Alan Gauld schrieb am Donnerstag, 8. April 2021 um 02:05:01 UTC+2:
> On 07/04/2021 09:35, Mohsen Owzar wrote:
>
> > The problem is that I can't use the variable "val" from Tab2 in Tab 1,
> > # Filename: Tab1.py
> > from tkinter import *
> >
> > def gen_t1(frame):
> > f = LabelFrame(frame, text='f', bg='lightgreen')
> > f.pack(expand=True, fill='both')
> >
> > b1 = Button(f, text='B1').pack()
> >
> > ## if val > 5:
> > # Filename: Tab2.py
> > from tkinter import *
> >
> > def gen_t2(frame):
> > def getValue(event):
> > val = ent.get()
> > print(val)
> Note that val is a local variable within a nested function.
> It only exists while the nested function is executing.
> As soon as the function ends val is thrown away.
>
> If you want the value of the entry you need to store it
> in a variable that is visible after the function exits
> (by returning it perhaps? or setting a global - ugly)
>
> But you still have the problem of making that visible
> to Tab1. You could import tab2 into tab1 and use Tab2.varName
>
> But this is why GUIs are often(usually?) built as a class
> because you can store all the state variables within
> the instance and access them from all the methods.
>
> You can do it with functions but you usually wind up
> with way too many globals to be comfortable.
> > from Tab1 import gen_t1
> > from Tab2 import gen_t2
> ...
> > def on_tab_change(event):
> > global firstTime1, firstTime2
> >
> > tab = event.widget.tab('current','text')
> > if tab == 'Tab 1':
> > print('Tab 1')
> > if firstTime1 == 1:
> > gen_t1(tab1)
> > firstTime1 = 0
> Probably nicer to use boolean values for
> firstTime1 and firstTime2, ie True and False
> rather than their numeric equivalents.
>
> HTH
> --
> Alan G
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
> http://www.amazon.com/author/alan_gauld
> Follow my photo-blog on Flickr at:
> http://www.flickr.com/photos/alangauldphotos
Hi Alan G,
Thanks a lot for giving me this solution.
Because I'm a newbie in Python and write programs since a couple of months, and
I'm not so familiar with classes, would be very nice to give me a code, how I
have to change my code into a class form.
I tried without a class and I ran into problems that the defined frame and
entry are not defined.
Best regards
Mohsen
--
https://mail.python.org/mailman/listinfo/python-list
