How to Rewrite Multiple Lines in the Console for Dynamic Text Modification?

Rewriting Multiple Lines in the Console for Dynamic Text Modification

In text-based applications, it is often necessary to update and rewrite multiple lines in the console for dynamic user interaction. This can present a challenge when attempting to preserve the layout and presentation of the display.

In various operating systems, different methods exist to achieve this behavior:

Unix

• Utilize the curses module, providing control over the terminal's cursor and screen operations.

Windows

There are several options available:

• PDCurses: A portable curses implementation for Windows.
• Console: Recommended by the Python documentation (https://docs.python.org/3/library/console.html).
• wconio: A Windows-specific module for console manipulation.
• win32console: A low-level interface for Windows console functions.

Sample Code Using curses

The following Python code demonstrates the use of curses to rewrite multiple lines in a terminal:

import curses
import time

def report_progress(filename, progress):
    """progress: 0-10"""
    stdscr.addstr(0, 0, "Moving file: {}".format(filename))
    stdscr.addstr(1, 0, "Total progress: [{1:10}] {0}%".format(progress * 10, "#" * progress))
    stdscr.refresh()

if __name__ == "__main__":
    stdscr = curses.initscr()
    curses.noecho()
    curses.cbreak()

    try:
        for i in range(10):
            report_progress("file_{0}.txt".format(i), i+1)
            time.sleep(0.5)
    finally:
        curses.echo()
        curses.nocbreak()
        curses.endwin()

This code uses curses to initialize a text-based screen, disable echo and line buffering, print text on the screen, and refresh the display. By repeatedly calling the report_progress function, multiple lines in the console can be dynamically updated.

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