problem execute a python script

[GammaLyra]

hi!
I am trying to run a python script in Anylogic using the Pypeline. In the script (.py) there is a function with two input variables, that returns me a value. I want to obtain this variable in Anylogic. I have done it in the following way:

pyCommunicator.run("import name_script");

String dia_st = String.valueOf(dia);
String mes_st = String.valueOf(mes);

Attempt attempt = pyCommunicator.runFile("name_script.name_func", dia_st,mes_st);

When I execute the simulation in Anylogic, I obtain this message: "[Errno 2] No such file or directory". The script is in the same folder that the simulation...

Thanks for everything!

Best regards

[fabricio-fn]

the error is happening because the system cannot find the Python file path.

make sure you used the .p extension (file.py)
If that doesn't work, try using the absolute path.

or it may be that the other file needs to be exported

[GammaLyra]

I've already got it working. as follows:

in my script in Python:

"import argparse

if name == "main":
parser = argparse.ArgumentParser()
parser.add_argument("dia", type=int)
parser.add_argument("mes", type=int)
args = parser.parse_args()
dia=args.dia
mes=args.mes
a=prediccion(dia,mes)"

And I do the call in Anylogig like this:

"String dia_st = String.valueOf(dia);
String mes_st = String.valueOf(mes);
Attempt attempt = pyCommunicator.runFile("pred_xgboost.py", dia_st,mes_st);"

However, my python function "prediccion(dia,mes)", have a output variable that I need to use in Anylogic. How can i access it?

Thanks for everything!

[t-wolfeadam]

The only thing you're missing here is to convert the Attempt object to the intended data type. I'll assume the type is a double; there's two ways to do it depending on your preference:

With your existing style:

// ...other code...
Attempt attempt = pyCommunicator.runFile("pred_xgboost.py", dia_st,mes_st);
double myValue = attempt.getFeedback(double.class);

Or using the shortcut (skipping the Attempt object):

// ...other code...
double myValue = pyCommunicator.runFile(double.class, "pred_xgboost.py", dia_st, mes_st);

Also, I just realized runFile is not documented in the wiki! I'll put that on my todo 😅

[fabricio-fn]

try using the "subprocess" module

import argparse

def prediction(day, month):
# Perform necessary processing to obtain the result
result = "Your result here"
return result

if name == "main":
parser = argparse.ArgumentParser()
parser.add_argument("day", type=int)
parser.add_argument("month", type=int)
args = parser.parse_args()
day = args.day
month = args.month
prediction_result = prediction(day, month)
print(prediction_result) # Print the result to be captured by AnyLogic

String day_st = String.valueOf(day);
String month_st = String.valueOf(month);
String result = "";

try {
Process process = Runtime.getRuntime().exec("python pred_xgboost.py " + day_st + " " + month_st);
BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
result = reader.readLine(); // Capture the first output line (result) from Python
process.waitFor(); // Wait until the Python process finishes
} catch (IOException | InterruptedException e) {
e.printStackTrace();
}

[t-wolfeadam]

Fortunately, this route is unnecessary, as it's exactly the type of thing that Pypeline as a whole (and specifically runFile) is intended to serve as an abstraction away from!

Also, to avoid potential confusion in the future, you may wish to encapsulate code blocks in triple brackets, and can add syntax highlighting (github help doc ref).

[t-wolfeadam]

The problem is that runFile is only intended for non-interactive execution of scripts whereas run and runResults are interactive. Because you imported the file with run, you want to use runResults instead of runFile; you also don't need to convert them to (Java) string first, as the function will handle that for you.

Attempt attempt = pyCommunicator.runResults("name_script.name_func(%s, %s)", dia, mes);

Note that if name_func is expecting those values as (Python) strings, you'll need to put single quotes around the string formatters (%s). (I noticed your other comment shows it's expecting integers, so the code above is valid)

[GammaLyra]

Thank you very much for the solution and the quick response! it works for me :) I hadn't understand well and thought that the iterative command was runFile...

Thanks for everything!