how to delete a specific item in the list after a button is clicked in tkinter python - python-3.x

Question

Below is a small code where if you click add button a pop-up will appear where you write desired number. The number in the bottom represents the sum of all numbers you entered.
What I am trying to achieve is to update the sum_lbl and index_no as I delete any of the labels.
Code:
from tkinter import *
root = Tk()
root.geometry('400x400')
add_room_area_var= StringVar(None)
area_lst = []
index_no = 0
def destroy(widget):
widget.destroy()
def add_():
add_room_area = Toplevel(root)
add_room_area.title('Add Room area')
add_room_area.wm_minsize(200, 50)
add_room_area.resizable(False, False)
add_room_area.transient(root)
add_r_area_frame = LabelFrame(add_room_area, text=' Room area ', labelanchor=N)
add_r_area_frame.config(padx=3, pady=3)
add_r_area_frame.pack(fill=X, padx=10, pady=10)
add_r_area_entry = Entry(add_r_area_frame, textvariable=add_room_area_var)
add_r_area_entry.pack(fill=X)
add_r_area_entry.focus_set()
while True:
def ok_():
global index_no
name = add_room_area_var.get()
index_no += 1
entry_frame = Frame(root)
index_lbl = Label(entry_frame, text=index_no)
add_room_lbl = Label(entry_frame, text=name, width=12, bg='gray30', fg='white', pady=5)
close_button = Button(entry_frame, text='X', command=lambda:destroy(entry_frame))
entry_frame.pack(anchor=N, padx=1)
index_lbl.pack(side=LEFT, padx=3)
add_room_lbl.pack(fill=X, side=LEFT)
close_button.pack(side=RIGHT)
area_lst.append(int(name))
add_room_area.destroy()
area_sum = sum(area_lst)
sum_lbl.config(text=area_sum)
break
ok_button = Button(add_room_area, text='Ok', command=ok_)
ok_button.pack()
btn = Button(root, text='Add', command=add_)
btn.pack()
sum_lbl = Label(root, font=25)
sum_lbl.pack(side=BOTTOM, pady=15)
root.mainloop()
Output:
After deleting the 3rd and 4th label the output is:

Answer 1

I would suggest to change area_lst to dictionary using the frame as the key and the two labels as the value for each row.
Then update destroy() to use area_lst to update the total and indexes:
from tkinter import *
root = Tk()
root.geometry('400x400')
add_room_area_var= StringVar(None)
area_lst = {} # dictionary to hold labels of each row using frame as the key
def destroy(frame):
frame.destroy()
del area_lst[frame]
update_total()
# update index of remaining rows
for idx, (lbl, _) in enumerate(area_lst.values(), 1):
lbl['text'] = idx
# function to update the total label
def update_total():
area_sum = sum(int(room['text']) for _, room in area_lst.values())
sum_lbl.config(text=area_sum)
def add_():
add_room_area = Toplevel(root)
add_room_area.title('Add Room area')
add_room_area.wm_minsize(200, 50)
add_room_area.resizable(False, False)
add_room_area.transient(root)
add_r_area_frame = LabelFrame(add_room_area, text=' Room area ', labelanchor=N)
add_r_area_frame.config(padx=3, pady=3)
add_r_area_frame.pack(fill=X, padx=10, pady=10)
add_r_area_entry = Entry(add_r_area_frame, textvariable=add_room_area_var)
add_r_area_entry.pack(fill=X)
add_r_area_entry.focus_set()
def ok_():
name = add_room_area_var.get()
entry_frame = Frame(root)
index_lbl = Label(entry_frame, text=len(area_lst)+1)
add_room_lbl = Label(entry_frame, text=name, width=12, bg='gray30', fg='white', pady=5)
close_button = Button(entry_frame, text='X', command=lambda:destroy(entry_frame))
entry_frame.pack(anchor=N, padx=1)
index_lbl.pack(side=LEFT, padx=3)
add_room_lbl.pack(fill=X, side=LEFT)
close_button.pack(side=RIGHT)
# store current row to area_lst
area_lst[entry_frame] = (index_lbl, add_room_lbl)
add_room_area.destroy()
update_total()
ok_button = Button(add_room_area, text='Ok', command=ok_)
ok_button.pack()
btn = Button(root, text='Add', command=add_)
btn.pack()
sum_lbl = Label(root, font=25)
sum_lbl.pack(side=BOTTOM, pady=15)
root.mainloop()

Answer 2

You can allow buttons to call multiple commands, so for your 'close_button' button, I added two more commands: remove the name from 'area_lst' and update the 'sum_lbl' text with the new sum for 'area_lst'
Like this:
from tkinter import *
root = Tk()
root.geometry('400x400')
add_room_area_var= StringVar(None)
area_lst = []
index_no = 0
def destroy(widget):
widget.destroy()
def add_():
add_room_area = Toplevel(root)
add_room_area.title('Add Room area')
add_room_area.wm_minsize(200, 50)
add_room_area.resizable(False, False)
add_room_area.transient(root)
add_r_area_frame = LabelFrame(add_room_area, text=' Room area ', labelanchor=N)
add_r_area_frame.config(padx=3, pady=3)
add_r_area_frame.pack(fill=X, padx=10, pady=10)
add_r_area_entry = Entry(add_r_area_frame, textvariable=add_room_area_var)
add_r_area_entry.pack(fill=X)
add_r_area_entry.focus_set()
while True:
def ok_():
global index_no
name = add_room_area_var.get()
index_no += 1
entry_frame = Frame(root)
index_lbl = Label(entry_frame, text=index_no)
add_room_lbl = Label(entry_frame, text=name, width=12, bg='gray30', fg='white', pady=5)
close_button = Button(entry_frame, text='X', command=lambda:[destroy(entry_frame), area_lst.remove(int(name)), sum_lbl.config(text=sum(area_lst))])
entry_frame.pack(anchor=N, padx=1)
index_lbl.pack(side=LEFT, padx=3)
add_room_lbl.pack(fill=X, side=LEFT)
close_button.pack(side=RIGHT)
area_lst.append(int(name))
add_room_area.destroy()
area_sum = sum(area_lst)
sum_lbl.config(text=area_sum)
break
ok_button = Button(add_room_area, text='Ok', command=ok_)
ok_button.pack()
btn = Button(root, text='Add', command=add_)
btn.pack()
sum_lbl = Label(root, font=25)
sum_lbl.pack(side=BOTTOM, pady=15)
root.mainloop()