Added quickrefs for dictionaries, getting started with arrays, for, matrices, other plots, savefig, using python modules.
See where python searches for modules:\\
{\ex \lstinline| sys.path|}
Include our own path in PYTHONPATH:\\
{\ex \lstinline| sys.path.append(our_path)|}
Run certian code only if executed and not if imported:\\
{\ex \lstinline| if __name__=="__main__": #do something|}