My code is below:
import msvcrt
while True:
if msvcrt.getch() == 'q':
print "Q was pressed"
elif msvcrt.getch() == 'x':
sys.exit()
else:
print "Key Pressed:" + str(msvcrt.getch()
This code is based on this question; I was using it to acquaint myself with getch
.
I've noticed that it takes 3 pressing the key 3 times to output the text once. Why is this? I'm trying to use it as an event loop, and that's too much of a lag...
Even if I type 3 different keys, it only outputs the 3rd keypress.
How can I force it to go faster? Is there a better way to achieve what I'm trying to achieve?
Thanks!
evamvid
you call the function 3 times in your loop. try calling it only once like this:
import msvcrt
while True:
pressedKey = msvcrt.getch()
if pressedKey == 'q':
print "Q was pressed"
elif pressedKey == 'x':
sys.exit()
else:
print "Key Pressed:" + str(pressedKey)
You can optimize things a little bit by also using themsvcrt.kbhit
function which will allow you callmsvcrt.getch()
only as much as is necessary:
while True:
if msvcrt.kbhit():
ch = msvcrt.getch()
if ch in '\x00\xe0': # arrow or function key prefix?
ch = msvcrt.getch() # second call returns the scan code
if ch == 'q':
print "Q was pressed"
elif ch == 'x':
sys.exit()
else:
print "Key Pressed:", ch
Note that theKey Pressed
value printed won't make sense for things like function keys. That's because it those cases it's really the Windows scan code for the key, not a regular key code for the character.
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