a python ncurse app with two column

example-ncurse.py

import curses
import time

def main(stdscr):
    # Turn off cursor blinking
    curses.curs_set(0)

    # Color pair definitions
    curses.init_pair(1, curses.COLOR_WHITE, curses.COLOR_BLUE)
    curses.init_pair(2, curses.COLOR_BLACK, curses.COLOR_WHITE)

    # Get screen height and width
    height, width = stdscr.getmaxyx()
    
    # Calculate column width (half of screen width)
    col_width = width // 2

    # Create windows for both columns
    left_col = curses.newwin(height, col_width, 0, 0)
    right_col = curses.newwin(height, col_width, 0, col_width)

    # Create borders for both columns
    left_col.box()
    right_col.box()

    # Add titles to columns
    left_col.addstr(0, 2, "Left Column", curses.A_BOLD)
    right_col.addstr(0, 2, "Right Column", curses.A_BOLD)

    # Sample data for both columns
    left_items = ["Item 1", "Item 2", "Item 3", "Item 4", "Item 5"]
    right_items = ["Data A", "Data B", "Data C", "Data D", "Data E"]

    # Selected item index
    selected_left = 0
    selected_right = 0

    while True:
        # Display items in left column
        for idx, item in enumerate(left_items):
            if idx == selected_left:
                left_col.attron(curses.color_pair(1))
                left_col.addstr(idx + 2, 2, item)
                left_col.attroff(curses.color_pair(1))
            else:
                left_col.addstr(idx + 2, 2, item)

        # Display items in right column
        for idx, item in enumerate(right_items):
            if idx == selected_right:
                right_col.attron(curses.color_pair(1))
                right_col.addstr(idx + 2, 2, item)
                right_col.attroff(curses.color_pair(1))
            else:
                right_col.addstr(idx + 2, 2, item)

        # Add instructions at the bottom
        stdscr.addstr(height-1, 0, "Use arrow keys to navigate. Press 'q' to quit.")

        # Refresh the screen
        left_col.refresh()
        right_col.refresh()
        stdscr.refresh()

        # Get user input
        key = stdscr.getch()

        if key == ord('q'):
            break
        elif key == curses.KEY_UP:
            if selected_left > 0:
                selected_left -= 1
        elif key == curses.KEY_DOWN:
            if selected_left < len(left_items) - 1:
                selected_left += 1
        elif key == curses.KEY_LEFT:
            selected_right = selected_left
        elif key == curses.KEY_RIGHT:
            selected_left = selected_right

        # Clear the windows for next iteration
        left_col.clear()
        right_col.clear()
        
        # Redraw borders
        left_col.box()
        right_col.box()
        
        # Redraw titles
        left_col.addstr(0, 2, "Left Column", curses.A_BOLD)
        right_col.addstr(0, 2, "Right Column", curses.A_BOLD)

def init():
    curses.wrapper(main)

if __name__ == '__main__':
    init()