>>> import hostport
>>> hostport.parse('host:30')
HostPort(host='host', port=30)
>>> hostport.parse('host:30').host
'host'
>>> hostport.parse('host:30').port
30
>>> hostport.parse('[fe80::95f3]:50051')
HostPort(host='[fe80::95f3]', port=50051)
>>> hostport.parse('[fe80::95f3]')
HostPort(host='[fe80::95f3]', port=None)
>>> hostport.parse('host', default_port=30)
HostPort(host='host', port=30)
>>> hostport.parse('30', default_host='host')
HostPort(host='host', port=30)
>>> hostport.parse('host.production:50051', default_host='host', default_port=30)
HostPort(host='host.production', port=50051)
>>> hostport.parse('host.production')
HostPort(host='host.production', port=None)
>>> hostport.parse('50051')
HostPort(host=None, port=50051)