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Do not create an useless list since set
can be created from any iterable.
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@ -284,7 +284,7 @@ class Switch(AclMixin, Machine):
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if end < begin:
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raise ValidationError(_("The end port is less than the start"
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" port."))
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ports_to_create = list(range(begin, end + 1))
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ports_to_create = range(begin, end + 1)
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existing_ports = Port.objects.filter(switch=self.switch).values_list('port', flat=True)
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non_existing_ports = list(set(ports_to_create) - set(existing_ports))
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