i am doing some communication between electron.js/node.js and python. i can run a file from python and send a message to it, which is capture via stdin, and that python file can print my message to the electron console. but, this only seems to work if i terminate the program after sending my message in node whereas, i want send the message while the program is running.

var pyshell = new PythonShell('test.py');

pyshell.send(JSON.stringify([1,2,3,4,5]));

pyshell.on('message', function (message) {
    console.log(message);
});

pyshell.end(function (err) {
    if (err){
        throw err;
    };

    console.log('finished');
});

import sys, json

#Read data from stdin
def read_in():
    lines = sys.stdin.readlines()
    return json.loads(lines[0])

def main():

    lines = sys.stdin.readlines()
    lines = json.loads(lines[0])

    total_sum_inArray = 0
    for item in lines:
        total_sum_inArray += item
    print (lines)


main()

my output is [1,2,3,4,5] as it should be, but when i remove pyshell.end listener in the node code, i don't get any output in the console. i'm not sure how sys and stdin exactly work so maybe that's why i cannot figure this out. also, this is my first time asking a question on github so a bit nervous hehe.
thanks for any guidance.