On 2012-06-14, at 12:03 PM, Ethan Furman wrote: > Yury Selivanov wrote: >> Hello, >> The new revision of PEP 362 has been posted: >> http://www.python.org/dev/peps/pep-0362/ >> It's possible to test Signatures for equality. Two signatures >> are equal when they have equal parameters and return annotations. > > Possibly a dumb question, but do the parameter names have to be the same to > compare equal? If yes, is there an easy way to compare two signatures by > annotations alone?
Yes, parameter names have be the same. You need to write a custom compare function for Parameters, that will check that two have (or both don't) equal annotations and *kinds*, and then write a compare function for Signatures, that will test return_annotations and 'parameters' collections. All in all, shouldn't be longer than 10-15 lines of code. Another "solution" to the problem could be adding a new 'annotations' read-only dynamic property to the Signature, that would iterate through parameters and produce a single dict. But this solution has a serious flaw, as signature of: def foo(a:int, *, b:int) -> float is not equal to the signature of: def bar(a:int, b:int) -> float and certainly not the signature of: def spam(*args:int, **kwargs:int) -> float So the most correct approach here is the one I described in the first place. Thanks, - Yury _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
