Quoting Steven Trogdon <strogdon@...>:

> On Fri, 27 Jan 2012 01:04:03 +0200
> v_2e@... wrote:
>
>>   Hello!
>>
>> On Thu, 26 Jan 2012 11:19:14 -0600
>> Steven Trogdon <strogdon@...> wrote:
>>
>> > Hi Vladimir,
>> > > You could try:
>> > > https://github.com/cschwan/sage-on-gentoo/issues/93
>> > > In the issue there was an IPython-0.10.1-py-2.7.egg-info file that
>> > was floating around. However, if this fixes things, it's odd that
>> > it's appearing again with 4.8, unless your ipython was recently
>> > upgraded?
>> >   Yes, I saw that discussion and tried to apply the solution suggested
>> there before posting to this list. In my case I didn't find a file with
>> such name there.
>>   And by the way I upgraded the IPython to the version 0.12-r1 on
>> January 23. Could it be because of the recent upgrade?
>>
>>   Thanks.
>>     Vladimir
>>
>> -----  <v_2e@...>
>>
> Hi Vladimir,
>
> ipython-0.12-r1 breaks things here with the same error you get.
> There is no problem with ipython-0.10.2.
>
Hi,

I was warned on the sage-devel mailing list that ipython-0.11+ would break
things by one of the ipython lead developers. He wanted feedback on what would
happen with sage with newer ipython. I never got around to give him an answer
back because the ipython bump lagged in Gentoo. So I think we will 
restrict the
ipython version to 0.10.2 for the time being in sage.

Francois