Python Exercise 1

"Display series of numbers (1,2,3,4, 5....etc) in an infinite loop. The program should quit if someone hits a specific key (Say ESCAPE key)."

This exercise, for me, was a royal pain in the neck, and I ended up scouring the web for a solution. I finally found something I could modify to make work. From my understanding, it basically runs the loop in my answer until it detects something in the terminal buffer, at which point it breaks. I have it set so that anything will stop it from running, but you should be able to modify it to only respond to a certain keystroke.

Click to see Solution:

#!/usr/bin/env python
import sys, termios, atexit
from select import select

# save the terminal settings
fd = sys.stdin.fileno()
new_term = termios.tcgetattr(fd)
old_term = termios.tcgetattr(fd)

# new terminal setting unbuffered
new_term[3] = (new_term[3] & ~termios.ICANON & ~termios.ECHO)

# switch to normal terminal
def set_normal_term():
termios.tcsetattr(fd, termios.TCSAFLUSH, old_term)

# switch to unbuffered terminal
def set_curses_term():
termios.tcsetattr(fd, termios.TCSAFLUSH, new_term)

def putch(ch):
sys.stdout.write(ch)

def getch():
return sys.stdin.read(1)

def getche():
ch = getch()
putch(ch)
return ch

def kbhit():
dr,dw,de = select([sys.stdin], [], [], 0)
return dr <> []

n=0

if __name__ == '__main__':
atexit.register(set_normal_term)
set_curses_term()

while 1:
if kbhit():
ch = getch()
break
print n
n +=1

print 'done'