Georg Brandl wrote: > Aaron Bingham schrieb: > >> Georg Brandl wrote: >> >>> Greg Ewing schrieb: >>> >>> >>>> Scott Dial wrote: >>>> >>>> A tangential question -- why are TemporaryFile and >>>> NamedTemporaryFile named in TitleCase, when they're >>>> functions and not classes? >>>> >>>> >>> Probably because they are factory functions potentially returning a >>> _TemporaryFileWrapper. If they were "functions", they'd have to be >>> verbed, e.g. "make_temporary_file()". >>> >>> The class/function distinction is not so clear in Python from the user's >>> point of view since there is no different calling syntax. >>> >> Actually the distinction is very clear: >> >> >>> class _PrivateClass(object): >> ... pass >> ... >> >>> def FunctionNamedToLookLikeClass(): >> ... return _PrivateClass() >> ... >> >>> pc = _PrivateClass() >> >>> isinstance(pc, _PrivateClass) >> True >> >>> fntllc = FunctionNamedToLookLikeClass() >> >>> isinstance(fntllc, FunctionNamedToLookLikeClass) >> Traceback (most recent call last): >> File "<stdin>", line 1, in <module> >> TypeError: isinstance() arg 2 must be a class, type, or tuple of classes >> and types >> >> That's sure to be an unpleasant surprise for someone. >> > > <whisper>duck typing...</whisper> > > But you have a valid point. > Sure, isinstance was only meant as an example. Anything that expects FunctionNamedToLookLikeClass to exhibit class-like behaviors beyond a call returning a new instance will fail.
-- Aaron Bingham Senior Software Engineer [EMAIL PROTECTED] Tel. +49 (0)351 4173-146 Fax +49 (0)351 4173-109 Cenix BioScience GmbH Tatzberg 47 01307 Dresden, Germany www.cenix-bioscience.com --------------------------------------------------------- Sitz der Gesellschaft (Place of Business): Dresden Geschäftsführer (CEO): Dr. Christophe J. Echeverri Amtsgericht (Local Court): Dresden, HRB 19964 Ust-ID (VAT-No.): DE205824437 --------------------------------------------------------- _______________________________________________ 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
