText(_translate("MainWindow", "1 px"))
        self.label_4.setText(_translate("MainWindow", "15 px"))


example = Ui_MainWindow()
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
example.setupUi(MainWindow)
MainWindow.show()

#существенный код только это, остльное - инициализация окна
col = ''

def bp():
    global col
    col = 're'

ui.pushButton_3.clicked.connect(bp)

if col == 're':
    print(1)
else:
print(0)