Python||Gui编程||tkinter库||银行贷款系统

仅供学习参考

import tkinter
from tkinter import *
from tkinter import messagebox
class MortgageCalculator:
    def __init__(self):
        win=tkinter.Tk()
        win.title('计算贷款金额')
        lblMoney=Label(win,text='贷款金额:')
        lblMoney.grid(row=0,column=0,padx=5,pady=5,sticky='e')
        self.vmoney=IntVar();self.vmoney.set(10000)
        entMoney=Entry(win,width=15,textvariable=self.vmoney)
        entMoney.grid(row=0,column=1,padx=5,pady=5,sticky='w')

        lblYearRate=Label(win,text='贷款年利率:')
        lblYearRate.grid(row=1,column=0,padx=5,pady=5,sticky='e')
        self.vyearRate=IntVar();self.vyearRate.set(6.5)
        entYearRate=Entry(win,width=15,textvariable=self.vyearRate)
        entYearRate.grid(row=1,column=1,padx=5,pady=5,sticky='w')

        lblYears=Label(win,text='还款年数:')
        lblYears.grid(row=2,column=0,padx=5,pady=5,sticky='e')
        self.vyears=IntVar();self.vyears.set(2)
        entYears=Entry(win,width=15,textvariable=self.vyears)
        entYears.grid(row=2,column=1,padx=5,pady=5,sticky='w')

        btn_calculate=Button(win,text='计算每月应还款金额',command=self.Calculate)
        btn_calculate.grid(row=3,column=0,pady=5,columnspan=2)#横框两列

        lbl_payment=Label(win,text='每月应还款金额:')
        lbl_payment.grid(row=4,column=0,padx=5,pady=5,sticky='e')
        self.vPayment=DoubleVar()
        entpayment=Entry(win,width=15,state='readonly',textvariable=self.vPayment)#设置为只读0
        entpayment.grid(row=4,column=1,padx=5,pady=5,sticky='w')

        win.mainloop()
    def Calculate(self):
        try:
            xMoney=float(self.vmoney.get())
            xYearRate=float(self.vyearRate.get())
            xYears=int(self.vyears.get())
            xMonths=xYears*12
            xMonthRate=xYearRate/12
            xSum=xMoney*((1+xMonthRate/100)**xMonths)/xMonths
            self.vPayment.set(round(xSum,2)) #保留两位小数
        except:
            messagebox.showerror(title='提示',message='输入错误，重新输入')
MortgageCalculator()