I have paused a script for lets say 3500 seconds by using time module for ex time.sleep(3500).
Now, my aim is to scan for keypresses while the script is on sleep, i mean its on this line.
Its like I want to restart the script if a "keypress Ctrl+R" is pressed.
For ex.. consider
#!/usr/bin/python
import time
print "Hello.. again"
while True:
time.sleep(3500)
Now while the code is at last line, If i press Ctrl+R, i want to re-print "Hello.. again" line.
I am aware that this does not fully answer your question, but you could do the following:
perform_actions. Call it when the program starts.Thus one interrupt behaves as you want ctrl+r to behave. Two quick interrupts quit the program.
import time
def perform_actions():
print("Hello.. again")
try:
while True:
perform_actions()
try:
while True: time.sleep(3600)
except KeyboardInterrupt:
time.sleep(0.5)
except KeyboardInterrupt:
pass
A nice side-effect of using a signal (in this case SIGINT) is that you also restart the script through other means, e.g. by running kill -int <pid>.
You may want to use Tkinter {needs X :(}
#!/usr/bin/env python
from Tkinter import * # needs python-tk
root = Tk()
def hello(*ignore):
print 'Hello World'
root.bind('<Control-r>', hello)
root.mainloop() # starts an X widget
This script prints Hello World to the console if you press ctrl+r
See also Tkinter keybindings. Another solution uses GTK can be found here
in a for loop sleep 3500 times for 1 second checking if a key was pressed each time
# sleep for 3500 seconds unless ctrl+r is pressed
for i in range(3500):
time.sleep(1)
# check if ctrl+r is pressed
# if pressed -> do something
# otherwise go back to sleep
