Looks fine on my github account and also my editor.
I have 4 spaces before the return statement as per the guidelines.

Screenshot:
![image](https://f.cloud.github.com/assets/2323357/2077937/c59140ca-8db7-11e3-971b-79e4fdf5a814.png)

Link to the file on my profile:
https://github.com/rajaths589/sympy/blob/fixRationalIssue/sympy/core/numbers.py