Python使用PyQt5实现计算平方或者立方

# -*- coding: utf-8 -*-
# 导入相关库
from PyQt5.QtWidgets import QApplication ,QMainWindow
import sys

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(280, 20, 371, 81))
        self.label.setStyleSheet("font: 28pt \"Agency FB\";")
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(290, 420, 241, 121))
        self.pushButton.setStyleSheet("font: 18pt \"Agency FB\";")
        self.pushButton.setObjectName("pushButton")
        self.textBrowser = QtWidgets.QTextBrowser(self.centralwidget)
        self.textBrowser.setGeometry(QtCore.QRect(210, 260, 421, 61))
        self.textBrowser.setStyleSheet("font: 26pt \"Agency FB\";")
        self.textBrowser.setObjectName("textBrowser")
        self.textEdit = QtWidgets.QTextEdit(self.centralwidget)
        self.textEdit.setGeometry(QtCore.QRect(210, 150, 421, 61))
        self.textEdit.setStyleSheet("font: 26pt \"Agency FB\";")
        self.textEdit.setObjectName("textEdit")
        self.checkBox = QtWidgets.QCheckBox(self.centralwidget)
        self.checkBox.setGeometry(QtCore.QRect(240, 350, 101, 31))
        self.checkBox.setObjectName("checkBox")
        self.checkBox_2 = QtWidgets.QCheckBox(self.centralwidget)
        self.checkBox_2.setGeometry(QtCore.QRect(410, 350, 101, 31))
        self.checkBox_2.setObjectName("checkBox_2")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 23))
        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", "不太万能的计算器"))
        self.pushButton.setText(_translate("MainWindow", "按钮"))
        self.checkBox.setText(_translate("MainWindow", "计算他的平方"))
        self.checkBox_2.setText(_translate("MainWindow", "计算他的立方"))



#当按钮被点击时时
def button_clicked():
    # 添加全局变量
    global input_false
    # 检查勾选哪个按钮
    check_1 = ui.checkBox.isChecked()
    check_2 = ui.checkBox_2.isChecked()
    num = ui.textEdit.toPlainText()
    # 检查输入的是否全为数字
    if num.isdigit():
        num = int(num)
        # 输入是否错误（后边用来提示）
        input_false = 0
    else:
        check_1 = False
        check_2 = False
        # 输入是否错误，后边提示用
        input_false =  1
    # 当两个被同时勾选时
    if check_1 and check_2:
        ui.textBrowser.setText("只能勾选一个")
    # 平方按钮被勾选时
    elif check_1:
        result = num ** 2
        result = str(result)
        ui.textBrowser.setText(result)
    # 立方按钮被勾选时
    elif check_2:
        result = num ** 3
        result = str(result)
        ui.textBrowser.setText(result)
    # 当输入框没有输入数字时
    elif input_false == 1:
        ui.textBrowser.setText("请输入数字")
   # 当两个都没有被勾选时
    else:
        ui.textBrowser.setText("请勾选计算平方或立方")


if __name__ == '__main__':
    app = QApplication(sys.argv)
    MainWindow = QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    # 讲按钮点击事件与函数关联起来
    ui.pushButton.clicked.connect(button_clicked)
    sys.exit(app.exec_())

此源码为直播时讲解的源码，我加了注释