problem using tkinter treeview widget and page gui builder

Question

I am new to python and trying to build a GUI app using PAGE GUI builder I have a treeView widget on my page and here is my function in the support module:

def initTree():
    for i in w.prefTreeviewScTrv.get_children():
        w.prefTreeviewScTrv.delete(i)
    w.prefTreeviewScTrv["columns"]=("one","two","three")
    w.prefTreeviewScTrv.column("#0", width=270, minwidth=270, stretch=tk.NO)
    w.prefTreeviewScTrv.column("one", width=150, minwidth=150, stretch=tk.NO)
    w.prefTreeviewScTrv.column("two", width=400, minwidth=200)
    w.prefTreeviewScTrv.column("three", width=80, minwidth=50, stretch=tk.NO)
    w.prefTreeviewScTrv.heading("#0",text="Name",anchor=tk.W)
    w.prefTreeviewScTrv.heading("one", text="Date modified",anchor=tk.W)
    w.prefTreeviewScTrv.heading("two", text="Type",anchor=tk.W)
    w.prefTreeviewScTrv.heading("three", text="Size",anchor=tk.W)
    # Level 1
    w.prefTreeviewScTrv.insert("", 1, "", text="first_file.txt", values=("22-Jun-16 11:25","first file","0.5 KB"))
    folder1=w.prefTreeviewScTrv.insert("", 2, "", text="Folder 1", values=("23-Jun-17 11:05","File folder",""))
    w.prefTreeviewScTrv.insert("", 3, "", text="text_file.txt", values=("23-Jun-17 11:25","TXT file","1 KB"))
    # Level 2
    w.prefTreeviewScTrv.insert(folder1, "end", "", text="photo1.png", values=("23-Jun-17 11:28","PNG file","2.6 KB"))
    w.prefTreeviewScTrv.insert(folder1, "end", "", text="photo2.png", values=("23-Jun-17 11:29","PNG file","3.2 KB"))
    w.prefTreeviewScTrv.insert(folder1, "end", "", text="photo3.png", values=("23-Jun-17 11:30","PNG file","3.1 KB"))

Whenever I run the program, it runs and create the tree columns and heading properly but I get an exception when using the insert method no matter what index I give the item 0 or 1:

  Traceback (most recent call last):
    File "C:\page\tenders\notebook_support.py", line 127, in <module>
      notebook.vp_start_gui()
    File "C:\page\tenders\notebook.py", line 30, in vp_start_gui
      notebook_support.init(root, top)
    File "C:\page\tenders\notebook_support.py", line 115, in init
      initTree()
    File "C:\page\tenders\notebook_support.py", line 102, in initTree
      w.prefTreeviewScTrv.insert("", 1, "", text="first_file.txt", values=("22-Jun-16 11:25","first file","0.5 KB"))
    File "C:\Users\ori\AppData\Local\Programs\Python\Python38-32\lib\tkinter\ttk.py", line 1365, in insert
      res = self.tk.call(self._w, "insert", parent, index, _tkinter.TclError: Item  already exists

what am I doing wrong?

You are defining: w.prefTreeviewScTrv["columns"]=("one","two","three"): but it seems that there are 4 columns. Have you forgotten the first column? — Laurent LAPORTE
– Laurent LAPORTE, Commented Feb 8, 2020 at 18:29

Maximouse · Accepted Answer · 2020-02-08 18:32:52Z

3

The problem is that every time you insert an item, you set its ID to "". This is the ID of the root item. Because different items must have different IDs, this doesn't work. You need to remove the third argument in all calls to insert():

# Level 1
w.prefTreeviewScTrv.insert("", 1, text="first_file.txt", values=("22-Jun-16 11:25","first file","0.5 KB"))
folder1=w.prefTreeviewScTrv.insert("", 2, text="Folder 1", values=("23-Jun-17 11:05","File folder",""))
w.prefTreeviewScTrv.insert("", 3, text="text_file.txt", values=("23-Jun-17 11:25","TXT file","1 KB"))
# Level 2
w.prefTreeviewScTrv.insert(folder1, "end", text="photo1.png", values=("23-Jun-17 11:28","PNG file","2.6 KB"))
w.prefTreeviewScTrv.insert(folder1, "end", text="photo2.png", values=("23-Jun-17 11:29","PNG file","3.2 KB"))
w.prefTreeviewScTrv.insert(folder1, "end", text="photo3.png", values=("23-Jun-17 11:30","PNG file","3.1 KB"))

answered Feb 8, 2020 at 18:32

Maximouse

4,4031 gold badge16 silver badges30 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Laurent LAPORTE Over a year ago

Or, the OP can generate valid IDs…

Collectives™ on Stack Overflow

problem using tkinter treeview widget and page gui builder

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related