[Tkinter] Create a set of checkbutton widgets and refer to every one of them individually?

[Mariano]

I am a teacher. Using Tkinter and Openpyxl I need to code a graphical user interface so I could click on a student's name “linked” with a checkbutton square and display his/her marks (saved on a “.xlsx” file) whenever his/her checkbutton is active. How can I create a set of widgets/checkbuttons that I can refer individually later on? My code fails.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

# -*- coding: utf-8 -*-     from tkinter import *     import openpyxl       wb = openpyxl.load_workbook('marks.xlsx', data_only=True)     sheet = wb.active       names_and_rows = {}       for i in range(2, sheet.max_row + 1):             name = sheet.cell(row=i, column=1).value             names_and_rows[name] = i       root = Tk()     root.title("Student's marks")       students_names = Frame(root, bd=1, relief="solid")     students_names.pack(side="left")       student_marks = Frame(root, bd=1, relief="solid")     student_marks.pack(side="right")       message = Label(student_marks, text="You still haven't checked on a         ny student's name")     message.pack()         def get_marks(v):         marks = ""         for i in range(2, sheet.max_column + 1):             information = str(sheet.cell(row=1, column=i).value) + ": "                 + str(sheet.cell(row=v, column=i).value) + "\n"             marks = marks + information         if (v.get() == 1):             message.config(text=marks)         else:             message.config(text="You still haven't checked on any                 student's name")         list_of_widgets = []       for k, v in names_and_rows.items():         square = Checkbutton(students_names, variable=v, onvalue=1,             offvalue=0, text=k, command=lambda: get_marks(v))         list_of_widgets.append(square)         square.pack()       root.mainloop()

[woooee]

so I could click on a student's name “linked” with a checkbutton square and display his/her marks

This example that I found on the web long ago, shows how to associate a button with a name in a second list. You could also use a dictionary.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

import tkinter as tk     # Python3   def cb_checked():     # remove text from label     label['text'] = ''     for ctr, int_var in enumerate(cb_intvar):         if int_var.get():     ## IntVar not zero==checked             label['text'] += '%s is checked' % cb_list[ctr] + '\n'   root = tk.Tk()   cb_list = [ 'apple', 'orange', 'banana', 'pear', 'apricot' ]   # list of IntVar for each button cb_intvar = [] for this_row, text in enumerate(cb_list):     cb_intvar.append(tk.IntVar())     tk.Checkbutton(root, text=text,                             variable=cb_intvar[-1],                      command=cb_checked).grid(row=this_row, column=0, sticky='w')   label = tk.Label(root, width=20) label.grid(row=20, column=0, sticky='w')   # you can preset check buttons (1=checked, 0=unchecked) cb_intvar[3].set(1) # show what is initially checked cb_checked()   root.mainloop()