On 6/14/10 5:10 PM, Florent Hivert wrote:
Hi there,
Looking into sage library, I found the following code: file matrix0.pyx
cdef class Matrix(sage.structure.element.Matrix):
...
def __copy__(self):
"""
...
"""
return self.__copy__()
what is the intention here ? I hope this code is never executed ? Why not
return an error ?
Generic matrices have their own __copy__ method (overriding this). I
hope the above code isn't ever executed either.
Here is the result of executing the method, which gives the expected error:
sage: import sage.matrix.matrix0
sage: A = sage.matrix.matrix0.Matrix(MatrixSpace(QQ,2))
sage: type(A)
<type 'sage.matrix.matrix0.Matrix'>
sage: copy(A)
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call last)
/Users/grout/sage-4.4.2-test3/spkg/standard/sagenb-0.8.p3/src/sagenb/<ipython
console> in <module>()
/Users/grout/sage/local/lib/python/copy.pyc in copy(x)
77 copier = getattr(cls, "__copy__", None)
78 if copier:
---> 79 return copier(x)
80
81 reductor = dispatch_table.get(cls)
/Users/grout/sage/local/lib/python2.6/site-packages/sage/matrix/matrix0.so
in sage.matrix.matrix0.Matrix.__copy__ (sage/matrix/matrix0.c:2718)()
[snip]
RuntimeError: maximum recursion depth exceeded while calling a Python object
sage:
So the doctests for that function are useless for testing that function,
obviously.
Jason
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