Curses keypad(True) 没有特殊键

Curses keypad(True) does not get special keys

我正在尝试为 Python 2 和 3 编写代码。这是我用来学习诅咒的完整代码:

# -*- coding: utf-8 -*-
from __future__ import print_function

import curses
import sys
import traceback


class Cursor(object):
    def __init__(self):
        self.stdscr = curses.initscr()
        curses.noecho()
        curses.cbreak()
        self.stdscr.keypad(True)

    def end_window(self):
        curses.nocbreak()
        self.stdscr.keypad(False)
        curses.echo()
        curses.endwin()

    def start_win(self, begin_x=0, begin_y=1, height=24, width=71):
        return curses.newwin(height, width, begin_y, begin_x)


def applic():
    print("yo man")
    x = Cursor()
    window = x.start_win()
    try:
        # This raises ZeroDivisionError when i == 10.
        for i in range(0, 11):
            v = i - 10
            key = window.getch()
            # EDIT - Added this debug line to verify what key gets
            window.addstr('type of {} is {}\n'.format(key, type(key)))
            if key == curses.KEY_UP:
                return
            window.addstr('10 divided by {} is {}\n'.format(v, 10 // v))
            window.refresh()

    except Exception:
        x.end_window()
        errorstring = sys.exc_info()[2]
        traceback.print_tb(errorstring)

applic()

我的问题是 key 永远不会等于 curses.KEY_UP 因为 getch()(或 getkey())返回的是单个字符串,而不是等于 [=30= 的整个转义键代码](\x1b]A)。因此,每次我在例程中按向上箭头时,程序都会循环显示关键代码 \x1b[A 的三个部分,并产生三行输出:

10 divided by -10 is -1
10 divided by -9 is -2
10 divided by -8 is -2

对于此测试,我希望向上箭头键允许我在 i 等于 10 时发生的预期异常之前中断。

根据 Curses 的 python 文档,stdscr.keypad(True) 应该允许返回整个密钥代码,但似乎没有这样做。

添加了一些调试打印输出信息以显示返回的内容。无论我使用 getch() 还是 getkey(),结果都是一样的;它 returns 一个字符串(文档表明将为 getch 返回一个整数):

type of ^[ is <class 'str'>
10 divided by -9 is -2
type of [ is <class 'str'>
10 divided by -8 is -2
type of A is <class 'str'>
10 divided by -7 is -2

问题是您在主 window 上设置了 keypad 属性,但使用 getch 从另一个 window 读取。此更改将使您的程序接受 KEY_UP:

--- curses-vs-keypad.py 2017/04/02 11:07:41     1.1
+++ curses-vs-keypad.py 2017/04/03 00:57:16
@@ -28,6 +28,7 @@
     print("yo man")
     x = Cursor()
     window = x.start_win()
+    window.keypad(True)
     try:
         # This raises ZeroDivisionError when i == 10.
         for i in range(0, 11):