-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 01/16/2014 04:08 PM, Ryan Smith-Roberts wrote:
> [L]et us return to my original example, getservbyname(). Its current > signature: > > socket.getservbyname(servicename[, protocolname]) > > This is not an inspectable signature, since pure Python does not > support bracketed arguments. To make it inspectable, we must give > protocolname a (valid Python) default value: > > socket.getservbyname(servicename, protocolname=None) > > Unfortunately, while useful and inspectable, this signature is not > correct. For a pure Python function, passing None for protocolname is > the same as omitting it. However, if you pass None to getservbyname(), > it raises a TypeError. So, we have these three options: > > 1) Don't give getservbyname() an inspectable signature. 2) Lie to the > user about the acceptability of None. 3) Alter the semantics of > getservbyname() to treat None as equivalent to omitting protocolname. > > Obviously #2 is out. My question: is #3 ever acceptable? It's a real > change, as it breaks any code that relies on the TypeError exception. +1 for #3, especially in a new "major" release (w/ sufficient documentation of the change). Tres. - -- =================================================================== Tres Seaver +1 540-429-0999 tsea...@palladion.com Palladion Software "Excellence by Design" http://palladion.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iEYEARECAAYFAlLYWU8ACgkQ+gerLs4ltQ6obQCglHmIM4kcNOQte7jj9NjL6Xia KQwAn2ircAlSR6iwFIAt6PDz0bs6iIDt =G+GC -----END PGP SIGNATURE----- _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
