uses this method to implement the option for the user to rename the column headers: To rename headers in the tksheet GUI, you can use the set_sheet_data() method

. Here's a simple example to help you get started:
python

import tksheet

# Create the main window
root = tksheet.Tk()

# Create a tksheet widget
sheet = tksheet.Sheet(root)
sheet.pack(expand=True, fill='both')

# Sample data with headers
data = [
    ['Old Header 1', 'Old Header 2', 'Old Header 3'],
    [1, 2, 3],
    [4, 5, 6]
]

# Insert data into the sheet
sheet.set_sheet_data(data)

# Rename headers
sheet.set_sheet_data([['New Header 1', 'New Header 2', 'New Header 3']] + data[1:])

# Start the main loop
root.mainloop()

In this example, the headers are renamed from Old Header 1, Old Header 2, and Old Header 3 to New Header 1, New Header 2, and New Header 3
.Python 3.12 code: import tkinter as tk
from tksheet import Sheet
import json
from pathlib import Path
import ctypes


def set_dpi_awareness():
    """Enable DPI awareness to ensure high DPI settings are supported."""
    try:
        ctypes.windll.shcore.SetProcessDpiAwareness(1)
    except Exception as e:
        print(f"Error setting DPI awareness: {e}")


class TableApp:
    def __init__(self, root):
        """Initialize the Table Editor application."""
        self.root = root
        self.root.title("Table Editor with Sidebar")
        self.root.geometry("1280x720")

        self.sidebar = tk.Frame(root, width=200, bg='#F7F8FC', bd=0, relief='flat')
        self.sidebar.pack(expand=False, fill='y', side='left', anchor='nw')

        self.separator = tk.Frame(root, width=100, bg='white', bd=0, relief='flat')
        self.separator.pack(expand=False, fill='y', side='left', anchor='nw')

        self.main_frame = tk.Frame(root)
        self.main_frame.pack(expand=True, fill='both', side='right')

        self.header_frame = tk.Frame(self.main_frame, height=50, bg='white')
        self.header_frame.pack(fill='x')

        self.filter_label = tk.Label(self.header_frame, text="Filter:", bg='white', anchor="w")
        self.filter_label.pack(side='left', padx=5, pady=10)

        self.filter_entry = tk.Entry(self.header_frame)
        self.filter_entry.pack(side='left', padx=5, pady=10)
        self.filter_entry.bind("<KeyRelease>", lambda event: self.apply_filter())

        self.table_frame = tk.Frame(self.main_frame, bg='white')
        self.table_frame.pack(expand=True, fill='both')

        self.new_table_button = tk.Button(
            self.sidebar,
            text="New Table",
            command=self.create_new_table,
            bg='#F7F8FC',
            borderwidth=0,
            highlightthickness=0,
            relief='flat'
        )
        self.new_table_button.pack(padx=10, pady=10, fill='x')

        self.table_listbox = tk.Listbox(
            self.sidebar,
            bg='#F7F8FC',
            borderwidth=0,
            highlightthickness=0,
            relief='flat',
            selectbackground='#EAEDEF',
            selectforeground='black',
            activestyle='none'
        )
        self.table_listbox.pack(expand=True, fill='both', padx=10, pady=10)
        self.table_listbox.bind('<<ListboxSelect>>', self.load_selected_table)
        self.table_listbox.bind('<Double-1>', self.begin_rename)

        self.save_file_dir = Path("tables")
        self.tables = {}
        self.original_data = {}

        self.rename_entry = None
        if not self.save_file_dir.exists():
            self.save_file_dir.mkdir()
        self.load_tables()

    def create_new_table(self):
        """Create a new table and add it to the available tables list."""
        table_name = f"Table {len(self.tables) + 1}"
        self.add_table(table_name)

    def add_table(self, table_name, data=None):
        """Add a table to the UI and internal storage."""
        self.tables[table_name] = Sheet(
            self.table_frame,
            data=data if data else [["" for _ in range(5)] for _ in range(10)]
        )
        self.tables[table_name].enable_bindings()
        self.tables[table_name].extra_bindings([
            ("end_edit_cell", lambda event, table_name=table_name: self.save_data(table_name)),
        ])
        self.tables[table_name].pack_forget()
        self.original_data[table_name] = self.tables[table_name].get_sheet_data()
        self.table_listbox.insert('end', table_name)

    def begin_rename(self, _):
        """Begin renaming of the table name in the listbox."""
        selection = self.table_listbox.curselection()
        if selection:
            index = selection[0]
            current_name = self.table_listbox.get(index)

            bbox = self.table_listbox.bbox(index)
            if not bbox:
                return

            listbox_x = self.table_listbox.winfo_x()
            listbox_y = self.table_listbox.winfo_y()

            bbox_x, bbox_y, bbox_width, bbox_height = bbox
            entry_x = listbox_x + bbox_x
            entry_y = listbox_y + bbox_y

            self.rename_entry = tk.Entry(
                self.sidebar,
                bg='#EAEDEF',
                fg='black',
                selectbackground='#EAEDEF',
                selectforeground='black',
                borderwidth=0,
                relief='flat',
                highlightthickness=0
            )

            entry_width = self.table_listbox.winfo_width()

            self.rename_entry.place(
                x=entry_x,
                y=entry_y,
                width=entry_width,
                height=bbox_height
            )
            self.rename_entry.insert(0, current_name)
            self.rename_entry.focus()
            self.rename_entry.configure(font=self.table_listbox.cget("font"))
            self.rename_entry.bind('<Return>', lambda _: self.end_rename(index))
            self.rename_entry.bind('<FocusOut>', lambda _: self.cancel_rename())

    def end_rename(self, index):
        """Finish the renaming process and update the table name."""
        new_name = self.rename_entry.get().strip()
        current_name = self.table_listbox.get(index)

        if new_name and new_name != current_name and new_name not in self.tables:
            self.tables[new_name] = self.tables.pop(current_name)
            self.original_data[new_name] = self.original_data.pop(current_name)

            self.table_listbox.delete(index)
            self.table_listbox.insert(index, new_name)

            current_file = self.save_file_dir / f"{current_name}.json"
            new_file = self.save_file_dir / f"{new_name}.json"

            if current_file.exists():
                current_file.rename(new_file)

        self.rename_entry.destroy()
        self.rename_entry = None

    def cancel_rename(self):
        """Cancel the renaming process."""
        if self.rename_entry:
            self.rename_entry.destroy()
            self.rename_entry = None

    def load_tables(self):
        """Load existing tables from the directory."""
        for file_path in self.save_file_dir.glob("*.json"):
            table_name = file_path.stem
            with file_path.open('r') as file:
                data = json.load(file)
                self.add_table(table_name, data)

    def load_selected_table(self, _=None):
        """Display the selected table and hide others."""
        selection = self.table_listbox.curselection()
        for sheet in self.tables.values():
            sheet.pack_forget()

        if selection:
            selected_table_name = self.table_listbox.get(selection[0])
            self.tables[selected_table_name].pack(expand=True, fill='both')
            self.apply_filter()
        else:
            self.table_frame.configure(bg='white')

    def save_data(self, table_name):
        """Save current data of a table to a file."""
        data = self.tables[table_name].get_sheet_data()
        file_path = self.save_file_dir / f"{table_name}.json"
        with file_path.open('w') as file:
            json.dump(data, file)
        print(f"Data for {table_name} saved successfully.")

    def apply_filter(self):
        """Apply filtering based on the entered term."""
        term = self.filter_entry.get().lower()
        selection = self.table_listbox.curselection()
        if selection:
            table_name = self.table_listbox.get(selection[0])
            original_data = self.original_data[table_name]

            filtered_data = [
                row for row in original_data if any(term in str(cell).lower() for cell in row)
            ]

            self.tables[table_name].set_sheet_data(filtered_data)


if __name__ == "__main__":
    set_dpi_awareness()
    root = tk.Tk()
    app = TableApp(root)
    root.mainloop()