importsysfrom PyQt5.QtCore import *

from PyQt5.QtGui import *

from PyQt5.QtWidgets import *

classcalMoney(QDialog):def __init__(self,parent=None):

super().__init__(parent)

self.setWindowTitle('帅帅的利息计算器')#定义QLable时，在快捷键字母前加“&”符号；

#alt+P

PrincipalLabel = QLabel("&Principal:")

self.inpMoney=QDoubleSpinBox()

self.inpMoney.setPrefix("$") #设置前缀

self.inpMoney.setRange(0.01,100000000)

self.inpMoney.setValue(1000)

PrincipalLabel.setBuddy(self.inpMoney)

RateLabel= QLabel("&Rate:")

self.inpRate=QDoubleSpinBox()

self.inpRate.setSuffix("%") #设置后缀

self.inpRate.setValue(5)

RateLabel.setBuddy(self.inpRate)

YearsLabel= QLabel("&Years:")

self.inpYears=QComboBox()

ls=[]for i in range(1,11):if i==1:

year= str(i) + "year"

else:

year= str(i) + "years"ls.append(year)

self.inpYears.addItems(ls)

YearsLabel.setBuddy(self.inpYears)

AmountLabel= QLabel("&Amount")

self.oupAmount= QLabel("$ 1102.50")

AmountLabel.setBuddy(self.oupAmount)#网格布局

layout =QGridLayout()

layout.addWidget(PrincipalLabel, 0, 0)

layout.addWidget(self.inpMoney, 0,1)

layout.addWidget(RateLabel,1, 0)

layout.addWidget(self.inpRate,1, 1)

layout.addWidget(YearsLabel,2, 0)

layout.addWidget(self.inpYears,2, 1)

layout.addWidget(AmountLabel,3, 0)

layout.addWidget(self.oupAmount,3, 1)#信号与槽相连

self.inpMoney.valueChanged.connect(self.updateAmount)

self.inpRate.valueChanged.connect(self.updateAmount)

self.inpYears.currentIndexChanged.connect(self.updateAmount)

self.setLayout(layout)defupdateAmount(self):

principal=float(self.inpMoney.value())

rate=float(self.inpRate.value())

years=int(self.inpYears.currentIndex())

amount= principal * pow((1 + 0.01 * rate),(years+1))

self.oupAmount.setText("{0:.2f}".format(amount))passapp=QApplication(sys.argv)

form=calMoney()

form.show()

app.exec_()