Added quickrefs for dictionaries, getting started with arrays, for, matrices, other plots, savefig, using python modules.
Defining dictionary:\\
{\ex \lstinline| d = {'k1':'v1', 'k2':'v2'}|}
Access value using key in dictionary:\\
{\ex \lstinline| print d['k1']|}
Add key-value pair to dictionary:\\
{\ex \lstinline| d['k3'] = 'v3'|}
Delete key-value from dictionary:\\
{\ex \lstinline| del d['k1']|}
Check container-ship of key in dictionary:\\
{\ex \lstinline| 'k2' in d|}
List of keys in dictionary:\\
{\ex \lstinline| d.keys()|}
List of values in dictionary:\\
{\ex \lstinline| d.values()|}