Errors with the submit process

solver.py

import subprocess


def solve_it(input_data):
    cmd = "java -jar ./anyint-scala/target/scala-2.12/anyint.jar " + input_data
    p = subprocess.Popen(
        cmd,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        shell=True)
    (out, err) = p.communicate()
    if 0 == p.wait():
        return out
    else:
        return err


if __name__ == '__main__':
    print('This script submits the integer: %s\n' % solve_it('123'))

I'm using sbt-assembly fat jars, and just calling a subprocess. While I don't see any errors when I run this locally, there is an issue with submit.py submission process. Now, if I replace line #5 with

cmd = "java -jar ./anyint-scala/target/scala-2.12/anyint.jar 123"

It works just fine. Which is very strange, given it’s just concatenation. How did you interface to Scala?

Here's my solver.py (though it's from 2014):

#!/usr/bin/python
# -*- coding: utf-8 -*-

import os
from subprocess import Popen, PIPE

def solve_it(input_data):

    # Writes the inputData to a temporay file

    tmp_file_name = 'tmp.data'
    tmp_file = open(tmp_file_name, 'w')
    tmp_file.write(input_data)
    tmp_file.close()

    # Runs the command: java Solver -file=tmp.data

    process = Popen(['java', '-Xmx4g', '-cp', '../target/scala-2.10/optimiziation-assembly-1.0.jar',
        'knapsack.Search', tmp_file_name], stdout=PIPE)
    (stdout, stderr) = process.communicate()

    # removes the temporay file
    os.remove(tmp_file_name)

    return stdout.strip()


import sys

if __name__ == '__main__':
    if len(sys.argv) > 1:
        file_location = sys.argv[1].strip()
        input_data_file = open(file_location, 'r')
        input_data = ''.join(input_data_file.readlines())
        input_data_file.close()
        print solve_it(input_data)
    else:
        print 'This test requires an input file.  Please select one from the data directory. (i.e. python solver.py ./data/ks_4_0)'

@adamw I made the invalid assumption that the input data was supposed to be the input to my answer... it is not...

They use that input data as a general input for all the assignments, and in this case, it's moot. I'm supposed to ignore it, which is why they send an empty string in the example.

Thanks for sharing.