Avoid calling undefined name if IPython import fails.
Avoid calling undefined name if IPython import fails.

scoder/cython,da-woods/cython,cython/cython,da-woods/cython,cython/cython,da-woods/cython,cython/cython,cython/cython,scoder/cython,scoder/cython,da-woods/cython,scoder/cython