#11791: Introspection for interactively defined classes with metaclass
---------------------------+------------------------------------------------
Reporter: SimonKing | Owner: jason
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.7.2
Component: misc | Keywords: introspection, cython, dynamic
metaclass
Work_issues: | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies: #11298, #11768, #11734
---------------------------+------------------------------------------------
Changes (by SimonKing):
* status: new => needs_review
Comment:
The attached patch seems to solve the problem. From the doctests:
{{{
sage: cython_code = [
... 'from sage.structure.dynamic_class import dynamic_class',
... 'from sage.all import cached_function',
... 'MyMetaclass =
dynamic_class("MyMetaclass",(ClasscallMetaclass,))',
... 'class Bar2:',
... ' __metaclass__ = MyMetaclass',
... ' @cached_function',
... ' def __classcall__(cls, R):',
... ' return type.__call__(cls, R)',
... ' def __init__(self,R):',
... ' self.R = R',
... ' def __repr__(self):',
... ' return "[%s]"%self.R',
... ' def __hash__(self):',
... ' print "computing the hash"',
... ' return int(12345)']
sage: cython('\n'.join(cython_code))
sage: print ''.join(sage_getsourcelines(Bar2)[0])
class Bar2:
__metaclass__ = MyMetaclass
@cached_function
def __classcall__(cls, R):
return type.__call__(cls, R)
def __init__(self,R):
self.R = R
def __repr__(self):
return "[%s]"%self.R
def __hash__(self):
print "computing the hash"
return int(12345)
}}}
The tests of `sage.misc.sageinspect` pass with the patch. I did not try
full tests yet, but I think it could already be reviewed.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11791#comment:1>
Sage <http://www.sagemath.org>
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