How to obtain variable values from Python API

[Sakrapee Paisalnun]

Dear KaSim developer team,

 

Currently, I am working with the python interface of KaSim.

 

I am wondering how to get the value of a particular variable by

using this interface.

 

When I use the expression $PRINTF <variable_name> via

simulation_perturbation, no value is returned or printed. (attached files)

 

Is it possible to give me any suggestions or examples about how to obtain

variable values with the python interface in KaSim?

 

Best Regards,

 

Sakrapee Paisalnan

[Yarden Katz]

You can get this information from the "variables" entry in the object returned by "project_parse". Here's a stripped down example based on your file:

import os

import sys

import getopt

import time

import uuid

import kappy

import kappy.kappa_common as kappa_common

import kappy.kappa_std as kappa_std

def main():

    # make simple Kappa model

    model = '''

%agent: A()

%var: 'rate' 0.001

'rule1' A() -> . @ 'rate'

%init: 100 A()

'''

    with open("./model.ka", "w") as file_out:

        file_out.write(model)

    url = os.path.expanduser("~/Software/Kappapp.app/Contents/Resources/bin")

    try:

        runtime = kappa_std.KappaStd(url)

        plot_period = 0.1

        pause_condition = "[T] > 10"

        file_content = ""

        with open("./model.ka", "r") as file_in:

            file_content = file_in.read()

        runtime.add_model_string(file_content)

        kappa_prog = runtime.project_parse()

        print("variables: ")

        for var in kappa_prog["variables"]:

            name, val = var["first"]["val"], var["second"]["val"]

            print("name = %s, value = %s" %(name, str(val)))

    except kappa_common.KappaError as exception:

        print(exception.errors)

    return None

    None

if __name__ == "__main__":

    main()