### Interactive question in notebooks

When trying to find some solution to the double integral problem and poking around with Sage (4.7.2), I stumbled upon this behavior:

```
x,y,u,v,p,k=var('x,y,u,v,p,k')
integrate(x+y^k, y)
```

output (resembles maxima interaction):

```
Traceback (click to the left of this block for traceback)
...
Is k+1 zero or nonzero?
```

How can I answer to this (with nonzero)?

~~Update: ~~**Update**: I accept @god.one solution below as there seems no way as for now to interactively answer those maxima questions.