Problem of Sage 9.0 and Maxima powerseries

[mendes]

Dear all,

In previous versions of Sagemath, this worked fine:

f= 1/(1-x)

print( maxima(f,x).powerseries(x,0) )

Now, in Sage 9.0, this raises  the error:

TypeError: new_name must be a string

I would be very grateful for any help.

[Vincent Delecroix]

What is this syntax maxima(f, x) intended for? Just use

sage: maxima(f).powerseries(x,0)
'sum(_SAGE_VAR_x^i3,i3,0,inf)

I hardly understand why it worked in previous versions.

[luis mendes]

Thank you very much Vincent !!!

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[Dima Pasechnik]

On Tue, Mar 24, 2020 at 9:13 PM mendes <mend...@gmail.com> wrote:
>
> Dear all,
>
> In previous versions of Sagemath, this worked fine:
>
> f= 1/(1-x)
> print( maxima(f,x).powerseries(x,0) )
>
> Now, in Sage 9.0, this raises the error:
>
> TypeError: new_name must be a string

is there any reason you cannot simply do

sage: f= 1/(1-x)
sage: f.series(x)
1 + 1*x + 1*x^2 + 1*x^3 + 1*x^4 + 1*x^5 + 1*x^6 + 1*x^7 + 1*x^8 +
1*x^9 + 1*x^10 + 1*x^11 + 1*x^12 + 1*x^13 + 1*x^14 + 1*x^15 + 1*x^16 +
1*x^17 + 1*x^18 + 1*x^19 + Order(x^20)

>
>
> I would be very grateful for any help.
>

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