以相同的诅咒多次打印-python

Question

I'm showing some live stats from a process with curses. I'm newby with this library, so I followed this example to implement what i need.

I write this small version which summarizes my problem:

import time
import curses

def draw_menu(stdscr):
    global data
    # Turn cursor off
    curses.curs_set(False)

    # Rendering text
    stdscr.addstr(2, 5, "Help me please")
    stdscr.addstr(5, 5, data)
    # Refresh the screen
    stdscr.refresh()
    time.sleep(3)

data = 'some initial value'
for i in xrange(2):
    curses.wrapper(draw_menu)
    # Do some stuff to update values shown in the menu
    data = 'updated value {}'.format(i)
    time.sleep(3)

After initial call to draw_menu, I need to update values displayed on menu. While update is running (in this example I used time.sleep), values are removed from window and it goes back to 'normal terminal mode', I don't know why.

I would like to update data while staying all time with this 'help me please' message & data displayed.

I think that I could solve this using threads but, since complete code is far more complicated, I would like to avoid threads.

How can I solve this?

Answer 1

Your example should put the loop inside the call to curses.wrapper, eg, something like

import curses

def draw_menu(stdscr):
    global data
    # Turn cursor off
    curses.curs_set(False)

    # Rendering text
    stdscr.addstr(2, 5, "Help me please")
    stdscr.addstr(5, 5, data)
    # Refresh the screen
    stdscr.refresh()
    curses.napms(3000)

def draw_menu_loop(w):
    global data
    data = 'some initial value'
    for i in xrange(2):
        draw_menu(w)
        # Do some stuff to update values shown in the menu
        data = 'updated value {}'.format(i)
    curses.napms(3000)

curses.wrapper(draw_menu_loop)

By the way (actually should be a new question), your example used time.sleep , which interferes with timely updates to the screen. Use curses.napms , which does not have that drawback.