向屏幕添加行時，Python Curses addwstr() 返回 ERR

Question

假設我將大量行添加到curses 屏幕。

最小的非工作示例：

import curses


class MyApp(object):

    def __init__(self, stdscreen):
        self.screen = stdscreen

        for i in range(0,100):

            self.screen.addstr(str(i) + '\n')
            self.screen.refresh()

        self.screen.getch()

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

上面的代碼返回：

Traceback (most recent call last):
  File "test.py", line 17, in <module>
    curses.wrapper(MyApp)
  File "/usr/lib/python3.7/curses/__init__.py", line 94, in wrapper
    return func(stdscr, *args, **kwds)
  File "test.py", line 11, in __init__
    self.screen.addstr(str(i) + '\n')
_curses.error: addwstr() returned ERR
Press ENTER to continue

---

1）這是什么錯誤？ 2）如果錯誤是因為我在屏幕上添加了太多行，我怎么能用curses列出這些條目？ 也許帶有某種滾動視圖？

Answer 1

我突然想到我可以使用try / except來確定可以在屏幕上打印的最大行數以避免此錯誤：

import curses


class MyApp(object):

    def __init__(self, stdscreen):
        self.screen = stdscreen

        maximum = self.maxlines()

        for i in range(maximum):

            self.screen.addstr(str(i) + '\n')
            self.screen.refresh()

        self.screen.getch()

    def maxlines(self):

        n = 0

        try:
            for i in range(100):
                self.screen.addstr(str(i) + '\n')
                n += 1

        except:
            pass

        self.screen.erase()

        return n


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