Take a look at how undefined functions (like Function('f')) work in
sympy/core/function.py (look at UndefinedFunction and all its super
classes and metaclasses).  They are basically dynamically created
classes.

Aaron Meurer

On Thu, Jul 18, 2013 at 11:22 AM, Rick Muller <[email protected]> wrote:
> We could do some metaprogramming like they do to define namedtuple, but I
> don't know whether hacks like that are looked down upon in sympy.
>
>
> On Thursday, July 18, 2013 10:20:06 AM UTC-6, Rick Muller wrote:
>>
>> But I don't know how do define a function that does this, without defining
>> arguments or
>
>
>>
>> modifying the object after creation, both of which I understand are
>> forbidden in sympy operators.
>>
>>
>> Any thoughts?
>
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