port-range
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port-range
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	#!/usr/bin/python3

	import sys
	import re

	def error(port_range):
	print(f'Error: {port_range} is not a valid port or port range')
	sys.exit(1)

	if __name__ == '__main__':
	if len(sys.argv)>1:
	port_range = sys.argv[1]
	if re.match('^[0-9]{1,5}-[0-9]{1,5}$', port_range):
	port_1, port_2 = port_range.split('-')
	if int(port_1) not in range(1, 65536) or int(port_2) not in range(1, 65536):
	error(port_range)
	if int(port_1) > int(port_2):
	error(port_range)
	elif not port_range.isnumeric() or int(port_range) not in range(1, 65536):
	error(port_range)
	else:
	sys.exit(2)

	sys.exit(0)