On 11/07/2011 03:00 PM, William Stein wrote:
> Hi,
>
> Twice in the last day I've hit this deprecation warning due to making
> a stupid typo:
>
> sage: d(N) = (1/2)*(N^2-1)(N^2-N)/(N-1) # contains stupid typo
> /Users/wstein/sage/install/current/local/lib/python2.6/site-packages/IPython/iplib.py:2073:
> DeprecationWarning: Substitution using function-call syntax and
> unnamed arguments is deprecated and will be removed from a future
> release of Sage; you can use named arguments instead, like EXPR(x=...,
> y=...)
> exec code_obj in self.user_global_ns, self.user_ns
>
> I've been trying to get rid of this mistake in symbolic calculus since
> probably 2007. I say we get rid of it soon, e.g., in sage-4.8 (or
> certainly in sage-5.0). It's time for it to go.
>
There's a potential problem with piecewise:
$ ./iterated-2d-solution.py
./iterated-2d-solution.py:85: DeprecationWarning: Substitution using
function-call syntax and unnamed arguments is deprecated and will be
removed from a future release of Sage; you can use named arguments
instead, like EXPR(x=..., y=...)
s_a = this_s(terminal)
"this_s" is a piecewise function of x:
Piecewise defined function with 1 parts, [[(0, 0.500000000000000),
4.00000000000000*(x - 0.500000000000000)^2 - 10.1278345910970*(x -
0.500000000000000)*x + 5.78826325138787*x^2]]
But if you name it explicitly,
TypeError: __call__() got an unexpected keyword argument 'x'
Here's another, where it seems to be complaining about a *python* function:
./w3-double_cubic.py:86: DeprecationWarning: Substitution using
function-call syntax and unnamed arguments is deprecated and will be
removed from a future release of Sage; you can use named arguments
instead, like EXPR(x=..., y=...)
p2 = please_substitute_function(2, domain_points, p2, f, cos(x))
This is defined in another file:
def please_substitute_function(max_degree,
points,
expr,
func1,
func2):
...
Even if I change the call to it in w3-double_cubic.py, I get the same error:
./w3-double_cubic.py:85: DeprecationWarning: Substitution using
function-call syntax and unnamed arguments is deprecated and will be
removed from a future release of Sage; you can use named arguments
instead, like EXPR(x=..., y=...)
p1 = please_substitute_function(max_degree=2,
points=domain_points,
expr=p1,
func1=f,
func2=cos(x))
So please don't trade the warning for an error unless you're sure that
there aren't any false positives (i.e. I'm doing something wrong).
--
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