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Is there getchar in sage?

asked 2012-04-12 14:31:59 +0200

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Is there a function in sage equivalent to the getchar function from C language?

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answered 2012-04-12 15:10:27 +0200

kcrisman gravatar image

You really want this function in Python, I guess. Here are two relevant links I found, knowing nothing about getchar; I bet you will be able to do better.

Apparently it's nontrivial to get something that works exactly the same.

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answered 2012-04-13 00:15:16 +0200

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What sort of thing are you trying to do? Maybe there is a more natural way in python than getchar...

To get a user string in python, often the raw_input function is used.

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answered 2012-04-13 16:11:36 +0200

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Modify to your tastes:

def key_pressed(self):
    """
    Tests whether we received a key press without blocking.

    This works by making stdin temporarily non-blocking, and then
    reading a single char.
    """
    import fcntl
    fl = fcntl.fcntl(sys.stdin, fcntl.F_GETFL)
    fcntl.fcntl(sys.stdin, fcntl.F_SETFL, fl | os.O_NONBLOCK)
    try: 
        key = os.read(sys.stdin.fileno(), 1)
    except OSError: 
        return False
    finally:
        fcntl.fcntl(sys.stdin, fcntl.F_SETFL, fl)
    print 'User pressed key '+key
    return True
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Asked: 2012-04-12 14:31:59 +0200

Seen: 252 times

Last updated: Apr 13 '12