#!/usr/bin/python3
# from: https://www.tutorialspoint.com/python/python_command_line_arguments.htm

import sys, getopt

def main(argv):
	my_prog='getopts.py'

	inputfile = ''
	outputfile = ''

	helptxt = my_prog+' parameter required: [-i][--ifile] <inputfile> [-o][--ofile] <outputfile> for this help:[-h][--help] '

	try:					# short opt : and long opt = means required
		opts, args = getopt.getopt(argv,"hi:o:",["help","ifile=","ofile="])
	except getopt.GetoptError:
		print ('error: ',helptxt)
		sys.exit(2)
	for opt, arg in opts:
		if opt in ('-h','--help'):
			print (helptxt)
			sys.exit()
		elif opt in ('-i', '--ifile'):
			inputfile = arg
		elif opt in ('-o', '--ofile'):
			outputfile = arg
# main
	print ('Input file is ', inputfile)
	print ('Output file is ', outputfile)

# end main
if __name__ == "__main__":
   main(sys.argv[1:])