[Python-Dev] PEP 3144 review. (original) (raw)

R. David Murray rdmurray at bitdance.com
Thu Sep 17 14:58:08 CEST 2009

On Wed, 16 Sep 2009 at 20:26, Peter Moody wrote:

On Wed, Sep 16, 2009 at 7:48 PM, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:

I'm not sure what usefulness the zero address on its own has, but if it's considered useful enough to have an attribute for it, calling it something like 'baseaddress' would be less confusing. the address with all of the hosts bits masked to zero is most commonly referred to as the network address. same as the address with all of the host bits set to one is called the broadcast address. calling it something like baseaddress or minaddress will cause quite a bit more confusion.

If 'network address' is the most common designation for this number (and it may well be), then 'network.address' and 'network.broadcast' would seem to be the best choices for names. But there is definitely an attraction to the idea (I think it was Nick's?) of dropping these attributes entirely and just using indexing to get the addresses. That will make perfect sense to network professionals, and by putting appropriate words in the documentation will educate people new to IP addressing concepts. The advantage is that it is completely unambiguous: the network address really is the first address in the network range, and the broadcast really is the last, in common usage. Exceptional cases can then be handled by custom subclasses, without having someone who has to handle weird broadcast addresses (for example) submitting a bug request to make '.broadcast' settable.

--David

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