如何使用 tkinter（python 3）在 for 循环中为组合框提供不同的变量名称

Question

I am a beginner and working on a program for my raspberry pi 3B + (in python 3). I would like to make a program to turn the GPIO pins on and off. I hereby try to use as little code as possible. However, the problem is that in the for loop that I made, the combobxes don't get their own name, so I can't read them. I like to give them the name combo+str(nr) but python doesn't want to do this. I would also like to link an action to each option. Does anyone know a solution for this?

Here is my code:

#imports--------------------------------------------------
from tkinter import *
from tkinter import ttk

#variabelen and defs--------------------------------------------------

here I want to place the definition (s) for the comboboxes. Again as short as possible.

#window setup--------------------------------------------------
root = Tk()
root.title("Raspberry Pi - GPIO")

#labels--------------------------------------------------
clm = 0
nr = 1
for a in range (4):
    clm = clm+3
    for b in range (10):
        name = "GPIO"+str(nr)
        nr = nr+1
        naam = Label(root, text = name)
        naam.grid(column = clm, row = b)

#comboboxes--------------------------------------------------
clm = 1
nr = 1
for a in range (4):
    clm = clm+3
    for b in range (10):
        nr = nr+1
        optie = ttk.Combobox(root, state="readonly", width = 5, values = ["ON","OFF"])
        optie.current(1)
        optie.grid(column = clm, row = b)

#white space--------------------------------------------------
clm = 2
for a in range (3):
    clm = clm+3
    for b in range (10):
        naam = Label(root, text = "          ")
        naam.grid(column = clm, row = b)

#window + mainloop--------------------------------------------------
root.resizable(0,0)
root.mainloop()

sorry if my english is not so good, normally i speak dutch. thank you in advance.

Answer 1

What you need are references to the objects you created, and it doesn't have to be names. You can use containers like list or dict to store them.

from tkinter import *
from tkinter import ttk

root = Tk()
root.title("Raspberry Pi - GPIO")
all_combos = {} #create an empty dictionary

for col in range(4):
    all_combos[col] = [] #create a list base on column index
    for row in range(1,11):
        Label(root,text=f"GPIO{col*10+row}").grid(row=row,column=col*2)
        c = ttk.Combobox(root, state="readonly", width = 5, values = ["ON","OFF"])
        c.current(1)
        c.grid(row=row,column=col*2+1)
        all_combos[col].append(c) #add each combobox to the column

root.resizable(0,0)
root.mainloop()

Now you get a dictonary all_combos which stores all your combobox objects. You can access any specific combobox by passing indexes, eg

print (all_combos[0][5].get())

#OFF