<>1. Design interface

As shown below , utilize QTdesigner Design interface :

Then the designed interface is converted into .py file :

guess_number.py
# -*- coding: utf-8 -*- # Form implementation generated from reading ui file
'guess_number.ui' # # Created by: PyQt5 UI code generator 5.15.2 # # WARNING:
Any manual changes made to this file will be lost when pyuic5 is # run again.
Do not edit this file unless you know what you are doing. from PyQt5 import
QtCore, QtGui, QtWidgets class Ui_MainWindow(object): def setupUi(self,
MainWindow): MainWindow.setObjectName("MainWindow") MainWindow.resize(580, 328)
icon= QtGui.QIcon() icon.addPixmap(QtGui.QPixmap("../../../Icon/Comment.svg"),
QtGui.QIcon.Normal, QtGui.QIcon.Off) icon.addPixmap(QtGui.QPixmap(
"../../../Icon/Comment.svg"), QtGui.QIcon.Normal, QtGui.QIcon.On) icon.addPixmap
(QtGui.QPixmap("../../../Icon/Comment.svg"), QtGui.QIcon.Disabled, QtGui.QIcon.
Off) icon.addPixmap(QtGui.QPixmap("../../../Icon/Comment.svg"), QtGui.QIcon.
Disabled, QtGui.QIcon.On) icon.addPixmap(QtGui.QPixmap(
"../../../Icon/Comment.svg"), QtGui.QIcon.Active, QtGui.QIcon.Off) icon.
addPixmap(QtGui.QPixmap("../../../Icon/Comment.svg"), QtGui.QIcon.Active, QtGui.
QIcon.On) icon.addPixmap(QtGui.QPixmap("../../../Icon/Comment.svg"), QtGui.QIcon
.Selected, QtGui.QIcon.Off) icon.addPixmap(QtGui.QPixmap(
"../../../Icon/Comment.svg"), QtGui.QIcon.Selected, QtGui.QIcon.On) MainWindow.
setWindowIcon(icon) self.centralwidget = QtWidgets.QWidget(MainWindow) self.
centralwidget.setObjectName("centralwidget") self.gridLayout_4 = QtWidgets.
QGridLayout(self.centralwidget) self.gridLayout_4.setObjectName("gridLayout_4")
spacerItem= QtWidgets.QSpacerItem(20, 50, QtWidgets.QSizePolicy.Minimum,
QtWidgets.QSizePolicy.Expanding) self.gridLayout_4.addItem(spacerItem, 0, 1, 1,
1) spacerItem1 = QtWidgets.QSpacerItem(181, 20, QtWidgets.QSizePolicy.Expanding,
QtWidgets.QSizePolicy.Minimum) self.gridLayout_4.addItem(spacerItem1, 1, 3, 1,
1) spacerItem2 = QtWidgets.QSpacerItem(180, 20, QtWidgets.QSizePolicy.Expanding,
QtWidgets.QSizePolicy.Minimum) self.gridLayout_4.addItem(spacerItem2, 1, 0, 1,
1) self.gridLayout_3 = QtWidgets.QGridLayout() self.gridLayout_3.setObjectName(
"gridLayout_3") spacerItem3 = QtWidgets.QSpacerItem(17, 37, QtWidgets.
QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding) self.gridLayout_3.addItem(
spacerItem3, 0, 2, 1, 1) self.gridLayout_2 = QtWidgets.QGridLayout() self.
gridLayout_2.setObjectName("gridLayout_2") self.button = QtWidgets.QPushButton(
self.centralwidget) self.button.setObjectName("button") self.gridLayout_2.
addWidget(self.button, 2, 1, 1, 1) self.inputnumber = QtWidgets.QLineEdit(self.
centralwidget) self.inputnumber.setObjectName("inputnumber") self.gridLayout_2.
addWidget(self.inputnumber, 0, 0, 1, 3) spacerItem4 = QtWidgets.QSpacerItem(40,
20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum) self.
gridLayout_2.addItem(spacerItem4, 2, 2, 1, 1) spacerItem5 = QtWidgets.
QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.
Minimum) self.gridLayout_2.addItem(spacerItem5, 2, 0, 1, 1) spacerItem6 =
QtWidgets.QSpacerItem(20, 40, QtWidgets.QSizePolicy.Minimum, QtWidgets.
QSizePolicy.Expanding) self.gridLayout_2.addItem(spacerItem6, 1, 1, 1, 1) self.
gridLayout_3.addLayout(self.gridLayout_2, 1, 1, 2, 2) spacerItem7 = QtWidgets.
QSpacerItem(37, 17, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.
Minimum) self.gridLayout_3.addItem(spacerItem7, 1, 3, 1, 1) spacerItem8 =
QtWidgets.QSpacerItem(37, 17, QtWidgets.QSizePolicy.Expanding, QtWidgets.
QSizePolicy.Minimum) self.gridLayout_3.addItem(spacerItem8, 1, 0, 1, 1)
spacerItem9= QtWidgets.QSpacerItem(17, 37, QtWidgets.QSizePolicy.Minimum,
QtWidgets.QSizePolicy.Expanding) self.gridLayout_3.addItem(spacerItem9, 3, 1, 1,
1) self.gridLayout_4.addLayout(self.gridLayout_3, 1, 1, 1, 2) spacerItem10 =
QtWidgets.QSpacerItem(20, 49, QtWidgets.QSizePolicy.Minimum, QtWidgets.
QSizePolicy.Expanding) self.gridLayout_4.addItem(spacerItem10, 2, 2, 1, 1)
MainWindow.setCentralWidget(self.centralwidget) self.menubar = QtWidgets.
QMenuBar(MainWindow) self.menubar.setGeometry(QtCore.QRect(0, 0, 580, 28)) 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", " Guessing game ")) self.button.setText(_translate(
"MainWindow", " I guess ")) self.inputnumber.setText(_translate("MainWindow", " Enter the number here "
))
<>2. Yes ui The function of the interface is realized

If you use the .py The files are not very convenient to use , Generated after modifying the interface .py The file will be directly overwritten , Here, I use a new class to directly get the interface designed before, so as to separate the algorithm from the interface program , Code first .

main.py
import sys import guess_number from PyQt5.QtWidgets import QApplication,
QMainWindow, QMessageBox, QWidget from random import randint class guess_ui(
QMainWindow): def __init__(self): # get ui from guess_number super().__init__()
self.num = randint(1, 100) self.MainWindow = QMainWindow() self.InitUI() def
InitUI(self): ui = guess_number.Ui_MainWindow() ui.setupUi(self) button = self.
findChild(QWidget, 'button') button.clicked.connect(self.show_message) self.show
() # self.MainWindow.show() def show_message(self): inputnumber = self.findChild
(QWidget, 'inputnumber') guessnumber = int(inputnumber.text()) print(guessnumber
) if guessnumber > self.num: QMessageBox.about(self, 'see the result', 'bigger!'
) inputnumber.setFocus() elif guessnumber < self.num: QMessageBox.about(self,
'see the result', 'smaller!') inputnumber.setFocus() else: QMessageBox.about(
self, 'see the result', 'true') self.num = randint(1, 100) inputnumber.clear()
inputnumber.setFocus() def closeEvent(self, event): reply = QMessageBox.question
(self, 'confirm', 'Are you sure?', QMessageBox.Yes | QMessageBox.No) if reply ==
QMessageBox.Yes: event.accept() else: event.ignore() if __name__ == '__main__':
app= QApplication(sys.argv) guess = guess_ui() sys.exit(app.exec_())
<>3. Analysis of part of the code
class guess_ui(QMainWindow):
Direct this class from QMainWindow It can be inherited to achieve the right QT Event rewriting , The event recurrence code is as follows :
def closeEvent(self, event): reply = QMessageBox.question(self, 'confirm',
'Are you sure?', QMessageBox.Yes | QMessageBox.No) if reply == QMessageBox.Yes:
event.accept() else: event.ignore()
In the interface file, the definition of button is direct add In , Therefore, to define the function of a control, you must first obtain the control , The code is shown below :
button = self.findChild(QWidget, 'button')

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