[gentoo-user] How can I upgrade my python version?

[haoniukun]

Dear all,
 
I've just upgraded my gentoo system.
I synchronized my portage tree just now.
It was installed about a year ago.
The python version is 2.4.4-r6.
But when I was trying to install python 2.5, I've got an eapi exception.
And the installation failed.
And my portage upgrade is also blocked due to the bash version.
How can I upgrade my portage?
 
Any hint would be appreciated and thanks in advance.