输入字段未使用用户定义的模块进行更新

Question

I have a master program in python3 that calls sub-programs via modules. This works fine, except that my modules don't update the Entry fields when changes are made elsewhere within the module. The Module shows that values are put in the correct place, but the window isn't updated. Here is an example of the master program:-

# test - master

from tkinter import *

root=Tk()
root.title("Test for the update problem")

import changeEntryfield

changeEntryfield.fun() # call to function inside module

root.mainloop()

# end of master program

And here is the module that is called (stored as "changeEntryfield.py"):-

def fun():

    import tkinter 


    win=tkinter.Tk() # start a window

    g3=tkinter.StringVar()

    g3.set("text")

    a="something"

    field=tkinter.Entry(win,width=10,textvariable=g3)
    field.grid(column=1,row=0,sticky='W',padx=5,pady=5)

    grpslab3=tkinter.Label(win,text="The Field is: ")
    grpslab3.grid(column=0,row=0,sticky='W',padx=5,pady=5)

    # now do changes to field value

    g3.set(a)
    print ("1. In Entry, field = ",field['textvariable'])

    field['textvariable']=g3.get()
    print ("2. In Entry, field = ",field['textvariable'])

    field.config(textvariable=g3.get())
    print ("3. In Entry, field = ",field['textvariable'])

    field['textvariable']=a
    print ("4. In Entry, field = ",field['textvariable'])

    win.mainloop()

# end of module

Any suggestions?

Answer 1

Tkinter isn't designed to work this way. A complete program should only ever have a single instance of Tk at one time. You should create instances of Toplevel in your sub-programs.