Changes made for Goa workshop .

3 files changed, 271 insertions, 61 deletions

diff --git a/day2/session3.tex b/day2/session3.tex
index 95b5081..bee8030 100644
--- a/day2/session3.tex
+++ b/day2/session3.tex
@@ -95,12 +95,12 @@
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Title page
-\title[]{3D data Visualization}
+\title[3D Plotting]{3D data Visualization}
 
 \author[FOSSEE] {FOSSEE}
 
 \institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}
-\date[] {1, November 2009\\Day 2, Session 3}
+\date[] {1 November, 2009\\Day 2, Session 5}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
@@ -279,10 +279,9 @@ In []: mlab.test_contour3d??
     \end{columns}
 
     \begin{lstlisting}
-In []: from numpy import *
 In []: t = linspace(0, 2*pi, 50)
 In []: u = cos(t) * pi
-in []: x, y, z = sin(u), cos(u), sin(t)
+In []: x, y, z = sin(u), cos(u), sin(t)
     \end{lstlisting}
     \emphbar{\PythonCode{In []: mlab.points3d(x, y, z)}}
 \end{frame}
@@ -319,6 +318,40 @@ In []: z = sin(x*x + y*y)
 \end{frame}
 
 \begin{frame}[fragile]
+  \frametitle{mgrid}
+  \begin{lstlisting}
+In []: mgrid[0:3,0:3]
+Out[]: 
+array([[[0, 0, 0],
+        [1, 1, 1],
+        [2, 2, 2]],
+
+       [[0, 1, 2],
+        [0, 1, 2],
+        [0, 1, 2]]])
+
+In []: mgrid[-1:1:5j]
+Out[]: array([-1., -0.5,  0.,  0.5,  1.])
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]
+  \frametitle{Example}
+  \begin{lstlisting}
+In []: x, y = mgrid[-1:1:5j, -1:1:5j]
+In []: z = x*x + y*y
+
+In []: z
+Out[]: 
+array([[ 2.  , 1.25, 1.  , 1.25, 2.  ],
+       [ 1.25, 0.5 , 0.25, 0.5 , 1.25],
+       [ 1.  , 0.25, 0.  , 0.25, 1.  ],
+       [ 1.25, 0.5 , 0.25, 0.5 , 1.25],
+       [ 2.  , 1.25, 1.  , 1.25, 2.  ]])
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]
     \myemph{\Large 2D data: \texttt{mlab.mesh}}
     \vspace*{0.25in}
 
@@ -328,7 +361,7 @@ In []: z = sin(x*x + y*y)
 
     \vspace*{0.25in}
 \begin{lstlisting}
-In []: phi, theta = numpy.mgrid[0:pi:20j, 
+In []: phi, theta = mgrid[0:pi:20j, 
 ...                         0:2*pi:20j]
 In []: x = sin(phi)*cos(theta)
 In []: y = sin(phi)*sin(theta)
@@ -349,7 +382,7 @@ In []: mlab.mesh(x, y, z,
         \pgfimage[width=1.5in]{MEDIA/m2/mlab/contour3d}\\        
     \end{columns}
 \begin{lstlisting}
-In []: x, y, z = ogrid[-5:5:64j, 
+In []: x, y, z = mgrid[-5:5:64j, 
 ...                -5:5:64j, 
 ...                -5:5:64j]
 In []: mlab.contour3d(x*x*0.5 + y*y + 
diff --git a/day2/session4.tex b/day2/session4.tex
index 0ed5ccc..577841f 100644
--- a/day2/session4.tex
+++ b/day2/session4.tex
@@ -95,14 +95,12 @@
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Title page
-\title[]{Debugging and \\Test Driven Approach}
+\title[Python Development]{Python Development}
 
 \author[FOSSEE] {FOSSEE}
 
 \institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}
-\date[] {11, October 2009}
-\date[] % (optional)
-
+\date[] {1 November, 2009\\Day 2, Session 3}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 %\pgfdeclareimage[height=0.75cm]{iitblogo}{iitblogo}
@@ -142,13 +140,147 @@
   \maketitle
 \end{frame}
 
+\section{Tests: Getting started}
+\begin{frame}[fragile] 
+  \frametitle{gcd revisited!}
+  \begin{itemize}
+  \item Open gcd.py
+  \end{itemize}  
+\begin{lstlisting}
+    def gcd(a, b):
+        if a % b == 0: 
+            return b
+        return gcd(b, a%b)
+
+    print gcd(15, 65)
+    print gcd(16, 76)
+\end{lstlisting}
+  \begin{itemize}
+  \item python gcd.py
+  \end{itemize}
+\end{frame}
+
+\begin{frame}[fragile] 
+  \frametitle{Find lcm using our gcd module}
+  \begin{itemize}
+  \item Open lcm.py  
+  \item $lcm = \frac{a*b}{gcd(a,b)}$
+  \end{itemize}  
+\begin{lstlisting}
+    from gcd import gcd    
+    def lcm(a, b):
+        return (a * b) / gcd(a, b)
+    
+    print lcm(14, 56)
+\end{lstlisting}
+  \begin{itemize}
+  \item python lcm.py
+  \end{itemize}
+  \begin{lstlisting}
+5
+4
+56
+  \end{lstlisting}    
+\end{frame}
+
+\begin{frame}[fragile] 
+  \frametitle{Writing stand-alone module}  
+Edit gcd.py file to:
+\begin{lstlisting}
+    def gcd(a, b):
+        if a % b == 0: 
+            return b
+        return gcd(b, a%b)
+
+    if __name__ == "__main__":        
+        print gcd(15, 65)
+        print gcd(16, 76)
+\end{lstlisting}
+  \begin{itemize}
+  \item python gcd.py
+  \item python lcm.py
+  \end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]
+  \frametitle{More use of main}
+  For automating tests.
+  \begin{lstlisting}
+if __name__ == '__main__':
+    for line in open('numbers.txt'):
+        numbers = line.split()
+        x = int(numbers[0])
+        y = int(numbers[1])
+        result = (int(numbers[2]))
+        assert gcd(x, y) == result
+  \end{lstlisting}  
+\end{frame}
+
+\section{Coding Style}
+\begin{frame}{Readability and Consistency}
+    \begin{itemize}
+        \item Readability Counts!\\Code is read more often than its written.
+        \item Consistency!
+        \item Know when to be inconsistent.
+      \end{itemize}
+\end{frame}
+
+\begin{frame}[fragile] \frametitle{A question of good style}
+  \begin{lstlisting}
+    amount = 12.68
+    denom = 0.05
+    nCoins = round(amount/denom)
+    rAmount = nCoins * denom
+  \end{lstlisting}
+  \pause
+  \begin{block}{Style Rule \#1}
+    Naming is 80\% of programming
+  \end{block}
+\end{frame}
+
+\begin{frame}[fragile]
+  \frametitle{Code Layout}
+  \begin{itemize}
+        \item Indentation
+        \item Tabs or Spaces??
+        \item Maximum Line Length
+        \item Blank Lines
+        \item Encodings
+   \end{itemize}
+\end{frame}
+
+\begin{frame}{Whitespaces in Expressions}
+  \begin{itemize}
+        \item When to use extraneous whitespaces??
+        \item When to avoid extra whitespaces??
+        \item Use one statement per line
+   \end{itemize}
+\end{frame}
+
+\begin{frame}{Comments}
+  \begin{itemize}
+        \item No comments better than contradicting comments
+        \item Block comments
+        \item Inline comments
+   \end{itemize}
+\end{frame}
+
+\begin{frame}{Docstrings}
+  \begin{itemize}
+        \item When to write docstrings?
+        \item Ending the docstrings
+        \item One liner docstrings
+   \end{itemize}
+More information at PEP8: http://www.python.org/dev/peps/pep-0008/
+\inctime{5}
+\end{frame}
 
 \section{Debugging}
 \subsection{Errors and Exceptions}
 \begin{frame}[fragile]
  \frametitle{Errors}
  \begin{lstlisting}
->>> while True print 'Hello world'
+In []: while True print 'Hello world'
  \end{lstlisting}
 \pause
   \begin{lstlisting}
@@ -162,7 +294,7 @@ SyntaxError: invalid syntax
 \begin{frame}[fragile]
  \frametitle{Exceptions}
  \begin{lstlisting}
->>> print spam
+In []: print spam
 \end{lstlisting}
 \pause
 \begin{lstlisting}
@@ -175,7 +307,7 @@ NameError: name 'spam' is not defined
 \begin{frame}[fragile]
  \frametitle{Exceptions}
  \begin{lstlisting}
->>> 1 / 0
+In []: 1 / 0
 \end{lstlisting}
 \pause
 \begin{lstlisting}
@@ -186,6 +318,44 @@ or modulo by zero
 \end{lstlisting}
 \end{frame}
 
+\begin{frame}[fragile]
+  \frametitle{Handling Exceptions}
+  Python uses \typ{try} and \typ{except} clause.
+  %%Revisiting the raw\_input
+  \begin{lstlisting}
+a = raw_input('Enter number(Q to quit):')
+try:
+    num = int(a)
+    print num
+except:
+    if a == 'Q':
+        print 'Exiting...'
+    else:
+        print 'Wrong input!'      
+  \end{lstlisting}
+  
+  
+\end{frame}
+
+%% \begin{frame}[fragile]
+%%   \frametitle{Solving it with \typ{try} and \typ{except}}
+%% \vspace{-0.2in}
+%%   \begin{lstlisting}
+%% highest = 0
+%% for record in open('sslc1.txt'):
+%%     fields = record.split(';')
+%%     try:
+%%         total = 0
+%%         for score_str in fields[3:8]:
+%%             score = int(score_str)
+%%             total += score
+%%         if total > highest:
+%%             highest = total
+%%     except:        
+%%         pass
+%% print highest
+%%   \end{lstlisting}
+%% \end{frame}
 \subsection{Strategy}
 \begin{frame}[fragile]
     \frametitle{Debugging effectively}
@@ -209,8 +379,8 @@ or modulo by zero
 \frametitle{Debugging in IPython}
 \small
 \begin{lstlisting}
-In [1]: import mymodule
-In [2]: mymodule.test()
+In []: import mymodule
+In []: mymodule.test()
 ---------------------------------------------
 NameError   Traceback (most recent call last)
 <ipython console> in <module>()
@@ -219,7 +389,7 @@ mymodule.py in test()
 ----> 2     print spam
 NameError: global name 'spam' is not defined
 
-In [3]: %debug
+In []: %debug
 > mymodule.py(2)test()
       0     print spam
 ipdb> 
@@ -232,19 +402,21 @@ ipdb>
 \frametitle{Debugging: Exercise}
 \small
 \begin{lstlisting}
-import keyword
-f = open('/path/to/file')
-
-freq = {}
-for line in f:
-    words = line.split()
-    for word in words:
-        key = word.strip(',.!;?()[]: ')
-        if keyword.iskeyword(key):
-            value = freq[key]
-            freq[key] = value + 1
-
-print freq
+science = {}
+
+for record in open('sslc1.txt'):
+    fields = record.split(';')
+    region_code = fields[0].strip()
+
+    score_str = fields[6].strip()
+    score = int(score_str) if score_str != 'AA' 
+                           else 0
+
+    if score > 90:
+        science[region_code] += 1
+
+pie(science.values(), labels=science.keys())
+savefig('science.png')
 \end{lstlisting}
 \inctime{10}
 \end{frame}
@@ -263,7 +435,7 @@ print freq
 
 \section{Test Driven Approach}
 \begin{frame}
-    \frametitle{Need of Testing!}
+    \frametitle{Need for Testing!}
    
     \begin{itemize}
         \item Quality
@@ -293,17 +465,19 @@ def is_palindrome(input_str):
 \begin{frame}[fragile]
     \frametitle{Test for the palindrome: palindrome.py}
 \begin{lstlisting}    
-from plaindrome import is_palindrome
 def test_function_normal_words():
   input = "noon"
   assert is_palindrome(input) == True
+
+if __name__ == "main'':
+  test_function_normal_words()
 \end{lstlisting}    
 \end{frame}
 
 \begin{frame}[fragile]
     \frametitle{Running the tests.}
 \begin{lstlisting}    
-$ nosetests test.py 
+$ nosetests palindrome.py 
 .
 ----------------------------------------------
 Ran 1 test in 0.001s
@@ -321,7 +495,7 @@ def test_function_ignore_cases_words():
 \end{lstlisting}
      \vspace*{0.25in}
      Check\\
-     \PythonCode{$ nosetests test.py} \\
+     \PythonCode{$ nosetests palindrome.py} \\
      \begin{block}{Task}
      Tweak the code to pass this test.
      \end{block}
@@ -347,37 +521,39 @@ def test_function_ignore_cases_words():
 %\end{frame}
 %
 
-\begin{frame}[fragile]
-    \frametitle{Exercise}
-    Based on Euclid's algorithm:
-    \begin{center}
-    $gcd(a,b)=gcd(b,b\%a)$
-    \end{center}
-    gcd function can be written as:
-    \begin{lstlisting}
-    def gcd(a, b):
-      if a%b == 0: return b
-      return gcd(b, a%b)
-    \end{lstlisting}
-    \vspace*{-0.15in}
-    \begin{block}{Task}
-      \begin{itemize}
-      \item Write at least 
-        two tests for above mentioned function.
-      \item Write a non recursive implementation
-      of gcd(), and test it using already 
-      written tests.
-      \end{itemize}
-    \end{block}
+%% \begin{frame}[fragile]
+%%     \frametitle{Exercise}
+%%     Based on Euclid's algorithm:
+%%     \begin{center}
+%%     $gcd(a,b)=gcd(b,b\%a)$
+%%     \end{center}
+%%     gcd function can be written as:
+%%     \begin{lstlisting}
+%%     def gcd(a, b):
+%%       if a%b == 0: return b
+%%       return gcd(b, a%b)
+%%     \end{lstlisting}
+%%     \vspace*{-0.15in}
+%%     \begin{block}{Task}
+%%       \begin{itemize}
+%%       \item Write at least 
+%%         two tests for above mentioned function.
+%%       \item Write a non recursive implementation
+%%       of gcd(), and test it using already 
+%%       written tests.
+%%       \end{itemize}
+%%     \end{block}
     
-\inctime{15} 
-\end{frame}
+%% \inctime{15} 
+%% \end{frame}
 
 \begin{frame}
-  \frametitle{We have learned}
+  \frametitle{Summary}
+We have coverd:
   \begin{itemize}
   \item Following and Resolving Error Messages.
   \item Exceptions.
+  \item Handling exceptions
   \item Approach for Debugging.
   \item Writting and running tests.
   \end{itemize}
diff --git a/day2/session5.tex b/day2/session5.tex
index 4fe9cd5..ddb1599 100644
--- a/day2/session5.tex
+++ b/day2/session5.tex
@@ -78,7 +78,7 @@
 \author[FOSSEE] {FOSSEE}
 
 \institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}
-\date[] {1, November 2009\\Day 2}
+\date[] {1 November, 2009\\Day 2, Session 4}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 %\pgfdeclareimage[height=0.75cm]{iitmlogo}{iitmlogo}
@@ -111,12 +111,13 @@
 \end{frame}
 
 \begin{frame}{Problem 1.1}
-  The aliquot of a number is defined as: the sum of the \emph{proper} divisors of the number. For example, aliquot(12) = 1 + 2 + 3 + 4 + 6 = 16.\\
+  The aliquot of a number is defined as: the sum of the \emph{proper} divisors of the number. \\For example: 
+\center{aliquot(12) = 1 + 2 + 3 + 4 + 6 = 16.}\\
   Write a function that returns the aliquot number of a given number. 
 \end{frame}
 
 \begin{frame}{Problem 1.2}
-  A pair of numbers (a, b) is said to be \alert{amicable} if the aliquot number of a is b and the aliquot number of b is a.\\
+  Pair of numbers (a, b) is said to be \alert{amicable} if aliquot number of a is b and aliquot number of b is a.\\
   Example: \texttt{220, 284}\\
   Write a program that prints all four digit amicable pairs.