This seems to be a very weird behavior. After modifying a file, all
instantiated instances V of classes C in the file are no longer correct
(i.e. instance(V,C) returns false).
Here's a simple example illustrating the problem
I have a file called t1.py contains the following
class Test(object):
def __init__(self):
pass
Now open sage, at the prompt do
$ sage
----------------------------------------------------------------------
| Sage Version 4.8, Release Date: 2012-01-20 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: attach t1.py
sage: t = Test()
sage: isinstance(t,Test)
True #### here it's correct
Now go back to the file t1.py, make any modification , e.g. enter a
space and delete it ... save the file
sage: isinstance(t,Test)
False #### here it's no longer correct
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