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-\documentclass[14pt,compress,aspectratio=169]{beamer}
-
-\input{macros.tex}
-
-\title[OOP containership]{Advanced Python}
-\subtitle{Object Oriented Programming: containership }
-
-\author[FOSSEE] {The FOSSEE Group}
-
-\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}
-\date[] {Mumbai, India}
-
-\begin{document}
-
-\begin{frame}
-  \titlepage
-\end{frame}
-
-\begin{frame}
-  \frametitle{Recap}
-  \begin{itemize}
-  \item Created \lstinline{Talk} and \lstinline{Tutorial} classes
-  \item Know how to create objects: instantiation of a class
-    \vspace*{0.5in}
-
-  \item Let us create a conference!
-  \end{itemize}
-\end{frame}
-
-\begin{frame}[fragile]
-  \frametitle{Conference class}
-  \vspace*{-0.1in}
-\begin{lstlisting}
-class Conference:
-    def __init__(self, talks=None):
-        if talks is None:
-            talks = []
-        self.talks = talks
-
-    def add_talk(self, talk):
-        self.talks.append(talk)
-
-    def schedule(self):
-        for talk in self.talks:
-            print(talk.speaker, talk.title)
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[fragile]
-  \frametitle{Using this}
-\begin{lstlisting}
-In []: c = Conference()
-
-In []: t = Talk('Guido', 'Python4', 'py,core')
-
-In []: c.add_talk(t)
-
-In []: c.schedule()
-
-\end{lstlisting}
-  \begin{itemize}
-  \item Easy to read
-  \item Nicely split up
-  \item Reflects the real world
-
-  \end{itemize}
-\end{frame}
-
-\begin{frame}[fragile]
-  \frametitle{But why not this?}
-\begin{lstlisting}
-class Conference:
-    def __init__(self, talks=[]):
-        self.talks = talks
-\end{lstlisting}
-  \begin{itemize}
-  \item Easier
-  \item Less code
-  \item Let's try it!
-  \end{itemize}
-\end{frame}
-
-\begin{frame}[fragile]
-  \frametitle{Gotcha!}
-\begin{lstlisting}
-In []: c1 = Conference()
-In []: c1.add_talk(1)
-In []: c1.talks
-
-In []: c2 = Conference()
-In []: c2.talks
-
-\end{lstlisting}
-
-  \begin{itemize}
-  \item What is going on?
-  \end{itemize}
-\end{frame}
-
-\begin{frame}
-  \frametitle{Beware of mutable default arguments!}
-  \begin{itemize}
-  \item Default arguments are evaluated once
-  \item When the method/function is defined
-  \item So, if the object is mutable we have a problem
-  \end{itemize}
-\end{frame}
-
-\begin{frame}[fragile]
-  \frametitle{Which is why we have this}
-\begin{lstlisting}
-class Conference:
-    def __init__(self, talks=None):
-        if talks is None:
-            talks = []
-        self.talks = talks
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}
-  \frametitle{Containership}
-  \begin{itemize}
-  \item \lstinline{Conference} class manages all the talks
-  \item It contains the talks and tutorials
-  \item Allows us to build complexity by \alert{composition}
-  \item Hierarchical organization
-  \item Allows us to mirror the real objects in code
-  \end{itemize}
-\end{frame}
-
-\begin{frame}
-  \frametitle{Some more examples}
-  \begin{itemize}
-  \item OOP for a \lstinline{Company} class
-  \item OOP for a \lstinline{Bank}
-  \item OOP for a \lstinline{School} or \lstinline{College}
-  \item OOP for a cell phone, computer, ...
-  \end{itemize}
-\end{frame}
-
-\begin{frame}
-  \frametitle{Design guidelines}
-  \begin{itemize}
-  \item Important to make sense
-  \item Should be easy to explain the relationships and responsibilities of
-    each class
-  \item Inheritance should ``read'' correctly and make sense
-  \item No object should be too responsible
-  \item Functionality should be suitably delegated
-  \end{itemize}
-\end{frame}
-
-\begin{frame}
-  \frametitle{Summary}
-  \begin{itemize}
-  \item Creating a more complex class
-  \item Containing other objects
-  \item Issue with mutable default arguments
-  \item Important design guidelines
-  \end{itemize}
-\end{frame}
-
-
-\end{document}