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.price_box = QtWidgets.QTextEdit(self.centralwidget)
        self.price_box.setGeometry(QtCore.QRect(300, 110, 291, 81))
        font = QtGui.QFont()
        font.setPointSize(35)
        self.price_box.setFont(font)
        self.price_box.setObjectName("price_box")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(70, 110, 121, 61))
        font = QtGui.QFont()
        font.setPointSize(20)
        font.setBold(True)
        font.setWeight(75)
        self.label.setFont(font)
        self.label.setObjectName("label")
        self.tax_rate = QtWidgets.QSpinBox(self.centralwidget)
        self.tax_rate.setGeometry(QtCore.QRect(300, 250, 291, 81))
        font = QtGui.QFont()
        font.setPointSize(40)
        self.tax_rate.setFont(font)
        self.tax_rate.setProperty("value", 20)
        self.tax_rate.setObjectName("tax_rate")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(70, 260, 151, 61))
        font = QtGui.QFont()
        font.setPointSize(20)
        font.setBold(True)
        font.setWeight(75)
        self.label_2.setFont(font)
        self.label_2.setObjectName("label_2")
        self.calc_tax_button = QtWidgets.QPushButton(self.centralwidget)
        self.calc_tax_button.setGeometry(QtCore.QRect(460, 430, 121, 71))
        self.calc_tax_button.setObjectName("calc_tax_button")
        self.calc_tax_button.clicked.connect(self.CalculateTax)
        self.results_window = QtWidgets.QTextEdit(self.centralwidget)
        self.results_window.setGeometry(QtCore.QRect(140, 430, 171, 51))
        self.results_window.setObjectName("results_window")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 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", "Price"))
        self.label_2.setText(_translate("MainWindow", "Tax Rate"))
        self.calc_tax_button.setText(_translate("MainWindow", "calc_tax"))

    def CalculateTax(self):
        price = int(self.price_box.toPlainText())
        tax = (self.tax_rate.value())
        total_price = price + ((tax / 100) * price)
        total_price_string = "The total price with tax is: " + str(total_price)
        self.results_window.setText(total_price_string)


if __name__=="__main__":
    import sys
    app=QtWidgets.QApplication(sys.argv)
    mainwindow=QtWidgets.QMainWindow()
    ui=Ui_MainWindow()
    ui.setupUi(mainwindow)
    mainwindow.show()
    sys.exit(app.exec_())

<pre><code>这是一个代码区块。</code></pre>

• Bird
• Magic

single asteriskssingle underscoresdouble asterisksdouble underscores

Use the printf() function.

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千里江陵一日还
两岸猿声啼不住
轻舟已过万重山

朝辞白帝彩云间
我再加一句话看看效果

这是一级标题

这是二级标题

这是三级标题

这是六级标题

这是一级标题

这是二级标题

这是一级引用

这是二级引用

这是三级引用

这是一条删除线