为什么第一个代码运行而第二个代码在定义后没有运行？

编程问答 2022-05-02

问题描述

第一个代码完全正常。

  • 第一个代码

     from tkinter import *
 from tkinter import ttk


 win=Tk()  
 add=StringVar()
 sub=StringVar()
 pro=StringVar()

 def Find():
     add.set(float(ent00.get())+float(ent01.get()))
     sub.set(float(ent00.get())-float(ent01.get()))
     pro.set(float(ent00.get())*float(ent01.get()))

 ent00=Entry(win,width=15)
 ent00.grid(row=4,column=1,padx=10,pady=10,sticky='w')
 ent01=Entry(win,width=15)
 ent01.grid(row=5,sticky='w')

 lbl8=Label(win,text="Add",bg="crimson",fg="white",font=("times new roman",15,"bold")).grid(row=6,column=0,padx=20,sticky='w')
 ent8=Entry(win,textvariable=add,width=15,state='readonly')
 ent8.grid(row=6,sticky='w')

 lbl15=Label(win,text="Subtract","bold")).grid(row=7,sticky='w')
 ent15=Entry(win,textvariable=sub,state='readonly')
 ent15.grid(row=7,sticky='w')

 lbl9=Label(win,text="Product","bold")).grid(row=8,sticky='w')
 ent9=Entry(win,textvariable=pro,state='readonly')
 ent9.grid(row=8,sticky='w')

 btn = Button(win,text = 'Calculate',command=Find,bd = '5',height=2)
 btn.grid(row=11,pady=10)

 win.geometry("1400x700+250+250")
 win.mainloop()

但是当我定义它时，即使它成为一个函数（如下面的代码所示），它不起作用。它甚至没有显示任何错误。我不明白这个问题的原因。

  • 第二个代码：

     from tkinter import *
 from tkinter import ttk

 win=Tk()  

 def code():
     win=Tk()  
     add=StringVar()
     sub=StringVar()
     pro=StringVar()

     def Find():
         add.set(float(ent00.get())+float(ent01.get()))
         sub.set(float(ent00.get())-float(ent01.get()))
         pro.set(float(ent00.get())*float(ent01.get()))

     ent00=Entry(win,width=15)
     ent00.grid(row=4,sticky='w')
     ent01=Entry(win,width=15)
     ent01.grid(row=5,sticky='w')

     lbl8=Label(win,sticky='w')
     ent8=Entry(win,state='readonly')
     ent8.grid(row=6,sticky='w')

     lbl15=Label(win,sticky='w')
     ent15=Entry(win,state='readonly')
     ent15.grid(row=7,sticky='w')

     lbl9=Label(win,sticky='w')
     ent9=Entry(win,state='readonly')
     ent9.grid(row=8,sticky='w')

     btn = Button(win,height=2)
     btn.grid(row=11,pady=10)

     win.geometry("1400x700+250+250")
     win.mainloop()

 btn1 = Button(win,text = 'OPEN CODE',command=code,width=20,height=2)
 btn1.grid(row=11,pady=10)
 win.geometry("1400x700+250+250")
 win.mainloop()

我是否有任何错误导致其无法正常工作？ ______________________

解决方法

您正在重新定义 win，然后对其执行操作，这似乎不太合适。如果你想清除屏幕并放置新的小部件，我会这样做：

from tkinter import *
from tkinter import ttk

win=Tk()  

def code():
    btn1.destroy()
    add=StringVar()
    sub=StringVar()
    pro=StringVar()

    def Find():
        add.set(float(ent00.get())+float(ent01.get()))
        sub.set(float(ent00.get())-float(ent01.get()))
        pro.set(float(ent00.get())*float(ent01.get()))

    ent00=Entry(win,width=15)
    ent00.grid(row=4,column=1,padx=10,pady=10,sticky='w')
    ent01=Entry(win,width=15)
    ent01.grid(row=5,sticky='w')

    lbl8=Label(win,text="Add",bg="crimson",fg="white",font=("times new roman",15,"bold")).grid(row=6,column=0,padx=20,sticky='w')
    ent8=Entry(win,textvariable=add,width=15,state='readonly')
    ent8.grid(row=6,sticky='w')

    lbl15=Label(win,text="Subtract","bold")).grid(row=7,sticky='w')
    ent15=Entry(win,textvariable=sub,state='readonly')
    ent15.grid(row=7,sticky='w')

    lbl9=Label(win,text="Product","bold")).grid(row=8,sticky='w')
    ent9=Entry(win,textvariable=pro,state='readonly')
    ent9.grid(row=8,sticky='w')

    btn = Button(win,text = 'Calculate',command=Find,bd = '5',height=2)
    btn.grid(row=11,pady=10)


btn1 = Button(win,text = 'OPEN CODE',command=code,width=20,height=2)
btn1.grid(row=11,pady=10)
win.geometry("1400x700+250+250")
win.mainloop()

我刚刚删除了 win 函数中修改 code 的三行，并添加了 btn1.destroy()，它从窗口中删除了我们想要停止显示的按钮。

functionfunctionfunctionpythontktktkintertkinter-entry