deleting the terminal prompt?

[MackS]

Dear all,

I just noticed the following behavior when I run

import os
import sys
import readline

histfile = os.path.join(os.environ["HOME"], ".pyhist")

try:
readline.read_history_file(histfile)
except IOError:
pass

import atexit
atexit.register(readline.write_history_file, histfile)
del os, histfile

while cmd != "":

sys.stdout.write("prompt: ")
cmd = raw_input()

# at this point it studies the contents of cmd and decides what to
do next.

However, if the user simply presses Tab followed by a backspace s/he
effectively makes the prompt disappear. Is there a way to prevent this
from happening?
Thanks for any help,

Mack

[Dennis Lee Bieber]

On 15 May 2005 16:32:57 -0700, "MackS" <ma***********@hotmail.com>
declaimed the following in comp.lang.python:

while cmd != "":

sys.stdout.write("prompt: ")
cmd = raw_input()

# at this point it studies the contents of cmd and decides what to
do next.

However, if the user simply presses Tab followed by a backspace s/he
effectively makes the prompt disappear. Is there a way to prevent this
from happening?
What behavior does...

while cmd != "":
cmd = raw_input("prompt: ")

.... give you?

-- ================================================== ============ <
wl*****@ix.netcom.com | Wulfraed Dennis Lee Bieber KD6MOG <
wu******@dm.net | Bestiaria Support Staff <
================================================== ============ <
Home Page: <http://www.dm.net/~wulfraed/> <
Overflow Page: <http://wlfraed.home.netcom.com/> <

[MackS]

Thanks, Dennis, that solved it.

Cheers

Mack

Dennis Lee Bieber wrote:

On 15 May 2005 16:32:57 -0700, "MackS" <ma***********@hotmail.com>
declaimed the following in comp.lang.python:

while cmd != "":

sys.stdout.write("prompt: ")
cmd = raw_input()

# at this point it studies the contents of cmd and decides what to do next.

However, if the user simply presses Tab followed by a backspace s/he effectively makes the prompt disappear. Is there a way to prevent this from happening?

What behavior does...

while cmd != "":
cmd = raw_input("prompt: ")

... give you?

--

> ================================================== ============ <
> wl*****@ix.netcom.com | Wulfraed Dennis Lee Bieber KD6MOG <
> wu******@dm.net | Bestiaria Support Staff <
> ================================================== ============ <
> Home Page: <http://www.dm.net/~wulfraed/> <
> Overflow Page: <http://wlfraed.home.netcom.com/> <

[Dennis Lee Bieber]

On 15 May 2005 18:01:18 -0700, "MackS" <ma***********@hotmail.com>
declaimed the following in comp.lang.python:

Thanks, Dennis, that solved it.
Good to know.

I'll confess, I hadn't double-checked the behavior myself -- I
was hoping that the coders of raw_input() were smart enough to ensure
that the prompt string that it takes was refreshed if the user ran
back-spaces/deletes/etc. I jumped on that since it looked like you
hadn't realized it /had/ a prompt argument, and the disjoint write/input
sequence has no common state information.

-- ================================================== ============ <
wl*****@ix.netcom.com | Wulfraed Dennis Lee Bieber KD6MOG <
wu******@dm.net | Bestiaria Support Staff <
================================================== ============ <
Home Page: <http://www.dm.net/~wulfraed/> <
Overflow Page: <http://wlfraed.home.netcom.com/> <