old_contents: #!/usr/bin/env python3
  
  import argparse
  import datetime
  import multiprocessing
  import os
  import subprocess
  import sys
  import time
  
  def main():
  	#Parse arguments
  	parser = argparse.ArgumentParser(description='Parallize helper script.')
  	parser.add_argument('run_script', help='Find to do comments.')
  	parser.add_argument('run_id', help='A unique identifier for the run')
  	parser.add_argument('configs', nargs='*', help='A set of configurations to run.')
  	arguments = parser.parse_args(sys.argv[1:])
  
  	maxProcesses = multiprocessing.cpu_count()
  
  	startTime = datetime.datetime.now()
  	print('[%s] Starting %d processes for %d configs' % (startTime, maxProcesses, len(arguments.configs)))
  
  	#Start processes
  	processes = {}
  	for i, config in enumerate(arguments.configs):
  		#Wait for a CPU to become available
  		while len(processes) >= maxProcesses:
  			time.sleep(5)
  
  			#Check for finished processes
  			finishedConfigs = []
  			for runningConfig, process in processes.items():
  				returnCode = process.poll()
  				if returnCode is not None:
  					if returnCode != 0:
  						sys.stdout.write('[%s] Config %s failed with return code %d' % (datetime.datetime.now(), runningConfig, returnCode))
  						sys.stdout.flush()
  
  					finishedConfigs.append(runningConfig)
  
  			for finishedConfig in finishedConfigs:
  				del processes[finishedConfig]
  
  		sys.stdout.write('[%s] Starting %.4d/%.4d (%5.1f%%)\n' % (datetime.datetime.now(), i + 1, len(arguments.configs), 100.0 * (i + 1) / len(arguments.configs)))
  		sys.stdout.flush()
  
  		process = subprocess.Popen([arguments.run_script, arguments.run_id, config], shell=False)
  		processes[config] = process
  
  	#Wait for processes to finish
  	for process in processes.values():
  		process.wait()
  
  	endTime = datetime.datetime.now()
  	print('[%s] Finished in %.2f seconds' % (endTime, (endTime - startTime).total_seconds()))
  
  	return 0
  
  if __name__ == '__main__':
  	sys.exit(main())
  
new_contents: #!/usr/bin/env python3
  
  import argparse
  import datetime
  import multiprocessing
  import subprocess
  import sys
  import time
  
  def main():
  	#Parse arguments
  	parser = argparse.ArgumentParser(description='Parallize helper script.')
  	parser.add_argument('run_script', help='Find to do comments.')
  	parser.add_argument('run_id', help='A unique identifier for the run')
  	parser.add_argument('configs', nargs='*', help='A set of configurations to run.')
  	arguments = parser.parse_args(sys.argv[1:])
  
  	maxProcesses = multiprocessing.cpu_count()
  
  	startTime = datetime.datetime.now()
  	print('[%s] Starting %d processes for %d configs' % (startTime, maxProcesses, len(arguments.configs)))
  
  	#Start processes
  	processes = {}
  	for i, config in enumerate(arguments.configs):
  		#Wait for a CPU to become available
  		while len(processes) >= maxProcesses:
  			time.sleep(5)
  
  			#Check for finished processes
  			finishedConfigs = []
  			for runningConfig, process in processes.items():
  				returnCode = process.poll()
  				if returnCode is not None:
  					if returnCode != 0:
  						sys.stdout.write('[%s] Config %s failed with return code %d' % (datetime.datetime.now(), runningConfig, returnCode))
  						sys.stdout.flush()
  
  					finishedConfigs.append(runningConfig)
  
  			for finishedConfig in finishedConfigs:
  				del processes[finishedConfig]
  
  		sys.stdout.write('[%s] Starting %.4d/%.4d (%5.1f%%)\n' % (datetime.datetime.now(), i + 1, len(arguments.configs), 100.0 * (i + 1) / len(arguments.configs)))
  		sys.stdout.flush()
  
  		process = subprocess.Popen([arguments.run_script, arguments.run_id, config], shell=False)
  		processes[config] = process
  
  	#Wait for processes to finish
  	for process in processes.values():
  		process.wait()
  
  	endTime = datetime.datetime.now()
  	print('[%s] Finished in %.2f seconds' % (endTime, (endTime - startTime).total_seconds()))
  
  	return 0
  
  if __name__ == '__main__':
  	sys.exit(main())
  
subject: Remove unused import