I have a playgame.cmd file I would like to exceute from within my python code.
It is a genetic algorithm that runs the game (input is individual), waits for the game to run with that individual, then parses data from the game log to output the fitness of that individual.
Inside the .cmd file (shouldn't matter I don't think):
python tools/playgame.py "python MyBot.py" "python tools/sample_bots/python/HunterBot.py"
--map_file tools/maps/example/tutorial1.map --log_dir game_logs --turns 60 --scenario
--food none --player_seed 7 --verbose -e
(This is for the ants AI challenge if you were wondering)
This is all details though. My question is that of the title:
How do I start the script midline in python, wait for the script to finish, then resume the python execution? The script file is in the same folder as the python AntEvolver.py file.
If you want to launch a .cmd file from within a Python script which then launches two more copies of Python within the .cmd, I think you need to slow down, take a step back, and think about how to just get all this stuff to run within one Python interpreter. But, the direct answer to your question is to use os.system() (or the subprocess module, which is also mentioned here):
http://docs.python.org/library/os.html#os.system
A very little snippet:
import subprocess
# do your stuff with sys.argv
subprocess.Popen("python MyBot.py", shell=True).communicate()
# script executed and finished, you can continue...
Related
I have a program that produces a csv file and right at the end I am using os.startfile(fileName) but then due to the program finishing execution the opening file just closes also, same happens if I add a sleep after also, file loads up then once the sleep ends it closes again?
Any help would be appreciated.
From the documentation for os.startfile:
startfile() returns as soon as the associated application is launched. There is no option to wait for the application to close, and no way to retrieve the application’s exit status.
When using this function, there is no way to make your script wait for the program to complete because you have no way of knowing when it is complete. Because the program is being launched as a subprocess of your python script, the program will exit when the python script exits.
Since you don't say in your question exactly what the desired behavior is, I'm going to guess that you want the python script to block until the program finishes execution (as opposed to detaching the subprocess). There are multiple ways to do this.
Use the subprocess module
The subprocess module allows you to make a subprocess call that will not return until the subprocess completes. The exact call you make to launch the subprocess depends heavily on your specific situation, but this is a starting point:
subprocess.Popen(['start', fileName], shell=True)
Use input to allow user to close script
You can have your script block until the user tells the python script that the external program has closed. This probably requires the least modification to your code, but I don't think it's a good solution, as it depends on user input.
os.startfile(fileName)
input('Press enter when external program has completed...')
I want to execute a testrun via bash, if the test needs too much time. So far, I found some good solutions here. But since the command kill does not work properly (when I use it correctly it says it is not used correctly), I decided to solve this problem using python. This is the Execution call I want to monitor:
EXE="C:/program.exe"
FILE="file.tpt"
HOME_DIR="C:/Home"
"$EXE" -vm-Xmx4096M --run build "$HOME_DIR/test/$FILE" "Auslieferung (ML) Execute"
(The opened *.exe starts a testrun which includes some simulink simulation runs - sometimes there are simulink errors - in this case, the execution time of the tests need too long and I want to restart the entire process).
First, I came up with the idea, calling a shell script containing these lines within a subprocess from python:
import subprocess
import time
process = subprocess.Popen('subprocess.sh', shell = True)
time.sleep(10)
process.terminate()
But when I use this, *.terminate() or *.kill() does not close the program I started with the subprocess call.
That´s why I am now trying to implement the entire call in python language. I got the following so far:
import subprocess
file = "somePath/file.tpt"
p = subprocess.Popen(["C:/program.exe", file])
Now I need to know, how to implement the second call "Auslieferung (ML) Execute" of the bash function. This call starts an intern testrun named "Auslieferung (ML) Execute". Any ideas? Or is it better to choose one of the other ways? Or can I get the "kill" option for bash somewhere, somehow?
So this one is a doozie, and a little too specific to find an answer online.
I am writing to a file in C++ and reading that file in Python at the same time to move a robot. Or trying to.
When I try running both programs at the same time, the C++ one runs first and then the Python one runs.
Here's the command I use:
./ColorFollow & python fileToHex.py
This happens even if I switch the order of commands.
Even if I run them in different terminals (which is the same thing, just covering all bases).
Both the Python and C++ code read / write in 'infinite' loops, so these two should run until I say stop.
The code works fine; when the Python script finally runs the robot moves as intended. It's just that the code doesn't run at the same time.
Is there a way to make this happen, or is this impossible?
If you need more information, lemme know, but the code is pretty much what you'd expect it to be.
If you are using Linux, & will release bash session and in this case, CollorFlow and fileToXex.py will run in different bash sessions.
At the same time, composition ./ColorFollow | python fileToHex.py looks interesting, cause you redirect stdout of ColorFollow to fileToHex.py stdin - it can syncronize scripts by printing some code string upon exit, then reading it by fileToHex.py and exit as well.
I would create some empty file like /var/run/ColorFollow.flag and write there 1 when one of processes exit. Not a pipe - cause we do not care which process will start first. So, if next loop step of ColorFollow sees 1 in the file, it deletes it and exits (means that fileToHex already exited). The same - for fileToHex - check flag file each loop step and exit if it exists, after deleting flag file.
I have a script in python (I called it monitor.py), that checks if another python application (called test.py) is running; if true nothing happens; if false it starts test.py.
I am using the subprocess module in monitor.py, but if I start test.py and I close monitor.py , test.py also closes; is there any way to avoid this ? Is this subprocess module the correct one ?
I have a script [...] that checks if another [...] is running
I'm not sure if it's any help in your case, but i just wanted to say that if you're working with Windows, you can program a real service in python.
Doing that from scratch is some effort, but some good people out there provide examples that you can easily change, like this one.
(In this example, look for the line f = open('test.dat', 'w+') and write your code there)
It'll behave like any other windows service, so you can make it start when booting your PC, for example.
I'm writing some code that takes a bunch of text files, runs OpinionFinder on them, then analyses the results. OpinionFinder is a python program that calls a java progam to manage various other programs.
I have:
some code (pull data off the web, write text files)
args = shlex.split('python opinionfinder.py -f doclist')
optout = subprocess.Popen(args)
retcode = optout.wait()
some more code to analyse OpinionFinder's text files.
When I didn't have the optout.wait bit, the subprocess would get executed after the rest of the script had finished, i.e. before the file analysis part. When I added the optout.wait OpinionFinder didn't run properly - I think because it couldn't find the files from the first part of the script - i.e. the order is wrong again.
What am I doing wrong?
What's the best way to run some script, execute an external process, then run the rest of the script?
Thanks.