Joel Hedlund wrote:
>> There's no requirement that the socket module or
>> anything else return values using the same object that the
>> socket.AF_UNIX constant uses.
>
>
> Ouch. That's certainly an eyeopener.
>
> For me, this means several things, and I'd really like to hear people's
> thoughts about them.
>
> It basically boils down to "don't ever use 'is' unless pushed into a
> corner, and nevermind what PEP8 says about it".
Identity checks are often used for checking input parameters of a function:
def somefunc(val=None):
if val is None:
val = []
do_stuff(val)
Or if None is a possible parameter you can use your own object as a marker::
_marker = []
def somefunc(val=_marker):
if val is marker:
val = []
do_stuff(val)
--
hilsen/regards Max M, Denmark
http://www.mxm.dk/
IT's Mad Science
Phone: +45 66 11 84 94
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