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:

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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 -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.