Your somefunc is sympified as Function('somefunc'), so you could do
somefunc = Function('somefunc')
if expr.func == somefunc:
...
If you want to test for undefined functions generically you can use
from sympy.core.function import UndefinedFunction
if isinstance(expr.func, UndefinedFunction):
...
Aaron Meurer
On Fri, Aug 5, 2022 at 12:40 PM Anton Makarov <[email protected]> wrote:
>
> Hi there.
> I am trying to test the root of expression tree, for example:
> expr = sympify("somefunc(2-5)")
> if expr.func.name =="somefunc":
> call_func_1()
> else:
> call_func_2()
>
> It works just fine, but when I change the expression, for example, to
> expr = sympify("5+6")
>
> Code throws the exception, with error:
> AttributeError: type object 'Add' has no attribute 'name'
>
> I don't understand, why Add class has no attribute "name". Or what attribute
> has all the classes, so I can test the head of any expression without code
> exception?
>
> What code should I write ?
>
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