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The following code works on Python versions prior to 3.3a1:
import curses
def test_screen(screen):
 screen.addch(5,5, curses.ACS_HLINE)
 screen.refresh()
curses.wrapper(test_screen)
On python3.3, the program produces the following traceback:
Traceback (most recent call last):
 File "/tmp/p.py", line 7, in <module>
 curses.wrapper(test_screen)
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/curses/__init__.py", line 94, in wrapper
 return func(stdscr, *args, **kwds)
 File "/tmp/p.py", line 4, in test_screen
 screen.addch(5,5, curses.ACS_HLINE)
OverflowError: byte doesn't fit in chtype