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-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-% Tutorial slides on Python.
-%
-% Author: FOSSEE
-% Copyright (c) 2017, FOSSEE, IIT Bombay
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\documentclass[14pt,compress]{beamer}
-
-\input{macros.tex}
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-% Title page
-\title[Basic Python]{Practice exercises: functions}
-
-\author[FOSSEE Team] {The FOSSEE Group}
-
-\institute[FOSSEE -- IITB] {Department of Aerospace Engineering\\IIT Bombay}
-\date[] {Mumbai, India}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-% DOCUMENT STARTS
-\begin{document}
-
-\begin{frame}
-  \titlepage
-\end{frame}
-
-\begin{frame}[fragile,plain]
-  \frametitle{Note: Python 2.x and 3.x}
-
- If you are using Python 2.x
-  \begin{itemize}
-  \item Use \typ{raw\_input} instead of \typ{input}
-  \item Use the following for \typ{print}
-  \end{itemize}
- \begin{lstlisting}
-from __future__ import print_function
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain]
-  \frametitle{Exercise: function without arguments}
-  \begin{enumerate}
-  \item Define a function called \typ{prompt}
-  \item The function should ask the user to enter their name (no prompt)
-  \item The function should not take any arguments
-  \item The function should not return anything
-  \item The function should print \typ{Hello <name>}
-  \end{enumerate}
-  For example if the user enters \typ{Sam}, print:
-  Hello Sam
-\end{frame}
-
-\begin{frame}[fragile,plain]
-\frametitle{Solution}
-\begin{lstlisting}
-  def prompt():
-      name = input()
-      print('Hello', name)
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain]
-  \frametitle{Exercise: function with one argument}
-  \begin{enumerate}
-  \item Define a function called \typ{prompt}
-  \item The function should take a single string argument
-  \item \textbf{Do not ask the user for input, i.e. do not use input}
-  \item The function should not return anything
-  \item The function should print \typ{Hello <name>}
-  \end{enumerate}
-  For example if the function is passed \typ{'Sam'}, print:
-  Hello Sam
-\end{frame}
-
-\begin{frame}[fragile,plain]
-\frametitle{Solution}
-\begin{lstlisting}
-  def prompt(name):
-      print('Hello', name)
-\end{lstlisting}
-\end{frame}
-
-
-\begin{frame}[plain,fragile]
-  \frametitle{Exercise: function with \typ{return}}
-  \begin{enumerate}
-  \item Define a function called \typ{prompt}
-  \item The function should take a single string argument
-  \item The function should return a string with \typ{'Hello'}
-  \item \textbf{Do not use input}
-  \item \textbf{Do not print anything}
-  \end{enumerate}
-  For example if the function is passed \typ{'Sam'}, return:
-  \begin{lstlisting}
-    'Hello Sam'
-  \end{lstlisting}
-\end{frame}
-
-\begin{frame}[fragile,plain]
-\frametitle{Solution}
-\begin{lstlisting}
-  def prompt(name):
-      return 'Hello ' + name
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain]
-  \frametitle{Exercise: function with two args}
-  \begin{enumerate}
-  \item Define a function called \typ{add}
-  \item The function should take two arguments
-  \item The function should return the sum of the two arguments
-  \item \textbf{Do not use input}
-  \item \textbf{Do not print anything}
-  \end{enumerate}
-\end{frame}
-
-\begin{frame}[fragile,plain]
-\frametitle{Solution}
-\begin{lstlisting}
-  def add(a, b):
-      return a + b
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain]
-  \frametitle{Exercise: function returning boolean}
-  \begin{enumerate}
-  \item Define a function called \typ{is\_even}
-  \item The function should take a single integer argument
-  \item The function should return \typ{True} if the number is even and \typ{False} otherwise
-  \item \textbf{Do not use input}
-  \item \textbf{Do not print anything}
-  \end{enumerate}
-\end{frame}
-
-\begin{frame}[fragile,plain]
-\frametitle{Naive Solution}
-\begin{lstlisting}
-  def is_even(x):
-      if x%2 == 0:
-          return True
-      else:
-          return False
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[fragile,plain]
-\frametitle{Elegant Solution}
-\begin{lstlisting}
-  def is_even(x):
-      return x%2 == 0
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain,fragile]
-  \frametitle{Exercise: function returning two values}
-  \begin{enumerate}
-  \item Define a function called \typ{even\_square}
-  \item The function should take a single argument
-  \item The function should return if the number is even and the square of the number
-  \item \textbf{Do not use input}
-  \item \textbf{Do not print anything}
-  \end{enumerate}
-  For example:
-  \begin{lstlisting}
-    In []: even_square(2)
-    Out[]: (True, 4)
-    In []: even_square(3)
-    Out[]: (False, 9)
-  \end{lstlisting}
-\end{frame}
-
-\begin{frame}[fragile,plain]
-  \frametitle{Solution}
-  \begin{lstlisting}
-  def even_square(x):
-      return x%2 == 0, x*x
-    \end{lstlisting}
-\end{frame}
-
-
-\begin{frame}[plain,fragile]
-  \frametitle{Exercise: default arguments}
-  \begin{enumerate}
-  \item Define a function called \typ{greet}
-  \item The function should take one positional argument, \typ{name}
-  \item The function should take one optional argument, \typ{message}
-  \item If \typ{message} is not given, it should default to \typ{'Hello'}
-  \item It should return the string with the greeting
-  \end{enumerate}
-  For example:
-  \begin{lstlisting}
-    In []: greet('Sam')
-    Out[]: 'Hello Sam'
-    In []: greet('Sam', 'Hi')
-    Out[]: 'Hi Sam'
-  \end{lstlisting}
-\end{frame}
-
-\begin{frame}[fragile,plain]
-  \frametitle{Solution}
-  \begin{lstlisting}
-    def greet(name, message='Hello'):
-        return message + ' ' + name
-  \end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain, fragile]
-  \frametitle{Exercise: functions and lists}
-  \begin{enumerate}
-  \item Define a function called \typ{to\_lower}
-  \item The function should take a single list of strings
-  \item The function should return the list of strings but all in lowercase
-  \item \textbf{Do not use input}
-  \item \textbf{Do not print anything}
-  \end{enumerate}
-  For example:
-  \begin{lstlisting}
-In []: to_lower(['I', 'am', 'Batman'])
-Out[]: ['i', 'am', 'batman']
-  \end{lstlisting}
-\end{frame}
-
-\begin{frame}[fragile,plain]
-\frametitle{Solution}
-\begin{lstlisting}
-  def to_lower(data):
-      result = []
-      for x in data:
-          result.append(x.lower())
-      return result
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain,fragile]
-  \frametitle{Exercise: list of Fibonacci}
-  \begin{enumerate}
-  \item Define a function called \typ{fib} taking one argument \typ{n}
-  \item Where, \typ{n>0} is an integer but defaults to 8
-  \item Return the first \typ{n} terms of the Fibonacci sequence
-  \end{enumerate}
-  For example:
-  \begin{lstlisting}
-    In []: fib(4)
-    Out[]: [0, 1, 1, 2]
-    In []: fib()
-    Out[]: [0, 1, 1, 2, 3, 5, 8, 13]
-  \end{lstlisting}
-\end{frame}
-
-\begin{frame}[fragile,plain]
-\frametitle{Solution}
-\begin{lstlisting}
-  def fib(n=8):
-      a, b = 0, 1
-      result = [0]
-      for i in range(n-1):
-          result.append(b)
-          a, b = b, a+b
-      return result
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain,fragile]
-  \frametitle{Exercise: returning a function}
-  \begin{enumerate}
-  \item Define a function called \typ{power2()} which takes no argument
-  \item It should return a function which takes a single argument \typ{x} but
-    returns $2^x$
-  \end{enumerate}
-  For example:
-  \begin{lstlisting}
-    In []: f = power2()
-    In []: f(2)
-    Out[]: 4
-    In []: power2()(4)
-    Out[]: 16
-  \end{lstlisting}
-\end{frame}
-
-\begin{frame}[fragile,plain]
-\frametitle{Solution}
-\begin{lstlisting}
-  def power2():
-      def f(x):
-          return 2**x
-      return f
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[fragile,plain]
-  \frametitle{Another solution}
-  \begin{lstlisting}
-    def power(n=2):
-        def f(x):
-            return n**x
-        return f
-   \end{lstlisting}
-   \begin{itemize}
-   \item This is called a closure.
-   \item Note that \typ{f} ``stores'' the value of \typ{n}
-   \end{itemize}
-   \pause
-   \begin{lstlisting}
-     In []: p2 = power(2)
-     In []: p3 = power(3)
-     In []: p2(2)
-     Out[]: 4
-     In []: p3(2)
-     Out[]: 9
-  \end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain,fragile]
-  \frametitle{Exercise: function as an argument}
-  \begin{enumerate}
-  \item Define a function called \typ{apply(f, data)}
-  \item Where \typ{f} is a function taking a single value
-  \item Where \typ{data} is a list
-  \item It should return a list where the function is applied to each element
-    of \typ{data}
-  \end{enumerate}
-  For example:
-  \begin{lstlisting}
-    In []: def double(x):
-    .....:    return 2*x
-    .....:
-    In []: apply(double, [1, 2, 3])
-    Out[]: [2, 4, 6]
-  \end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain, fragile]
-  \frametitle{Solution}
-  \begin{lstlisting}
-    def apply(f, data):
-        result = []
-        for x in data:
-            result.append(f(x))
-        return result
-  \end{lstlisting}
-\end{frame}
-
-\begin{frame}
-  \centering
-  \Huge
-
-  That's all folks!
-\end{frame}
-\end{document}
-
-\end{document}