I use something like this: 
screen.addstr(text, color_pair(1) | A_BOLD), but it doesn't seem to work..
However, A_REVERSE and all others attribute does work! 
In fact, I'm trying to print something in white, but the COLOR_WHITE prints it gray.. and after a while of searching, it seems that printing it gray + BOLD makes it! 
Any helps would be greatly appreciated.
I tried this: screen.addstr(text, curses.color_pair(1) | curses.A_BOLD) and it worked!
So just add curses. and it should do the trick.
Of course at the beginning use: import curses
Attribute BOLD doesn't seem to work in my curses