Duplicating A Tkinter Treeview

I'm trying to display a ttk treeview in another window. The only option, it seems, is to iterate through the original treeview and populate the new one accordingly. However I can't

Solution 1:

Without known the depth of the item you need to check if the item has children. If so you need the function to call itself in a loop. Here is a working exampel:

import tkinter as tk
from tkinter import ttk

root = tk.Tk()

maintree = ttk.Treeview(root)
maintree.pack()

first = maintree.insert("","end",text='first')
second= maintree.insert(first,"end",text='second')
third= maintree.insert(second,"end",text='third')
fourth= maintree.insert(third,"end",text='fourth')

st = maintree.insert("","end",text='1st')
nd= maintree.insert(st,"end",text='2nd')
rd= maintree.insert(nd,"end",text='3rd')
th= maintree.insert(rd,"end",text='4th')

top = tk.Toplevel(root)
subtree = ttk.Treeview(top)
subtree.pack()

def copy_item_tree(item,child):
    for child in maintree.get_children(child):
        item = subtree.insert(item,"end",
                              text=maintree.item(child)['text'])
        if maintree.get_children(child):
            copy_item_tree(item,child)
def copy_tree():
    for child in maintree.get_children():
        item = subtree.insert("","end",text=maintree.item(child)['text'])
        copy_item_tree(item,child)

button = tk.Button(root,text='Copy Tree', command=copy_tree)
button.pack(fill='x')
root.mainloop()