Re: [Tutor] command counter

[Dave Angel]

Crush  Wrote in message:
> My code is as follows...
> 
> count = 0
> while count < 3:
>   count += 1
>subprocess.Popen('command')
> if count == 3:
>   sys.exit()
> 
> 

The line beginning "subp" is indented further than the one before
 it, so this script would terminate with an indentation error.
 

Once you've fixed that we should look at the if statement. If the
 count is 3 it calls sys.exit. But of course count is 3, or we
 wouldn't have finished the while loop.  And you terminate anyway
 when you fall off the end of the script.  So why call sys.exit
 ()

Finally,  if you just want to something 3 times, why not use a for
 loop?

for count in range (3):
subproc...




-- 
DaveA

___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor

[Tutor] command counter

[Bo Morris]

Here is the shell script I am trying to recreate in python. Sorry for not
posting this with my other emails...I am a bit off today.


restart_count=10
count=10
restart=5

while ((count--)); do
avconv -v verbose -re -analyzeduration 0 | ./bmdplay -m 2 -f pipe:0
echo "Retry"

if [[ $count = 1 ]] && [[ $restart != 1 ]]; then

sleep 10


((restart--))
count=$restart_count
fi

done

echo "Gave up"
___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor

[Tutor] command counter

[Crush]

My code is as follows...

count = 0
while count < 3:
  count += 1
   subprocess.Popen('command')
if count == 3:
  sys.exit()

'command' is any command. For testing, I have been using the command 'xterm' 
just so I can see it opening. As far as error and pertaining to the above code, 
if I close the xterm window, have it open back up until the counter reaches the 
specified number.  

I am basically trying to recreate in python a shell script I use. The current 
shell script runs a real long avconv/ bmdplay command and if the command stops 
running, the script will try and rerun it until count equals n number. Again, I 
am only using xterm temporarily while I try to get the logic correct. Once 
correct, I can change the command and still have the same outcome...I think. 

I am not using a function. 
___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] command counter

[Dave Angel]

Bo Morris  Wrote in message:
> 

>
 subprocess.Popen("command") && add 1 to count. If count equals n number, do 
something.

>  I have tried count = 0  count += 1, but count does not seem to be 
> incrementing. 

It would be much better to post the code that "does not seem..."
 There are many possible reasons that count might not seem to
 change.

For example, are you incrementing inside a function and checking
 it elsewhere? If so, look up the keyword global, or make count
 part of the return value.

Please show your code. 

-- 
DaveA

___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor

[Tutor] command counter

[Bo Morris]

I think I figured it out...

each time I run subprocess.Popen("command"), I also have to count += 1,
which adds 1 to count each time the command is run. Is this correct, or is
there a better way?

Thanks
___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor

[Tutor] command counter

[Bo Morris]

how would I keep track of count for each time a command exectuted? for
example...

subprocess.Popen("command") && add 1 to count. If count equals n number, do
something.

I have tried count = 0  count += 1, but count does not seem to be
incrementing.

Thanks
___
Tutor maillist  -  Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor