利率计算器，由haloged出品。

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from tkinter import *


class daikuanCalc(Frame):
    def __init__(self, parent=None):
        Frame.__init__(self, parent)
        self.pack()

        self.yearsVar = StringVar()  # 贷款年限
        self.amountVar = StringVar()  # 贷款金额
        self.rateVar = StringVar()  # 贷款利率
        self.total1Var = StringVar()  # 总还款额
        self.totalInterest1Var = StringVar()  # 总利息额
        self.monthRepay = StringVar()  # 月均还款

        Label(self, text="").grid(row=0, column=0, columnspan=6)
        Label(self, text="还款方式", font=('楷体', 15), height=2).grid(row=1, column=0, columnspan=3, rowspan=2)
        Label(self, text=":", font=('楷体', 15)).grid(row=1, column=3, rowspan=2)
        Label(self, text="贷款年限", font=('楷体', 15), height=2).grid(row=3, column=0, columnspan=3, rowspan=2)
        Label(self, text="(年):", font=('楷体', 15)).grid(row=3, column=3, rowspan=2)
        Label(self, text="贷款金额", font=('楷体', 15), height=2).grid(row=5, column=0, columnspan=3, rowspan=2)
        Label(self, text="(万元):", font=('楷体', 15)).grid(row=5, column=3, rowspan=2)
        Label(self, text="贷款利率", font=('楷体', 15), height=2).grid(row=7, column=0, columnspan=3, rowspan=2)
        Label(self, text="(%):", font=('楷体', 15)).grid(row=7, column=3, rowspan=2)
        Label(self, text="月均还款", font=('楷体', 15)).grid(row=11, column=0, columnspan=3, rowspan=2)
        Label(self, text="(元):", font=('楷体', 15), height=2).grid(row=11, column=3, rowspan=2)
        Label(self, text="利息总额", font=('楷体', 15)).grid(row=13, column=0, columnspan=3, rowspan=2)
        Label(self, text="(元):", font=('楷体', 15), height=2).grid(row=13, column=3, rowspan=2)
        Label(self, text="还款总额", font=('楷体', 15)).grid(row=15, column=0, columnspan=3, rowspan=2)
        Label(self, text="(元):", font=('楷体', 15), height=2).grid(row=15, column=3, rowspan=2)

        Entry(self, textvariable=self.yearsVar).grid(row=3, column=4, columnspan=5, rowspan=2)
        Entry(self, textvariable=self.amountVar).grid(row=5, column=4, columnspan=5, rowspan=2)
        Entry(self, textvariable=self.rateVar).grid(row=7, column=4, columnspan=5, rowspan=2)
        Entry(self, textvariable=self.monthRepay).grid(row=11, column=4, columnspan=5, rowspan=2)
        Entry(self, textvariable=self.totalInterest1Var).grid(row=13, column=4, columnspan=5, rowspan=2)
        Entry(self, textvariable=self.total1Var).grid(row=15, column=4, columnspan=5, rowspan=2)

        val = IntVar()  # 获取单选按钮的值
        val.set(0)

        r0 = Radiobutton(self, text='等额本息', font=('楷体', 15), variable=val, value=0, height=2)
        r0.grid(row=1, column=4, columnspan=3)
        r1 = Radiobutton(self, text='等额本金', font=('楷体', 15), variable=val, value=1, height=2)
        r1.grid(row=1, column=7, columnspan=3)

        def cmd():
        if val.get() == 0:
        # 获取输入的参数

        years = eval(self.yearsVar.get())  # 贷款年限
        amount = eval(self.amountVar.get())  # 贷款本金
        rate = eval(self.rateVar.get()) / 100 / 12  # 将年化利率转为月利率，单位为1

        # 计算每月还款
        monthRepayment = (amount * rate * ((1 + rate) ** (years * 12))) / ((1.0 + rate) ** (years * 12) - 1.0)

        # 显示计算结果
        total = monthRepayment * 12 * years  # 总还款金额
        self.total1Var.set(format(total, ".3f"))
        self.monthRepay.set(format(monthRepayment, '.3f'))

        totalInterest = total - amount  # 总利息
        self.totalInterest1Var.set(format(totalInterest, '.3f'))

else:

        # 获取输入的参数
        years = eval(self.yearsVar.get())  # 贷款年限
        amount = eval(self.amountVar.get())  # 贷款本金
        rate = eval(self.rateVar.get()) / 100 / 12  # 将年化利率转为月利率，单位为1
        month_amount = amount / (years * 12)

        # 储存月均还款
        monthRepayment = []
        for i in range(1, (years * 12) + 1):
        monthpayment = month_amount + (amount - (i - 1) * month_amount) * rate
        monthRepayment.append(monthpayment)

        # 显示结果
        total = sum(monthRepayment)
        self.total1Var.set(format(total, ".3f"))
        self.monthRepay.set(format(total / (years * 12), '.3f'))

        totalInterest = total - amount
        self.totalInterest1Var.set(format(totalInterest, '.3f'))

        def clear():  # 重新计算时清空
        self.yearsVar.set('')
        self.amountVar.set('')
        self.rateVar.set('')
        self.total1Var.set('')
        self.totalInterest1Var.set('')
        self.monthRepay.set('')

        Button(self, text='计 算', font=('楷体', 15), width='10', command=cmd).grid(row=9, column=3, rowspan=2)
        Button(self, text='重新计算', font=('楷体', 15), width='10', command=clear).grid(row=9, column=5, columnspan=3,
        rowspan=2)


        if __name__ == '__main__':
        app = Tk()
        app.title('贷款计算器')
        app.resizable(0, 0)
        apps = daikuanCalc(app)
        app.resizable(0, 0)
        app.mainloop()

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