deepcopy raises TypeError for method/function?

[OKB (not okblacke)]

Alex Martelli wrote:

>>       Does anyone have any pointers on this?  It seems that
>>       certain types 
>> are safe to deepcopy (even if they're not actually copied) whereas
>> others are not.  Do I just have to manually typecheck for
>> functions and methods?  Are there any other types that might raise
>> such an error? 
> 
> You can use copy_reg to register an identity function as the way to
> 'copy' function and methods, if that floats your boat.  And sure,
> there are other types that raise errors, imagine copying a file
> object, a socket, ...!

    	Wasn't someone just saying on another thread, though, that copy 
doesn't "officially" use copy_reg?

    	Anyway, I guess my real question is, is there any safe way to do 
something like

for a in someList:
    	b = copy.deepcopy(a)

    	. . . without having to know ahead of time what kinds of objects 
are in someList?  I could maybe use try/except to catch failure, but if 
deepcopy fails like it did with methods, will it always throw a 
TypeError, or might it raise some other kind of error?  Alternatively, 
is there a way to tell without actually attempting the deepcopy whether 
it will be able to copy the object or not?

-- 
--OKB (not okblacke)
Brendan Barnwell
"Do not follow where the path may lead.  Go, instead, where there is
no path, and leave a trail."
	--author unknown