How to Update Previous Console Lines in Python?

Rewriting Multiple Lines in the Console

Question:

Is it possible to edit previous lines printed in the console and rewrite multiple lines, similar to updating a text-based RPG or a progress bar?

Answer:

Unix

Utilize the curses module for this functionality.

Windows

Consider the following options:

• PDCurses: https://www.lfd.uci.edu/~gohlke/pythonlibs/
• Console (as recommended in the linked HOWTO)
• wconio: http://newcenturycomputers.net/projects/wconio.html
• win32console: http://docs.activestate.com/activepython/2.6/pywin32/win32console.html

Example using curses (Unix):

import curses
import time

def report_progress(filename, progress):
    """progress: 0-10"""
    stdscr.addstr(0, 0, "Moving file: {0}".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()

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