% Created 2010-11-12 Fri 02:00

\begin{verbatim}

def gcd(a, b):

      if a % b == 0: 

          return b

      return gcd(b, a%b)

\end{verbatim}

\begin{verbatim}

def gcd(a, b):

    if b == 0:

        return a

    return gcd(b, a%b)

if __name__=='__main__':

    result = gcd(48, 64)

    if result != 16:

        print "Test failed"

    print "Test Passed"

\end{verbatim}

\begin{verbatim}

if __name=__='__main__':

for line in open('numbers.txt'):

    numbers = line.split()

    x = int(numbers[0])

    y = int(numbers[1])

    result = int(numbers[2])

    if gcd(x, y) != result:

        print "Failed gcd test

                      for", x, y

\end{verbatim}

\end{frame}

\begin{frame}

\frametitle{Question 1}

\label{sec-5}

  For the same inputs as gcd write automated tests for LCM.

\end{frame}

\begin{frame}[fragile]

\frametitle{Solution 1}

\label{sec-6}

\begin{verbatim}

def gcd(a, b):

      if a % b == 0: 

          return b

      return gcd(b, a%b)

 def lcm(a, b):

      return (a * b) / gcd(a, b)

  if __name__ == '__main__':

    for line in open('lcmtestcases.txt'):

      numbers = line.split()

      x = int(numbers[0])

      y = int(numbers[1])

      result = int(numbers[2])

      if lcm(x, y) != result:

          print "Failed lcm test for", x, y

\end{verbatim}

\end{frame}

\begin{frame}[fragile]

\frametitle{Meaning full names}

\label{sec-7}

\begin{verbatim}

amount = 12.68

denom = 0.05

nCoins = round(amount / denom)

rAmount = nCoins * denom

\end{verbatim}

\end{frame}

\begin{frame}

\frametitle{Code style}

\label{sec-8}

\begin{itemize}

\item Four Space Indentation

\item 79 character limit on a line

\item Funtions should be seperated by 

   blank line

\item Use Docstring

\item White space around operators

\begin{itemize}

\item l = 32 \% 4

\end{itemize}

\end{itemize}

\end{frame}

\begin{frame}

\frametitle{Question 2}

\label{sec-9}

\begin{itemize}

\item Give meaningful names to the variables in following

     code

\begin{itemize}

\item c = a / b

\end{itemize}

\end{itemize}

\end{frame}

\begin{frame}[fragile]

\frametitle{Solution 2}

\label{sec-10}

\begin{verbatim}

quotient = dividend / divisor

\end{verbatim}

\end{frame}

\begin{frame}[fragile]

\frametitle{Code Snippet}

\label{sec-11}

\begin{verbatim}

while True print 'Hello world'

\end{verbatim}

\end{frame}

\begin{frame}[fragile]

\frametitle{Error}

\label{sec-12}

\begin{lstlisting}

 while True print 'Hello world'

 \end{lstlisting}

  \begin{lstlisting}

  File "<stdin>", line 1, in ?

    while True print 'Hello world'

SyntaxError: invalid syntax

\end{frame}

\begin{frame}[fragile]

\frametitle{Code Snippet}

\label{sec-13}

\begin{verbatim}

a = raw_input("Enter a number")

try:

      num = int(a)

 except:

      print "Wrong input ..."

\end{verbatim}

\end{frame}

\begin{frame}[fragile]

\frametitle{Using idb}

\label{sec-14}

\small

\begin{lstlisting}

In []: import mymodule

In []: mymodule.test()

---------------------------------------------

NameError   Traceback (most recent call last)

<ipython console> in <module>()

mymodule.py in test()

      1 def test():

      2     total=1+1

----> 3     print spam

NameError: global name 'spam' is not defined

In []: %debug

> mymodule.py(2)test()

      0     print spam

ipdb> total

2

\end{lstlisting}

\end{frame}

\begin{frame}

\frametitle{Summary}

\label{sec-15}

\begin{itemize}

\item Create simple tests for a function.

\item Learn to Automate tests using many predefined test cases.

\item Good coding standards.

\item Difference between syntax error and exception.

\item Handling exception using try and except.

\item Using \%debug for debugging on ipython.

\end{itemize}

\end{frame}

\begin{frame}

\frametitle{Thank you!}

\label{sec-16}

  \begin{block}{}

  \begin{center}

  This spoken tutorial has been produced by the

  \textcolor{blue}{FOSSEE} team, which is funded by the 

  \end{center}

  \begin{center}

    \textcolor{blue}{National Mission on Education through \\

      Information \& Communication Technology \\ 

      MHRD, Govt. of India}.

  \end{center}  

  \end{block}