python_select cannot detect pre-installed Python programs in Yosemite

[my@…]

I upgraded Mac OS X Maveriacks to OS X Yosemite and followed migration instructions.

Everything works fine but I cannot switch back to the pre-installed Python in Yosemite from Python 2.7.8_3 installed via MacPorts, since python_select cannot find it.

I run the following commad in a terminal:

$ sudo port select --summary

and it returns:

db none db48, none

python none none, python27

If this is a bug of MacPorts with OS X Yosemite, I am looking forward to an update to fix this.

If not, please tell me how to solve this.

Thanks!!