[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')
I was hoping eventually to generate the command form the results of a 
database query, not knowing  the exact command until run time. Perhaps 
what I was trying to achieve is too close to self modifying code, I was 
warned off this when I used to dabble in assembler. Does the same advice 
hold for python?
>
> 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
I never thought to try anything like this, I was thinking more along the 
lines for how to change the text of a Labe.l
> 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 again Alan,
While your solution works, it's not how I imagined in terms of approach. 
Eventually I wanted to change the command of a variable number of 
buttons with the actual command depending on the results of a database 
query. I am unable to see how I can manage this in your solution style ( 
predetermined commands) might be difficult to achieve ( with my limited 
programming skills ).  Your solution made me rethink what I was 
attempting to do, and found with a slightly modified database query, I 
didn't need to change the command at all. The rest of this bit of 
program I have already solved.
Now I just have to learn a lot more about classes, and objects.

again, thank you Alan.
Regards, Chris Roy-Smith