Workshop materials: comparison day1/session3.tex

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 fields = record.split(';')
 \end{lstlisting}
 \end{frame}
 \begin{frame}[fragile]
-\frametitle{Dictionary}
-\begin{itemize}
-\item lists index: 0 \ldots n
-\item dictionaries index using any hashable objects
-\item d = \{ ``Hitchhiker's guide'' : 42, ``Terminator'' : ``I'll be back''\}
-\item d[``Terminator''] => ``I'll be back''
-\item ``Terminator'' is called the key of \typ{d}
-\item ``I'll be back'' is called the value of the key ``Terminator''
-\end{itemize}
-\end{frame}
-\begin{frame}[fragile]
 \frametitle{Dictionary - Building parsed data}
 \begin{itemize}
 \item Let the parsed data be stored in dictionary \typ{data}
-\item Keys of \typ{data} are strings - region codes
+\item \begin{lstlisting}
-\item Value of the key is another dictionary.
+data = {}  # is an empty dictionary
+\end{lstlisting}
+\item Index of a dictionary is called a \emph{key}
+\item \emph{Keys} of \typ{data} are strings - region codes
+\item Value of a \emph{key} can be any Python object
+\end{itemize}
+\end{frame}
+\begin{frame}[fragile]
+\frametitle{Dictionary - Building parsed data...}
+\begin{itemize}
+\item In this problem let the value of a \emph{key} be another dictionary.
 \item This dictionary contains:
 \begin{itemize}
-\item 'marks': A list of NumPy arrays
+\item 'marks': A \emph{list} of NumPy arrays
 \item 'total': Total marks of each student
 \item 'P': Number of passes
 \item 'F': Number of failures
 \item 'W': Number of withdrawls
 \end{itemize}
 data = {}
 for record in open('sslc1.txt'):
 fields = record.split(';')
 if fields[0] not in data:
 data[fields[0]] = {
-'marks': array([]),
+'marks': [],
-'total': array([]),
+'total': [],
 'P': 0,
 'F': 0,
 'W': 0
 }
 \end{lstlisting}
 data[k]['sub_avg'] = sub_avg
 data[k]['sub_std'] = sub_std
 \end{lstlisting}
 \end{frame}
+\begin{frame}[fragile]
+\frametitle{New Concepts}
+\begin{itemize}
+\item Dictionaries
+\item Slicing lists
+\item New type of conditional
+\item NumPy arrays
+\item Slicing NumPy arrays
+\item NumPy array operations - square, average, sqrt
+\end{itemize}
+\end{frame}
 \end{document}

changeset 166	ddfd95133adc
parent 161	ff22fae4fde5
child 167	5f13be28532d