如何在 Python curses 中创建菜单和子菜单?

AFAIK，Python 中还没有可用的 curses 菜单扩展，因此您必须推出自己的解决方案.我知道这个补丁 http://bugs.python.org/issue1723038 但我不知道它的当前状态.我找到了一个很好的 Python 类，它在 http://www.promisc.org/blog/?p=33 但我也有这个问题.我想制作一个菜单，用户可以在其中选择突出显示的元素，但不是立即执行特定操作，我想显示另一个菜单，然后可能是另一个，要求输入等.我的第一个想法是删除现有的 cmenuscreen.clear() 或 cleanup() 但在绘制新菜单之前不会删除旧菜单，新菜单如下所示:

AFAIK, there is no curses menu extension available in Python yet so you have to roll your own solution. I know about this patch http://bugs.python.org/issue1723038 but I don't what's the current state of it. I found a nice class for Python that wraps what I want called 'cmenu' here http://www.promisc.org/blog/?p=33 but I have a problem with that too. I want to make a menu where user can choose a highlighted element but instead of executing a particular action right away I want to display another menu, and then maybe another, ask for some input etc. My first thought was to remove the existing cmenu with screen.clear() or cleanup() but the old menu is not removed before the new one is drawn and the new menu looks like this:

    0. top
    1. Exit
    2. Another menu
-- end of the old menu that should go away --
    3. first
    4. second
    5. third

在 cmenu() 中没有删除项目的 remove() 方法.我想旧菜单没有被清除的事实是由 display() 方法中的while True"循环引起的，但是当我删除它时，发生了一些奇怪的事情.我使用的是 Python 2.7，这是我当前的代码:

There is no remove() method for removing an item in cmenu(). I guess the fact that the old menu is not cleared is caused by 'while True' loop in display() method but when I removed it some weird stuff was going on. I am using Python 2.7, this is my current code:

#!/usr/bin/python
#
# Adapted from:
# http://blog.skeltonnetworks.com/2010/03/python-curses-custom-menu/
#
# Goncalo Gomes
# http://promisc.org
#

import signal
signal.signal(signal.SIGINT, signal.SIG_IGN)

import os
import sys
import curses
import traceback
import atexit
import time

import sys
reload(sys)
sys.setdefaultencoding("utf-8")

class cmenu(object):
    datum = {}
    ordered = []
    pos = 0

    def __init__(self, options, title="python curses menu"):
        curses.initscr()
        curses.start_color()
        curses.init_pair(1, curses.COLOR_RED, curses.COLOR_WHITE)
        curses.curs_set(0)
        self.screen = curses.initscr()
        self.screen.keypad(1)

        self.h = curses.color_pair(1)
        self.n = curses.A_NORMAL

        for item in options:
            k, v = item.items()[0]
            self.datum[k] = v
            self.ordered.append(k)

        self.title = title

        atexit.register(self.cleanup)

    def cleanup(self):
        curses.doupdate()
        curses.endwin()

    def upKey(self):
        if self.pos == (len(self.ordered) - 1):
            self.pos = 0
        else:
            self.pos += 1

    def downKey(self):
        if self.pos <= 0:
            self.pos = len(self.ordered) - 1
        else:
            self.pos -= 1

    def display(self):
        screen = self.screen

        while True:
            screen.clear()
            screen.addstr(2, 2, self.title, curses.A_STANDOUT|curses.A_BOLD)
            screen.addstr(4, 2, "Please select an interface...", curses.A_BOLD)

            ckey = None
            func = None

            while ckey != ord('\n'):
                for n in range(0, len(self.ordered)):
                    optn = self.ordered[n]

                    if n != self.pos:
                        screen.addstr(5 + n, 4, "%d. %s" % (n, optn), self.n)
                    else:
                        screen.addstr(5 + n, 4, "%d. %s" % (n, optn), self.h)
                screen.refresh()

                ckey = screen.getch()

                if ckey == 258:
                    self.upKey()

                if ckey == 259:
                    self.downKey()

            ckey = 0
            self.cleanup()
            if self.pos >= 0 and self.pos < len(self.ordered):
                self.datum[self.ordered[self.pos]]()
                self.pos = -1
            else:
                curses.flash()



def top():
    os.system("top")

def exit():
    sys.exit(1)

def submenu():
    # c.screen.clear()     # nope
    # c.cleanup()          # nope
    submenu_list = [{"first": exit}, {"second": exit}, {"third": exit}]
    submenu = cmenu(submenu_list)
    submenu.display()

try:

    list = [{ "top": top }, {"Exit": exit}, {"Another menu": submenu}]

    c = cmenu(list)

    c.display()

except SystemExit:
    pass
else:
    #log(traceback.format_exc())
    c.cleanup()