Added an example of iteration with for with a vector.
Added an example of iteration with for with a vector.

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