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第一次写此类代码，仅是个简单的框架，有待进一步丰富内容。源代码如下：

import tkinter as tkclass Win1Input(tk.Toplevel):    def __init__(self):        super().__init__()        self.title(u'凭证号录入')        self.geometry('240x150+266+483')        self.attributes("-toolwindow", 2)        self.resizable(False,False)        self.wm_attributes('-topmost',True)        self.protocol("WM_DELETE_WINDOW", self.cancel)        self.setup_UI()    def setup_UI(self):        global flagWin1        flagWin1=True        self.code1 = tk.StringVar()        self.code2 = tk.IntVar()        te1=tk.Entry(self, textvariable=self.code1, width=20)        te2=tk.Entry(self, textvariable=self.code2, width=20)        te1.place(x=70,y=5)        te2.place(x=70,y=35)        tl1=tk.Label(self, text=u'凭证号：', width=8, anchor=tk.E)        tl2=tk.Label(self, text=u'协议号：', width=8, anchor=tk.E)        tl1.place(x=5,y=5)        tl2.place(x=5,y=35)        tb1=tk.Button(self, text=u"确定", command=self.ok)        tb2=tk.Button(self, text=u"取消", command=self.cancel)        tb1.place(x=60,y=80)        tb2.place(x=150,y=80)        te1.focus()    def exit1(self):        global flagWin1        flagWin1=False        print('exitWin1')        self.destroy()    def ok(self):        self.Retcode = [self.code1.get(), self.code2.get()]        self.exit1()    def cancel(self):        self.Retcode = None        self.exit1()class Win2Print(tk.Toplevel):    def __init__(self):        super().__init__()        self.title(u'凭证打印')        self.geometry('400x300+266+483')        self.attributes("-toolwindow", 2)        self.resizable(False,False)        self.wm_attributes('-topmost',True)        self.protocol("WM_DELETE_WINDOW", self.cancel)        self.setup_UI()    def setup_UI(self):        global flagWin2        flagWin2=True        tcv=tk.Canvas(self, width=400, height=220, bg='white')        tcv.create_text((20, 80), text=u'凭证打印的内容，此处略', anchor=tk.W)        tcv.place(x=0,y=0)        tb1=tk.Button(self, text=u"打印", command=self.ok)        tb2=tk.Button(self, text=u"取消", command=self.cancel)        tb1.place(x=90,y=250)        tb2.place(x=200,y=250)    def exit2(self):        global flagWin2        flagWin2=False        print('exitWin2')        self.destroy()    def ok(self):        self.Retcode = "Print OK"        self.exit2()    def cancel(self):        self.Retcode = None        self.exit2()class AppMain(tk.Tk):    def __init__(self):        super().__init__()        global flagWin1,flagWin2        flagWin1=flagWin2=False        self.title(u'房贷记账小助手')        self.geometry('240x480+10+480')        self.resizable(False,False)        self.wm_attributes('-topmost',True)        self.code1 = 'T1234567'        self.code2 = 123456789        self.protocol("WM_DELETE_WINDOW", self.exitMainApp) #点击关闭按钮触发        self.setup_UI()    def setup_UI(self):        tl1=tk.Label(self, text=u'凭证号：', width=8, anchor=tk.E)        tl2=tk.Label(self, text=u'协议号：', width=8, anchor=tk.E)        tl1.place(x=5,y=5)        tl2.place(x=5,y=35)        self.tl3 = tk.Label(self, text=self.code1, width=21, anchor=tk.W)        self.tl4 = tk.Label(self, text=self.code2, width=21, anchor=tk.W)        self.tl3.place(x=70,y=5)        self.tl4.place(x=70,y=35)        tb1=tk.Button(self, text=u"录入", command=self.setup_config)        tb1.place(x=50,y=100)        tb2=tk.Button(self, text=u"打印", command=self.setup_config2)        tb2.place(x=120,y=100)    def setup_config(self):        global flagWin1,flagWin2        if flagWin1:            self.Input1.focus()            return        if flagWin2:            self.Print1.focus()            return        res = self.get_voucherNum()        if res is None: return        self.code1, self.code2 = res        self.tl3.config(text=self.code1)        self.tl4.config(text=self.code2)    def setup_config2(self):        global flagWin1,flagWin2        if flagWin1:            self.Input1.focus()            return        if flagWin2:            self.Print1.focus()            return        res = self.print_voucher()        if res is None: return    def get_voucherNum(self):        '''对应Win1Input窗口类'''        self.Input1 = Win1Input()        self.wait_window(self.Input1)        try:            return self.Input1.Retcode        except:            pass    def print_voucher(self):        '''对应Win2Print窗口类'''        print('print')        self.Print1 = Win2Print()        self.wait_window(self.Print1)        try:            return self.Print1.Retcode        except:            pass    def exitMainApp(self):        '''点击关闭按钮触发'''        print(flagWin1,flagWin2) #退出时子窗口Win1,Win2是否打开        if flagWin1 or flagWin2: return #判断子窗口是否关闭        print('exit(0)')        self.destroy()if __name__ == '__main__':    app = AppMain()    app.mainloop()

运行效果截图：（实际运行时，两子窗口不能共存的）