[Tutor] methods within a class

[Alan Colburn]

Hi all--

Can you help me distinguish between these two simple programs? They differ
only in terms of statements I highlighted via commenting.  [If indentation
doesn't look right on your screen, just ignore...]

This one works fine:

****************************************************************************
*****
from Tkinter import *
root=Tk()

class Program(Frame):
 def __init__(self):
  Frame.__init__(self)
  self.pack()
  self.entry1=Entry(self)
  self.entry1.bind('<Key-Return>', self.gettext)
  self.entry1.pack(side=TOP, fill=X)
#   self.printText()

 def gettext(self, event):
  global text
  text=self.entry1.get()
  self.printText()

 def printText(self):
  print "The value of the variable text is: ", text

if __name__=="__main__":
 app=Program()
 app.mainloop()
****************************************************************************
*****

On the other hand, this one does not:

****************************************************************************
*****
from Tkinter import *
root=Tk()

class Program(Frame):
 def __init__(self):
  Frame.__init__(self)
  self.pack()
  self.entry1=Entry(self)
  self.entry1.bind('<Key-Return>', self.gettext)
  self.entry1.pack(side=TOP, fill=X)
  self.printText()

 def gettext(self, event):
  global text
  text=self.entry1.get()
 #  self.printText()

 def printText(self):
  print "The value of the variable text is: ", text

if __name__=="__main__":
 app=Program()
 app.mainloop()

I know the answer will be relatively simple; I just need a little lesson on
methods and classes I guess.

Thanks, as always, for your help. -- Alan C.

p.s. Scot (in Berlin) -- you may recognize parts of this small program from
a response you were kind enough to send me last summer :-)