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Re: Python GUI questions

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On 3/19/2013 10:16 PM, Ranting Rick wrote:
> import tkinter as tk
> from tkinter.constants import LEFT
>
> def cbButton(self):
>      print('I should do something here!')
>
> root = tk.Tk()
> root.title("Window")
> w=tk.Label(root, text="Enter a string")
> w.pack(side=LEFT)
> e1 = tk.Entry(root, bd=5)
> e1.pack(side=LEFT)
> b=tk.Button(root, text="Count", command=cbButton)
> b.pack(padx=5, pady=5)
> root.mainloop()

when I run this, and click the button, I get
Exception in Tkinter callback
Traceback (most recent call last):
   File "C:\Programs\Python33\lib\tkinter\__init__.py", line 1442, in 
__call__
     return self.func(*args)
TypeError: cbButton() missing 1 required positional argument: 'self'

when I remove 'self' from cbButton, I get the expected
I should do something here!

When I enter something in the Entry box and hit return, nothing happens. 
I presume that is because the example is not complete.

-- 
Terry Jan Reedy

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Thread

Python GUI  questions maiden129 <sengokubasarafever@gmail.com> - 2013-03-19 12:01 -0700
  Re: Python GUI questions Chris Angelico <rosuav@gmail.com> - 2013-03-20 08:39 +1100
    Re: Python GUI questions maiden129 <sengokubasarafever@gmail.com> - 2013-03-19 15:50 -0700
    Re: Python GUI questions maiden129 <sengokubasarafever@gmail.com> - 2013-03-19 15:50 -0700
  Re: Python GUI  questions Rick Johnson <rantingrickjohnson@gmail.com> - 2013-03-19 17:57 -0700
    Re: Python GUI  questions maiden129 <sengokubasarafever@gmail.com> - 2013-03-19 18:25 -0700
      Re: Python GUI questions Ranting Rick <rantingrickjohnson@gmail.com> - 2013-03-19 19:16 -0700
        Re: Python GUI questions maiden129 <sengokubasarafever@gmail.com> - 2013-03-19 19:36 -0700
          Re: Python GUI questions Rick Johnson <rantingrickjohnson@gmail.com> - 2013-03-19 20:06 -0700
        Re: Python GUI questions Terry Reedy <tjreedy@udel.edu> - 2013-03-19 23:21 -0400
          Re: Python GUI questions Rick Johnson <rantingrickjohnson@gmail.com> - 2013-03-20 10:37 -0700
      Re: Python GUI questions Jason Swails <jason.swails@gmail.com> - 2013-03-19 22:14 -0400
  Re: Python GUI  questions Jan Riechers <janpeterr@freenet.de> - 2013-03-31 16:33 +0300

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