python curses addstr 错误 - 但仅在我的电脑上

Question

我在写一个小程序，这个程序会从一个列表生成一个菜单，使用的是curses库（就是Python自带的那个库）。在这个过程中，我遇到了一个奇怪的问题（如果你想看，我下面有这个程序的详细注释版）。简单来说，当我用os.listdir生成的列表时，curses会崩溃，显示addstr错误，但如果我用一个固定的列表，就没问题。这听起来完全没有道理，对吧？列表就是列表，不管叫什么名字，列表应该都是一样的，对吧？

事情变得更复杂了。我把代码发给了一个主要用python2.6的朋友（而我最开始是用python3.1写的）。他取消了broken_input()的注释（这个函数用来获取os.listdir生成的信息），他说对他来说一切正常。我同时安装了python 2.6和3.1，所以我把程序的开头改成让它在2.6下运行，结果（在取消注释broken_input()后）对我来说，还是出现了addstr错误（但用固定输入运行就没问题……不过这除了证明概念外，完全没用）。

所以，我的问题是：我的Python安装有什么问题吗？（我在用Ubuntu lucid，安装了python2.6.5和3.1），如果有，我该怎么修复它，让curses能正常执行这个代码。如果不是我的Python安装，那我该怎么用curses实现同样的功能（也就是：从一个包含任意数量项目的列表中绘制一个菜单，并给这些项目编号，让用户可以根据编号选择）。

#!/usr/bin/env python3.1
"""curses_mp3eater.py: a curses-based implementation of my mp3eater program;
diplays the contents of cwd, allows user to make a selection. But I'm having
problems getting it to iterate over a list.
v0.1 03.14.11
by skookie sprite
address@gmail.com
"""

import curses, curses.wrapper, os, sys


def working_input():
    """the following is demo code to demonstrate my problem... main will accept the following,
    but won't accept the product of a directorylist for reasons that I can't figure out."""
    dircontents=['this','is','a','list','','and','it','will','iterate','fine','in','the','(main) function.']
    return dircontents

def broken_input():
    """this is the code that I NEED to have work... but for reasons beyond me will not iterate in
    the main function. It's a simple list of the contents of the CWD."""
    cwd=os.getcwd()
    dircontents=[]
    for item in os.listdir(cwd):
        dircontents += [item]
    return dircontents

def main(stdscr):
    """This is the program. Designed to take a list of stuff and display it. If I can solve
    that hurdle, I'll add selection mechanisms, and break it across screens - amongst other
    things. But, currently, it can only accept the demo code. Uncomment one or the other to
    see what I mean."""
    #broken_input returns an addstr() ERR, but I don't see the difference between working_input
    #and broken_input as they are both just lists. 
    #working_input() is demo code that illustrates my problem
    stuffin=working_input()
    #stuffin=broken_input()

    #the rest of this stuff works. The problem is with the input. Why?
    linenumber=int()
    linenumber=6
    itemnumber=int()
    itemnumber=1

    stdscr.clear()
    stdscr.border(0)

    for item in stuffin:
        stdscr.addstr(linenumber, 10, '%s   -   %s' % (itemnumber, item), curses.A_NORMAL)
        linenumber += 1
        itemnumber += 1

    curses.doupdate()
    stdscr.getch()



if __name__ == '__main__':
    curses.wrapper(main)

ubuntu 错误调试 Python2.6 列表处理 curses 终端编程菜单生成 python3.1

python curses addstr 错误 - 但仅在我的电脑上

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