from tkinter import *
class pencere:
def __init__ (self, master):
cerceve=Frame(master);
cerceve.pack();
self.dugme=Button(cerceve,text="Devam",font="Arial 10 bold",fg="blue",command=self.islem)
self.dugme.pack();
def islem (self):
sonuc=31+69
self.yazi=Label(cerceve,text=sonuc,font="Arial 12 bold")
self.yazi.pack();
root=Tk()
pro=pencere(root)
root.mainloop()
bu kodu yazıyorum fakat bu hatay veriyor
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python30\lib\tkinter\__init__.py", line 1409, in __call__
return self.func(*args)
File "C:\Python30\test.py", line 13, in islem
self.yazi=Label(cerceve,text=sonuc,font="Arial 12 bold")
NameError: global name 'cerceve' is not defined


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