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#!/usr/bin/env python3
from ipaddress import IPv6Address
from sys import argv, exit
if __name__ == '__main__':
if len(argv) > 1:
# try to pass validation and raise an error if failed
try:
ipv6_range = argv[1]
range_left = ipv6_range.split('-')[0]
range_right = ipv6_range.split('-')[1]
if not IPv6Address(range_left) < IPv6Address(range_right):
raise ValueError(f'left element {range_left} must be less than right element {range_right}')
except Exception as err:
print(f'Error: {ipv6_range} is not a valid IPv6 range: {err}')
exit(1)
else:
print('Error: an IPv6 range argument must be provided')
exit(1)
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