Hello,
When I am using Sage from the command line on my own PC (SageMath version
7.2, Release Date: 2016-05-15) I can do:
sage: class myint(SageObject):
....: def __init__(self, n):
....: self.value = n
....:
sage: p = myint(3)
sage: save(p,'p')
sage: q = load('p')
sage: print q.value
3
sage: help(p)
Help on myint in module __main__ object:
class myint(sage.structure.sage_object.SageObject)
| Method resolution order:
| myint
| sage.structure.sage_object.SageObject
| __builtin__.object
...
If I try to do the same in a SageMathCloud worksheet:
https://cloud.sagemath.com/projects/80f4c9e7-8a37-4f59-82e7-aa179ec0b652/files/public/save_bug_example.sagews
I see:
class myint(SageObject):
def __init__(self, n):
self.value = n
p = myint(3)
save(p,'p')
---
Error in lines 5-5
Traceback (most recent call last):
File
"/projects/sage/sage-7.3/local/lib/python2.7/site-packages/smc_sagews/sage_server.py",
line 957, in execute
exec compile(block+'\n', '', 'single') in namespace, locals
File "", line 1, in <module>
File "sage/structure/sage_object.pyx", line 1076, in
sage.structure.sage_object.save
(/projects/sage/sage-7.3/src/build/cythonized/sage/structure/sage_object.c:11864)
obj.save(filename=filename, compress=compress, **kwds)
File "sage/structure/sage_object.pyx", line 439, in
sage.structure.sage_object.SageObject.save
(/projects/sage/sage-7.3/src/build/cythonized/sage/structure/sage_object.c:3410)
open(filename, 'wb').write(self.dumps(compress))
File "sage/structure/sage_object.pyx", line 463, in
sage.structure.sage_object.SageObject.dumps
(/projects/sage/sage-7.3/src/build/cythonized/sage/structure/sage_object.c:3701)
s = cPickle.dumps(self, protocol=2)
PicklingError: Can't pickle <class 'myint'>: attribute lookup __builtin__.myint
failed
---
help(p)
---
Help on myint in module __builtin__ object:
class myint(sage.structure.sage_object.SageObject)
| Method resolution order:
| myint
| sage.structure.sage_object.SageObject
| object
|
Why are the module and the method resolution order different between Sage
and SageMathCloud worksheet?
In a SageMathCloud worksheet, how do I save an instance of a user defined
class?
All the best, Paul
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