On Tue, 21 Feb 2006, Guido van Rossum wrote: [...] > If you're only interested in classifying the three specific built-ins > you mention, I'd check for the presense of certain attributes: > hasattr(x, "lower") -> x is a string of some kind; hasattr(x, "sort") > -> x is a list; hasattr(x, "update") -> x is a dict. Also, hasattr(x, > "union") -> x is a set; hasattr(x, "readline") -> x is a file.
dict and set instances both have an .update() method. I guess "keys" or "items" is a better choice for testing dict-ness, if using "LBYL" at all. (anybody new to "LBYL" can google for that and EAFP -- latter does not stand for European Assoc. of Fish Pathologists in this context, though ;-) > That's duck typing! >>> hasattr(python, "quack") True John _______________________________________________ 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
