Python Program for finding Real Wave Quantum Mechanics Eigenstates for 2-D SHO Potential

This python program is as used in "Real Wave Quantum Mechanics: Solutions for 2-D Simple Harmonic Potential Well."  Developed using Spyder. Can be copied and pasted into a Jupyter notebook. The matrix used is quite large and takes a while to build. Subsequent runs will use a pickled version of the matrix (also large) which has been stored stored on your computer. Runs can take 5 to 10 minutes on a powerful PC.  For smaller illustrative runs, use a smaller grid (N) and increase the SHO constant to ensure the electron structure is confined within it.