Dear Jason,
> Okay, how about this:
>
> class inline_operator:
You probably mean :
class infix_operator:
...
"infix" remember "infix" :)
> # EXAMPLE
>
> a=[1,2,3]
> b=[3,4,5]
>
> @inline_operator
> def emul(a,b):
> return [i*j for i,j in zip(a,b)]
>
> # Returns [3,8,15]
> a *emul* b
Another suggestion: It allows also to define prefix postfix operator by
partial specialization::
sage: bla = emul*[1,2,3]
sage: [4,5,6]*bla
[4, 10, 18]
sage: bla = [1,2,3]*emul
sage: bla*[4,5,6]
[4, 10, 18]
which looks perfectly good to me. However I'd rather having an error it the
following two behavior::
sage: bla = emul*[1,2,3]*[1,2,4]
sage: [4,5,6]*bla
[4, 10, 24]
sage: bla = [1,2,4]*emul
sage: [1,1,1]*bla*[1,1,1]
[1, 1, 1]
That is when left or right are not None, multiplying raise an error instead of
replacing them silently::
def __rmul__(self, left):
if self.right is None:
if self.left is None:
return inline_operator(self.function, left=left)
else:
raise SyntaxError, "Infix operator already has its left
argument"
else:
return self.function(left, self.right)
def __mul__(self, right):
if self.left is None:
if self.right is None:
return inline_operator(self.function, right=right)
else:
raise SyntaxError, "Infix operator already has its right
argument"
else:
return self.function(self.left, right)
What do you think ?
Florent
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