Question

I want to create a list of checkboxes in Python with TkInter and try to select all checkboxes with a button.

from tkinter import *
def create_cbuts():
for i in cbuts_text:
    cbuts.append(Checkbutton(root, text = i).pack())

def select_all():
    for j in cbuts:
        j.select()

root = Tk()
cbuts_text = ['a','b','c','d']
cbuts = []
create_cbuts()
Button(root, text = 'all', command = select_all()).pack()
mainloop()

I fear that he does not fill the list cbuts:

cbuts.append(Checkbutton(root, text = i).pack())

Answer 1

Replace:

Button(root, text = 'all', command = select_all()).pack()

with:

Button(root, text='all', command=select_all).pack()

---

Checkbutton(root, text = i).pack() returns you None. So you are actually appending Nones to your list. What you need to do is: append the instance of Button not the value which .pack() returns (None)