PYTHON: Exiting a loop with a specified key

[EmilHem]

Hello. I'm wondering how I can use a while loop that's exited when the user presses 'e'.
I'm only intending to use this on Linux.

I'm using Python version 2.7.2+

Pseudocode:

while key_pressed('e') == False:
do awesome stuff here

or

while True:
do awesome stuff here
if key_pressed('e'):
break

[Arndt]

Hello. I'm wondering how I can use a while loop that's exited when the user presses 'e'.
I'm only intending to use this on Linux.

I'm using Python version 2.7.2+

Pseudocode:

while key_pressed('e') == False:
do awesome stuff here

or

while True:
do awesome stuff here
if key_pressed('e'):
break

Here is something I used a while ago. There may be cleaner solutions. I don't think termios exists on Windows.



import time
import sys
import select
import tty, termios

global old_settings

def setraw():
global old_settings
fd = sys.stdin.fileno()
old_settings = termios.tcgetattr(fd)
tty.setraw(sys.stdin.fileno())

def unsetraw():
global old_settings
fd = sys.stdin.fileno()
termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)


setraw()
timeout = 0

while True:
print "hello\r"
time.sleep(1)
sel = select.select([sys.stdin], [], [], timeout)
if sel[0]:
c = sys.stdin.read(1)
if ord(c) == 3:
break
print "%s\r" % c
if c == 'e':
break

unsetraw()

[EmilHem]

Thanks for the response.

I'm afraid that I'm getting this error when I run it:

Traceback (most recent call last):
File "/home/emil/Documents/Python programming workspace/check_keyboard_keys.py", line 21, in <module>
setraw()
File "/home/emil/Documents/Python programming workspace/check_keyboard_keys.py", line 11, in setraw
fd = sys.stdin.fileno()
AttributeError: 'PyShell' object has no attribute 'fileno'

I have python 2.7.2+ if it makes any difference.

[ofnuts]

Hello. I'm wondering how I can use a while loop that's exited when the user presses 'e'.
I'm only intending to use this on Linux.

I'm using Python version 2.7.2+

Pseudocode:

while key_pressed('e') == False:
do awesome stuff hereor

while True:
do awesome stuff here
if key_pressed('e'):
break
Use select.select() with a short timeout?

http://docs.python.org/library/select.html

[Arndt]

Thanks for the response.

I'm afraid that I'm getting this error when I run it:

Traceback (most recent call last):
File "/home/emil/Documents/Python programming workspace/check_keyboard_keys.py", line 21, in <module>
setraw()
File "/home/emil/Documents/Python programming workspace/check_keyboard_keys.py", line 11, in setraw
fd = sys.stdin.fileno()
AttributeError: 'PyShell' object has no attribute 'fileno'

I have python 2.7.2+ if it makes any difference.

What exactly is PyShell? I haven't used it. My program works if I run it an ordinary terminal emulator. Maybe PyShell has some other methods that do the same job.

[EmilHem]

What exactly is PyShell? I haven't used it. My program works if I run it an ordinary terminal emulator. Maybe PyShell has some other methods that do the same job.

Hmm. In IDLE it doesn't work I guess. That code does work in a normal terminal launching it with python [name of file.py]

In IDLE when I run it, it gives that error.

I think that that will do it. Thanks!