Re: [Py4j-users] Using copy.deepcopy() with Java Objects

[Barthelemy D. <ba...@cs...>]

Hi Nicolò,

as Alex says, it is not possible to use deepcopy with a Java object in 
Python and I'm not sure it makes sense anyway. Are you trying to 
dynamically duplicate a Java object graph from Python or...?

With more information about what you are trying to do, we may be able to 
find an alternative.

Barthélémy

On 03/16/2011 06:50 AM, Alex Grönholm wrote:
> 16.03.2011 12:24, Nicolò Perino kirjoitti:
>> Hi,
>> I was experimenting with your library P4JS and I was wandering how to create a copy of a Java object in Python environment. So I tried with the Python copy module, starting from your "stack" example:
>>
>>>>> stack = gateway.entry_point.getStack()
>>>>> stack
>> JavaObject id=o0
>>>>> import copy
>>>>> a = copy.deepcopy(stack)
>> Traceback (most recent call last):
>>     File "<stdin>", line 1, in<module>
>>     File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/copy.py", line 173, in deepcopy
>>       y = copier(memo)
>>     File "/Library/Python/2.6/site-packages/py4j/java_gateway.py", line 343, in __call__
>>       args_command = ''.join([get_command_part(arg, self.pool) for arg in new_args])
>>     File "/Library/Python/2.6/site-packages/py4j/protocol.py", line 208, in get_command_part
>>       command_part = REFERENCE_TYPE + parameter._get_object_id()
>> AttributeError: 'dict' object has no attribute '_get_object_id'
>>
>> Is there a way to success in coping objects?
> You'll have to do it on the Java side. The exact method depends on what
> type you are trying to copy.
>> Thank you.
>> Bye
>>
>>
>> Nicolò Perino
>> ______
>> PhD Student @ USI - Faculty of Informatics
>> http://www.people.usi.ch/perinon/
>>
>>
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