Nested frames in tkinter - list

Question

Good Day,
Using tkinter, Python 3.5
I am attempting to create nested frames using for loops and lists to generate the frame names.
This works for the first level of frames within a frame, however the next level fails.
For example, this code works:
from tkinter import *
from tkinter import ttk
frameLevel1List = ['Frame1', 'Frame2', 'Frame3', 'Frame4']
frameLevel2List = ['FrameA', 'FrameB', 'FrameC', 'FrameD']
class myUI:
def __init__(self):
#create main window & frames
self.main_window = Tk()
self.main_window.title("frame2 UI V001 ")
self.main_window.configure(background='gray')
w=750
h=500
x=100
y=100
self.main_window.geometry("%dx%d+%d+%d" % (w, h, x, y))
self.userlabel = Label(self.main_window, bg='gray', fg='white', text = "user Label")
self.userlabel.pack(side="top")
self.levellabel = Label(self.main_window, bg='gray', fg='white', text = "level Label")
self.levellabel.pack(side="top")
#create bottom frame
bottomFrame = Frame(self.main_window, bg='white', height=500, width=800)
bottomFrame.pack(side=BOTTOM)
#create frames from first list
for frame in frameLevel1List:
self.frame=Frame(bottomFrame, width=800, height = 100, bg = 'green', highlightbackground="black", highlightcolor="black", highlightthickness="1")
self.frame.pack(side="top")
self.framelabel = Label(self.frame, bg='blue', fg='white', text = frame)
self.framelabel.place(x=10, y=10)
mainloop()
UI=myUI()
However, when I add a second for loop to add the second list of frames within each of the first frames, I get an error. The following code fails
from tkinter import *
from tkinter import ttk
frameLevel1List = ['Frame1', 'Frame2', 'Frame3', 'Frame4']
frameLevel2List = ['FrameA', 'FrameB', 'FrameC', 'FrameD']
class myUI:
def __init__(self):
#create main window & frames
self.main_window = Tk()
self.main_window.title("frame2 UI V001 ")
self.main_window.configure(background='gray')
w=750
h=500
x=100
y=100
self.main_window.geometry("%dx%d+%d+%d" % (w, h, x, y))
self.userlabel = Label(self.main_window, bg='gray', fg='white', text = "user Label")
self.userlabel.pack(side="top")
self.levellabel = Label(self.main_window, bg='gray', fg='white', text = "level Label")
self.levellabel.pack(side="top")
#create bottom frame
bottomFrame = Frame(self.main_window, bg='white', height=500, width=800)
bottomFrame.pack(side=BOTTOM)
#create frames from first list
for frame in frameLevel1List:
self.frame=Frame(bottomFrame, width=800, height = 100, bg = 'green', highlightbackground="black", highlightcolor="black", highlightthickness="1")
self.frame.pack(side="top")
self.framelabel = Label(self.frame, bg='blue', fg='white', text = frame)
self.framelabel.place(x=10, y=10)
#create frames from second list
for frame2 in frameLevel2List:
self.frame2=Frame(frame, width=800, height = 50, bg = 'yellow')
self.frame2.pack(side="top")
self.frame2label = Label(self.frame2, bg='blue', fg='white', text = frame2)
self.frame2label.place(x=10, y=10)
mainloop()
UI=myUI()
Here is the error message:
Traceback (most recent call last):
File "C:\Users\Nicholas Boughen\Desktop\py\rubrics\nestedFramesTest.py", line 43, in <module>
UI=myUI()
File "C:\Users\Nicholas Boughen\Desktop\py\rubrics\nestedFramesTest.py", line 36, in __init__
self.frame2=Frame(frame, width=800, height = 50, bg = 'yellow')
File "C:\Users\Nicholas Boughen\AppData\Local\Programs\Python\Python35\lib\tkinter\__init__.py", line 2584, in __init__
Widget.__init__(self, master, 'frame', cnf, {}, extra)
File "C:\Users\Nicholas Boughen\AppData\Local\Programs\Python\Python35\lib\tkinter\__init__.py", line 2132, in __init__
BaseWidget._setup(self, master, cnf)
File "C:\Users\Nicholas Boughen\AppData\Local\Programs\Python\Python35\lib\tkinter\__init__.py", line 2110, in _setup
self.tk = master.tk
AttributeError: 'str' object has no attribute 'tk'
Anything that could help me understand what I have done wrong and create nested frames with for loops would be most appreciated.
Perhaps there's a completely different way of procedurally creating nested frames that would be better? What I'm trying to do is to generate the frame names from a list and change the interface as the list changes. So if more or fewer items are in the list, there will be more or fewer frames in the interface. The list will be edited from a different interface.
lor

Answer 1

After many more hours of researching other people who had similar issues, and #jasonharper comment, I have discovered that I need to save(append) the frame ID into a list as it is created, to ensure each widget remains unique.
Here is the code that does what I want it to do:
from tkinter import *
import functools
class practice:
def __init__(self,root):
self.frame_list = []
for w in range(5):
frame = Frame(root, width=800, height = 100, bg = 'green', highlightbackground="black", highlightcolor="black", highlightthickness="1")
frame.pack(side="top")
self.frame_list.append(frame)
for w in range(5):
frame = Frame(root, width=400, height = 50, bg = 'blue', highlightbackground="black", highlightcolor="black", highlightthickness="1")
frame.pack(side="top")
self.frame_list.append(frame)
for w in range(5):
frame = Frame(root, width=200, height = 25, bg = 'yellow', highlightbackground="black", highlightcolor="black", highlightthickness="1")
frame.pack(side="top")
self.frame_list.append(frame)
print('button list is', self.frame_list)
root = Tk()
root.title("frame2 UI V001 ")
root.configure(background='gray')
w=750
h=500
x=100
y=100
root.geometry("%dx%d+%d+%d" % (w, h, x, y))
Thank you, I will attempt to post questions with greater clarity in future.
lor