Posting to python-dev as it is no more relates to the idea of improving print().
sys.stdout.write() in Python 3 causes backwards incompatible behavior that breaks recipe for unbuffered character reading from stdin on Linux - http://code.activestate.com/recipes/134892/ At first I though that the problem is in the new print() function, but it appeared that the culprit is sys.stdout.write() Attached is a test script which is a stripped down version of the recipe above. If executed with Python 2, you can see the prompt to press a key (even though output on Linux is buffered in Python 2). With Python 3, there is not prompt until you press a key. Is it a bug or intended behavior? What is the cause of this break? -- anatoly t.
import sys class _GetchUnix: def __init__(self): import tty, sys def __call__(self): import tty, termios fd = sys.stdin.fileno() old_settings = termios.tcgetattr(fd) try: tty.setraw(sys.stdin.fileno()) ch = sys.stdin.read(1) finally: termios.tcsetattr(fd, termios.TCSADRAIN, old_settings) return ch getch = _GetchUnix() sys.stdout.write("You choice:") sys.stdout.write( getch() + "\n")
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