Sage 6.3 on OS X 10.9 cannot launch python

[hxiao...@connect.hku.hk]

I have Sage 6.3 installed on my Mac OS X 10.9. I can launch Sage via application icon or terminal. However, when I tried to launch ipython via sage, 

`$ sage -ipython`

I was told that ipython does not exist. What should I do? Thanks a lot.

[slelievre]

I saw you asked a similar question on ask-sage, and I tried to answer there.

    http://ask.sagemath.org/question/24125/cannot-launch-sage-with-options-on-os-x/