On Oct 9, 2008, at 12:44 PM, Martin Albrecht wrote:
> On Thursday 09 October 2008, Robert Bradshaw wrote:
>> self can be either the first or second argument of an arithmetic
>> operator for an extension class (this is just how Python works).
>> Usually we don't have to worry about that in Sage as the coercion
>> model makes sure that both are of the same type (or at least same
>> parent) before user code gets called.
>
> Hi Robert,
>
> I understand that argument in the context of say multiplication but
> for
> __pow__ you can't switch the parameters around (?)
Python does...
{{{
%cython
cdef class MyClass:
def __pow__(base, exp, dummy):
print "base", base, "exp", exp
def __str__(self):
return "MyClass"
///
}}}
sage: a = MyClass()
sage: a^5
base MyClass exp 5
sage: "foo"^a
base foo exp MyClass
Strange but true.
- Robert
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