[Python-Dev] PEP 362 Third Revision (original) (raw)

Larry Hastings larry at hastings.org
Fri Jun 15 20:17:09 CEST 2012

On 06/15/2012 04:32 AM, Nick Coghlan wrote:

Since I don't believe your proposed flag will answer any question that actually matters in practice, I consider it useless noise that should be dropped from the proposal.

I can cite a situation where it matters in practice: the implementation of os.fwalk is effectively gated on hasattr(posix, "openat"). I expect to remove openat() in favor of adding a dir_fd parameter to open (see issue 14626).

Now, what a function could do is set signature to a Signature subclass that provided an additional "validate()" method, or provided arbitrary additional information about supported features. That's a perfectly reasonable option.

What would the validate() function for os.close do?

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