input/ldompel...@casema.nl wrote:
> > choices = raw_input("letter s to stop:")
>
> Oh no, this is not what I want. Now it is waiting for input when its go
> further with the script. Because I have an while True: so I want that the
> script go's continue only when I press a key then it must stop the script.
Solutions to that problem are OS-dependent. For Unix terminals
https://docs.python.org/2/faq/library.html#how-do-i-get-a-single-keypress-at-a-time
shows one way which I used to write the contextmanager below:
$ cat capture_key.py
import termios, fcntl, sys, os
from contextlib import contextmanager
@contextmanager
def nonblocking(stdin=None):
if stdin is None:
stdin = sys.stdin
fd = sys.stdin.fileno()
oldterm = termios.tcgetattr(fd)
newattr = termios.tcgetattr(fd)
newattr[3] = newattr[3] & ~termios.ICANON & ~termios.ECHO
termios.tcsetattr(fd, termios.TCSANOW, newattr)
oldflags = fcntl.fcntl(fd, fcntl.F_GETFL)
fcntl.fcntl(fd, fcntl.F_SETFL, oldflags | os.O_NONBLOCK)
def read(n):
try:
return stdin.read(n)
except IOError:
return ""
try:
yield read
finally:
termios.tcsetattr(fd, termios.TCSAFLUSH, oldterm)
fcntl.fcntl(fd, fcntl.F_SETFL, oldflags)
Put the capture_key.py module into the same folder as your script and use it
like in the demo below:
from capture_key import nonblocking
# put your code here
with nonblocking() as read:
print("letter s to stop:")
while True:
enable_servo()
servo(90)
mindist = 80
choices = read(1)
if choices == 's':
print("stop")
break
if mindist > us_dist(15):
bwd()
print("backward 1x")
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