Print to standard console in curses

Question

I'm building a python curses application.

I have two ways of printing to the curses window: print x, and windows.addstr(x) (and the other similar window.* options).

However, for debugging purposes, I'd like to be able to print to the standard console, so when I exit the curses window, I have the infomation waiting for me to be seen. I would normally just use print x, but that prints to the curses window.

sys.stout.write() also fails.

How can I do this?

After using sys.stdout after os.fdopen, this is the traceback

 curses.nocbreak()
 _curses.error: nocbreak() returned ERR
 close failed in file object destructor:
 sys.excepthook is missing
 lost sys.stderr

Answer 1

To do as you say, here is a snippet I used:

class StdOutWrapper:
    text = ""
    def write(self,txt):
        self.text += txt
        self.text = '\n'.join(self.text.split('\n')[-30:])
    def get_text(self,beg,end):
        return '\n'.join(self.text.split('\n')[beg:end])

if __name__ == "__main__":
    mystdout = StdOutWrapper()
    sys.stdout = mystdout
    sys.stderr = mystdout

    screen = curses.initscr()
    curses.noecho()
    curses.cbreak()

    # do your stuff here
    # you can also output mystdout.get_text() in a ncurses widget in runtime

    screen.keypad(0)
    curses.nocbreak()
    curses.echo()
    curses.endwin()
    sys.stdout = sys.__stdout__
    sys.stderr = sys.__stderr__
    sys.stdout.write(mystdout.get_text())

The neat thing with that trick, is that you can also output your stdout during ncurse runtime in a widget. Of course the internal representation of StdOutWrapper can be tweaked as you want, to better match your needs.