Hi Maarten, On 11 Sep., 21:12, Maarten Derickx <m.derickx.stud...@gmail.com> wrote: > can you check wether type(MyPolyRing).__reduce__() is actually called?
It isn't. I am currently trying to understand the "pickle" module. I already found that it there is a special case when type(obj) is a subclass of types.TypeType. That is the case here. However, it is also the case of obj=QQ['x'].__class__: type(obj) is <class 'sage.structure.dynamic_class.DynamicMetaclass'>, and that's a subclass of type. Hence, I don't understand why dynamic classes such as QQ['x'].__class__ can be pickled, but my class can't. Another detail, perhaps it is relevant. My metaclass is a dynamic class and thus has a metaclass as well: sage: type(type(MyPolyRing)) <class 'sage.structure.dynamic_class.DynamicMetaclass'> Is there any restriction on metaclasses? That would be very surprising for me, though. Shouldn't all be fine, if type(type(type(... (type(obj))...))) arives at <type 'type'> after a finite number of steps? Best regards, Simon -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
