Taking Frédéric's advice to heart, I have begun porting SnapPy to
Sage+Python3. (We have supported Python 3 outside of Sage for a few years
now.) Right now, I am having difficulty with how to register something as
a field. Below is the minimal (non) working example: if you run it with
Python 2 it will print "True", but with Python 3 you get "False".
Suggestions?
Thanks, Nathan
---------
import sage.all
from sage.structure.parent import Parent
from sage.structure.unique_representation import UniqueRepresentation
from sage.categories.fields import Fields
from sage.misc.classcall_metaclass import ClasscallMetaclass
class SnappyNumbersMetaclass(ClasscallMetaclass):
"""
Metaclass for Sage parents of SnapPy Number objects.
"""
def __new__(mcs, name, bases, dict):
dict['category'] = lambda self : Fields()
return ClasscallMetaclass.__new__(mcs, name, bases, dict)
class SnapPyNumbers(UniqueRepresentation, Parent):
"""
Sage parents of SnapPy Number objects.
"""
__metaclass__ = SnappyNumbersMetaclass
def __init__(self, precision):
Parent.__init__(self)
self._precision = precision
SPN = SnapPyNumbers(53)
print(SPN in Fields)
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