Hi!
I've been working on this app last days, and can't get passed this problem:
I've created two windows, (one is created by a button click in the first
window), and from the other window I want to change some variables defined
in the first window.
I'm guessing either I haven't understood the whole parent thingy, or messed
up somewhere there.
The source code is:
(there's some translations and explanations below)
#!/usr/bin/python
# -*- coding: utf-8 -*-
from __future__ import division
import Tkinter
class enhetsomvandlare_tk(Tkinter.Tk):
def __init__(self,parent):
Tkinter.Tk.__init__(self,parent)
self.parent = parent
self.initialize()
def initialize(self):
self.grid()
self.LV = Tkinter.StringVar()
label = Tkinter.Label(self,textvariable=self.LV,
anchor="w",fg="white",bg="blue")
label.grid(column=0,row=0,columnspan=1,sticky='EW')
self.LV.set(u"Lbs to Kg")
global enhet
enhet = "lbstokg"
self.entryVariable1 = Tkinter.StringVar()
self.entry = Tkinter.Entry(self,textvariable=self.entryVariable1)
self.entry.grid(column=0,row=1,sticky='W')
self.entry.bind("<Return>", self.OnPressEnter)
self.entryVariable1.set(u"")
self.entryVariable2 = Tkinter.StringVar()
self.entry = Tkinter.Entry(self,textvariable=self.entryVariable2)
self.entry.grid(column=1,row=1,sticky='W')
self.entry.bind("<Return>", self.OnPressEnter)
self.entryVariable2.set(u"")
raknaknapp = Tkinter.Button(self,text=u"Räkna ut!",
command=self.Onraknaknapp1)
raknaknapp.grid(column=2,row=1)
Change_units = Tkinter.Button(self,text=u"Change Units",
command=self.OnChange_units)
Change_units.grid(column=1,row=2)
self.grid_columnconfigure(0,weight=1)
self.grid_columnconfigure(1,weight=1)
self.grid_columnconfigure(2,weight=1)
self.resizable(True,False)
self.update()
self.geometry(self.geometry())
def Onraknaknapp1(self):
if enhet == "lbstokg":
lbs = float(self.entryVariable1.get())
kg = lbs / 0.455
self.entryVariable2.set(kg)
elif enhet == "kgtolbs":
kg = float(self.entryVariable1.get())
lbs = kg * 0.455
self.entryVariable2.set(lbs)
def OnChange_units(self):
class Change_units_tk(Tkinter.Tk):
def __init__(self,parent):
Tkinter.Tk.__init__(self,parent)
self.parent = parent
self.initialize()
def initialize(self):
self.grid()
self.LV2 = Tkinter.StringVar()
label = Tkinter.Label(self,textvariable=self.LV2,
anchor="w",fg="white",bg="blue")
label.grid(column=0,row=0,columnspan=2,sticky='EW')
self.LV2.set(u"Choose Unit...")
kgtolbs = Tkinter.Button(self,text=u"Kg to lbs",
command=self.Onkgtolbs)
kgtolbs.grid(column=0,row=1)
lbstokg = Tkinter.Button(self,text=u"Lbs to kg",
command=self.Onlbstokg)
lbstokg.grid(column=1,row=1)
self.grid_columnconfigure(0,weight=1)
self.grid_columnconfigure(1,weight=1)
self.grid_columnconfigure(2,weight=1)
self.resizable(True,False)
self.update()
self.geometry(self.geometry())
def Onkgtolbs(self):
self.LV.set("Kg to lbs")
global enhet
enhet = "kgtolbs"
def Onlbstokg(self):
self.LV.set("Lbs to kg")
global enhet
enhet = "lbstokg"
if __name__ == "__main__":
app = Change_units_tk(enhetsomvandlare_tk)
app.title("What unit?")
def OnPressEnter(self,event):
self.LV.set( "Hej" )
if __name__ == "__main__":
app = enhetsomvandlare_tk(None)
app.title("Robert's Enhetsomvandlare")
app.mainloop()
(Some things are swedish, so I'll translate them to make this easier to
understand)
Legend for my code:
enhet = unit
LV = Labelvariable
raknaknapp = calculatebutton
Räkna ut = calculate
Now as soon as I get the crossover thing to work I'll start adding more
math, functions and other things to it to make it useful. But right now I
want to get rid of this error message:
Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 1413, in __call__
return self.func(*args)
File "/home/robert/Desktop/programmering/python/12 enhets
omvandlare/12.py", line 118, in OnChange_units
app = Change_units_tk(enhetsomvandlare_tk)
File "/home/robert/Desktop/programmering/python/12 enhets
omvandlare/12.py", line 78, in __init__
Tkinter.Tk.__init__(self,parent)
File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 1646, in __init__
self.tk = _tkinter.create(screenName, baseName, className, interactive,
wantobjects, useTk, sync, use)
TypeError: create() argument 1 must be string or None, not classobj
OR
when i have the line:
app = Change_units_tk(enhetsomvandlare_tk)
changed to:
app = Change_units_tk(None)
I will get the error message:
Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 1413, in __call__
return self.func(*args)
File "/home/robert/Desktop/programmering/python/12 enhets
omvandlare/12.py", line 107, in Onkgtolbs
self.LV.set("Kg to lbs")
File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 1725, in __getattr__
return getattr(self.tk, attr)
AttributeError: LV
Which is the one I really don't get...
Anyways, I've searched the net for some help, but couldn't find anything
really helpful. (I know I probably missed it, but this was easier... :P)
Help is appreciated, (I'm a first time poster).
Have a nice day! :)
/Robert
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