[Tutor] how to change the command "string" on a tkinter Button?

[Chris Roy-Smith]

On 01/07/18 02:17, Alan Gauld via Tutor wrote:
> On 30/06/18 03:55, Chris Roy-Smith wrote:
>
>> I am trying to change the command of a tkinter Button in my program.
>> Eventually I want to be able to do this to many buttons.
> Since I'm not 100% sure if you mean the command or the label or both
> here is a simple example that does both...
>
> ############################################
> import tkinter as tk
>
> def cmd1(): print('This is command 1')
>
> def cmd2(): print('This is number 2')
>
> def swapCmd():
>      c = b1['command']
>      # kluge to get the function name from Tcl id
>      if str(c).endswith("cmd1"):
>          b1['command'] = cmd2
>      else:
>          b1['command'] = cmd1
>
> def swapText():
>      t = b1['text']
>      if t == "Cool":
>          b1['text'] = "Hot"
>      else:
>          b1['text'] = "Cool"
>
> # make GUI
> top = tk.Tk()
> win = tk.Frame(top)
> win.pack()
> b1 = tk.Button(win,text="Cool", command=cmd1)
> b1.pack()
> b2 = tk.Button(win, text="Swap text", command=swapText)
> b2.pack()
> b3 = tk.Button(win, text="Swap cmd", command=swapCmd)
> b3.pack()
>
> top.mainloop()
> ###########################################
>
>
Thank you Alan, you have covered what I think I wanted to achieve. For 
me, programming is a continual learning experience, unfortunately I seem 
to forget nearly as much as I learn, Python is the first language I have 
attempted since macro assembler for CP/M. Python seems to be another world.

It appears that I broke the code I started experimenting with, to try  
changing the command, and that may have added to my confusion.

I'll play with your example to try an understand what is going on.

Regards, Chris Roy-Smith