Tkinter error: bad window path name when deleting frames dynamically - python-3.x

Question

Im trying to recreate a little version of trello in tkinter. Right now im stuck I have a problem when I want to delete frames in a different order. For example: I click on the button and a new frame is generated if I delete that everything works. If I create 3 frames I have to remove them in the same order as I have created them. So I think my problems lies in the pop function but I dont know how to access them manually. When i change the pop function to (1) then I have to delete the second creation first instead of the first.
Here is the code:
from tkinter import *
class Window:
def __init__(self, width, height):
self.root = Tk()
self.width = width
self.height = height
self.root.geometry(width + "x" + height)
class Frames:
def __init__(self):
self.l = Frame(window.root, bg="red", height=300, width=300, relief="sunken")
self.l.place(relwidth=0.3, relheight=0.3)
self.deleteB = Button(self.l, text="X", command=self.delete_frame, bg="blue")
self.deleteB.place(rely=0, relx=0.92)
self.addB = Button(self.l, text="Add", command=self.add_note, bg="blue")
self.addB.place(rely=0, relx=0.65)
def delete_frame(self):
self.l.pack()
self.l.pack_forget()
self.l.destroy()
frames.pop()
def add_note(self):
self.note_Label = Label(self.l, text="Clean the room")
self.note_Label.pack(padx=20, pady=10)
self.delete_Note = Button(self.note_Label, text="X", command=self.del_Note)
self.delete_Note.pack(padx=5, pady=5)
def del_Note(self):
self.note_Label.pack_forget()
self.note_Label.destroy()
class Note:
def __init__(self):
pass
class DragNDrop:
def __init__(self):
pass
def make_draggable(self, widget):
widget.bind("<Button-1>", self.on_drag_start)
widget.bind("<B1-Motion>", self.on_drag_motion)
def on_drag_start(self, event):
widget = event.widget
widget._drag_start_x = event.x
widget._drag_start_y = event.y
def on_drag_motion(self, event):
widget = event.widget
x = widget.winfo_x() - widget._drag_start_x + event.x
y = widget.winfo_y() - widget._drag_start_y + event.y
widget.place(x=x, y=y)
class Buttons:
def __init__(self):
self.button = Button(window.root, width=20, height=20, bg="blue", command=self.add_frames)
self.button.pack()
def add_frames(self):
frames.append(Frames())
print(frames)
window = Window("800", "600")
frames = []
drag = DragNDrop()
button = Buttons()
while True:
for i in frames:
drag.make_draggable(i.l)
window.root.update()
If someone has an Idea or workaround that would be nice to know.
Also I have another Idea instead of destroying them I could just hide them but in the end that makes the programm really slow at some point.
Here is the error: _tkinter.TclError: bad window path name ".!frame2"

Answer 1

Your code needs to remove the frame from the list. Instead, you're calling pop which always removes the last item. That causes you to lose the reference to the last window, and one of the references in frames now points to a window that has been deleted (which is the root cause of the error)
Instead, call remove:
def delete_frame(self):
self.l.destroy()
frames.remove(self)