restructring repo

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-\section{Using Python modules}
-
-\begin{frame}[fragile]
-  \frametitle{\texttt{hello.py}}
-    \begin{itemize}
-    \item Script to print `hello world' -- \texttt{hello.py}
-    \end{itemize}
-    \begin{lstlisting}
-     print "Hello world!"
-    \end{lstlisting}
-    \begin{itemize}
-    \item We have been running scripts from IPython
-    \end{itemize}
-    \begin{lstlisting}
-     In[]: %run -i hello.py
-    \end{lstlisting}
-    \begin{itemize}
-    \item Now, we run from the shell using python
-    \end{itemize}
-    \begin{lstlisting}
-      $ python hello.py
-    \end{lstlisting} %$
-\end{frame}
-
-\begin{frame}[fragile]
-  \frametitle{Simple plot}
-  \begin{itemize}
-  \item Save the following in \texttt{sine\_plot.py} 
-  \end{itemize}
-  \begin{lstlisting}
-  x = linspace(-2*pi, 2*pi, 100)
-  plot(x, sin(x))
-  show()
-  \end{lstlisting}
-  \begin{itemize}
-  \item Now, let us run the script
-  \end{itemize}
-  \begin{lstlisting}
-    $ python sine_plot.py
-  \end{lstlisting} % $
-  \begin{itemize}
-  \item What's wrong?
-  \end{itemize}
-\end{frame}
-
-
-\begin{frame}[fragile]
-  \frametitle{Importing}
-  \begin{itemize}
-  \item \texttt{-pylab} is importing a lot of functionality
-  \item Add the following to the top of your file
-  \end{itemize}
-  \begin{lstlisting}
-   from scipy import *
-  \end{lstlisting}
-  \begin{lstlisting}
-    $ python sine_plot.py
-  \end{lstlisting} % $
-  \begin{itemize}
-  \item Now, plot is not found
-  \item Add the following as the second line of your script
-  \end{itemize}
-  \begin{lstlisting}
-    from pylab import *
-  \end{lstlisting}
-  \begin{lstlisting}
-    $ python sine_plot.py
-  \end{lstlisting} % $
-  \begin{itemize}
-  \item It works!
-  \end{itemize}
-\end{frame}
-
-\begin{frame}[fragile]
-  \frametitle{Importing \ldots}
-  \begin{itemize}
-  \item \texttt{*} imports everything from \texttt{scipy} and
-    \texttt{pylab}
-  \item But, It imports lot of unnecessary stuff
-  \item And two modules may contain the same name, causing a conflict
-  \item There are two ways out
-  \end{itemize}
-  \begin{lstlisting}
-    from scipy import linspace, pi, sin
-    from pylab import plot, show
-  \end{lstlisting}
-  \begin{itemize}
-  \item OR change the imports to following and 
-  \item Replace \texttt{pi} with \texttt{scipy.pi}, etc. 
-  \end{itemize}
-  \begin{lstlisting}
-    import scipy
-    import pylab
-  \end{lstlisting}
-\end{frame}
-
-\section{Writing modules}
-
-\begin{frame}[fragile]
-  \frametitle{GCD script}
-  \begin{itemize}
-  \item Function that computes gcd of two numbers
-  \item Save it as \texttt{gcd\_script.py}
-  \end{itemize}
-  \begin{lstlisting}
-    def gcd(a, b):
-        while b:
-            a, b = b, a%b
-        return a
-  \end{lstlisting}
-  \begin{itemize}
-  \item Also add the tests to the file
-  \end{itemize}
-  \begin{lstlisting}
-    if gcd(40, 12) == 4 and gcd(12, 13) == 1:
-        print "Everything OK"
-    else:
-        print "The GCD function is wrong"
-  \end{lstlisting}
-  \begin{lstlisting}
-    $ python gcd_script.py
-  \end{lstlisting} % $
-\end{frame}
-
-\begin{frame}[fragile]
-  \frametitle{Python path}
-  \begin{itemize}
-  \item In IPython type the following
-  \end{itemize}
-  \begin{lstlisting}
-    import sys
-    sys.path
-  \end{lstlisting}
-  \begin{itemize}
-  \item List of locations where python searches for a module
-  \item \texttt{import sys} -- searches for file \texttt{sys.py} or
-    dir \texttt{sys} in all these locations
-  \item So, our own modules can be in any one of the locations
-  \item Current working directory is one of the locations
-  \end{itemize}
-\end{frame}
-
-\begin{frame}[fragile]
-  \frametitle{\texttt{\_\_name\_\_}}
-  \begin{lstlisting}
-    import gcd_script
-  \end{lstlisting}
-  \begin{itemize}
-  \item The import is successful
-  \item But the test code, gets run
-  \item Add the tests to the following \texttt{if} block
-  \end{itemize}
-  \begin{lstlisting}
-    if __name__ == "__main__":
-  \end{lstlisting}
-  \begin{itemize}
-  \item Now the script runs properly 
-  \item As well as the import works; test code not executed
-  \item \texttt{\_\_name\_\_} is local to every module and is equal
-    to \texttt{\_\_main\_\_} only when the file is run as a script.
-  \end{itemize}
-\end{frame}
-