Hello people, Is there any built-in way to know if an object is a valid dictionary key ? From what I know, the object must be hashable, and from the python doc, an object is hashable if it has the __hash__ and (__cmp__ or __eq__) methods.
http://docs.python.org/2/glossary.html#term-hashable I found this on the net, but considering the above definition, does it really check the cmp/eq existence ? def ishashable(x): try: hash(x) except TypeError: return False else: return True I was trying to know if any custom class can be used as a dict key. It looks like you can. Yet I'm a little bit concerned, because last time I used invalid objects as keys, I got a bug that was really difficult to spot. Regards, JM -- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. -- http://mail.python.org/mailman/listinfo/python-list
