I agree it should be an error. SymPy is getting better at checking types of
inputs, but in general, you can expect a garbage in, garbage out behavior.
Aaron Meurer
On Sat, Feb 6, 2021 at 5:07 PM David Bailey <d...@dbailey.co.uk> wrote:
> Dear Group,
>
> While thinking about Jonathon's question, I came across this oddity:
>
> x=symbols('x')
>
> f=symbols('f',cls=Function)
>
> diff(f,x)
>
> 1
>
> Why 1? I think I would have expected it to generate a TypeError, just like
> f+x does.
>
> David
>
>
>
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