On 9/4/10 1:35 AM, ross kyprianou wrote:
Thanks guys
exp, log, sqrt etc covers well over 50% of the requirement so Im really
ahead - Once again - THANKS!
It seems functional.py is definitely the place to be looking at. Whats
needed is a "catch-all/anonymous" function in functional.py so that
X.myfunction() is "try'ed" whenever myfunction(X) is called (much like
exp(X) invokes X.exp() in functional.py)
(can lambda functions or __call__ help here?)
Anyone have any ideas what mechanism might do that?
Are you suggesting something like:
http://www.sagemath.com/doc/reference/sagenb/misc/support.html#sagenb.misc.support.automatic_names
which takes any function foo(bar, ...) and tries to call bar.foo(...)?
I think there are good reasons that automatic_names is off by default.
If I mistype a function name, for example, I want to know about it,
rather than it trying to magically call a method.
Another thing that would clean up the code in misc/functional.py is a
decorator for trying the method first. For example:
def try_method_first(f):
from misc import sage_wraps
@sage_wraps(f)
def new_f(x,*args,**kwds):
if hasattr(x,f.func_name):
return getattr(x,f.func_name)(*args,**kwds)
else:
return f(x,*args,**kwds)
return new_f
Then we could write code something like this:
sage: from sage.misc.decorators import try_method_first
sage: @try_method_first
....: def my_new_function(x,a,b=2):
....: print "in function", x, a, b
....:
sage: class my_specialized_object:
....: def my_new_function(*args,**kwds):
....: print "in class's specialized method", args, kwds
....:
sage: my_new_function(2,3)
in function 2 3 2
sage: C=my_specialized_object()
sage: my_new_function(C,3)
in class's specialized method (<__main__.my_specialized_object instance
at 0x10045a908>, 3) {}
Notice that it called the method if it existed, but otherwise did
whatever the function normally does.
Thanks,
Jason
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