# HG changeset patch
# User shantanu <shantanu@fossee.in>
# Date 1260257774 -19800
# Node ID 0a6ab1d81491f0e1ca626c52a0b643bcb796bb13
# Parent  4075482a97701c3af7dbc4071a13453cd847ef21
Some more changes for day 2 sessions.

diff -r 4075482a9770 -r 0a6ab1d81491 day2/cheatsheet1.tex
--- a/day2/cheatsheet1.tex	Tue Dec 08 12:40:07 2009 +0530
+++ b/day2/cheatsheet1.tex	Tue Dec 08 13:06:14 2009 +0530
@@ -134,7 +134,7 @@
 In []: p = 'World'
 In []: s + p  #concatenating two strings
 Out[]: 'HelloWorld'
-In []: s * 4  #repeating string for given num of times
+In []: s * 4  #repeat string for given number of times
 Out[]: 'HelloHelloHelloHello'
 \end{lstlisting}
 \subsection{Relational and Logical Operators}
diff -r 4075482a9770 -r 0a6ab1d81491 day2/cheatsheet2.tex
--- a/day2/cheatsheet2.tex	Tue Dec 08 12:40:07 2009 +0530
+++ b/day2/cheatsheet2.tex	Tue Dec 08 13:06:14 2009 +0530
@@ -40,23 +40,23 @@
     statement1
     statement2
 \end{lstlisting}
-All the statements are executed, till the condition statement evaluates to True.
+All statements are executed, till the condition statement evaluates to True.
 \subsection{\typ{for} and \typ{range}}
 \typ{range(start, stop, step)}\\
 returns a list containing an arithmetic progression of integers.\\
 Of the arguments mentioned above, both start and step are optional.\\
-For example, if we skip third argument, i.e \typ{step}, then default value is 1. So:
+For example, if we skip third argument, i.e \typ{step}, default is taken as 1. So:
 \begin{lstlisting}
 In []: range(1,10)
 Out[]: [1, 2, 3, 4, 5, 6, 7, 8, 9]
 \end{lstlisting}
 \textbf{Note:} stop value is not included in the list.\\
-Similarly if we don't pass \typ{start} argument, default is taken to be 0.
+Similarly if we don't pass \typ{first} argument (in this case \typ{start}), default is taken to be 0.
 \begin{lstlisting}
 In []: range(10)
 Out[]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
 \end{lstlisting}
-In case \typ{step} is mentioned, the jump between consecutive members of the list would be equal to that.
+In case third argument is mentioned(\typ{step}), the jump between consecutive members of the list would be equal to that.
 \begin{lstlisting}
 In []: range(1,10,2)
 Out[]: [1, 3, 5, 7, 9]
@@ -94,14 +94,14 @@
 In []: num[-1]
 Out[]: 4
 \end{lstlisting}
-\textbf{Note: }\typ{-1} points the last element in a list. Similarly to access third last element of a list one can use: 
+\textbf{Note: }\typ{-1} points to last element in a list. Similarly to access third last element of a list one can use: 
 \begin{lstlisting}
 In []: num[-3]
 Out[]: 2  
 \end{lstlisting}
-\subsection{Adding lists and elements}
+\subsection{\typ{list} operations}
 \begin{lstlisting}
-In []: num += [9, 10, 11] # Adding two lists
+In []: num += [9, 10, 11] # Concatenating two lists
 In []: num
 Out[]: [1, 2, 3, 4, 9, 10, 11]
 \end{lstlisting}
@@ -162,7 +162,7 @@
 In []: a[::2]
 Out[]: [1, 3, 5]
 \end{lstlisting}
-Start from beginning(since \typ{initial} is blank), till last of list(this time last element is included, as \typ{final} is blank), with step size of 2.\\
+Start from beginning(since \typ{initial} is blank), till last(this time last element is included, as \typ{final} is blank), with step size of 2.\\
 Apart from using \typ{reverse} command on list, one can also use slicing in special way to get reverse of a list.
 \begin{lstlisting}
 In []: a[-1:-4:-1]
@@ -228,13 +228,13 @@
 Out[21]: {'Avg': 52.530000000000001, 'Inn': 233, 
           'Name': 'Rahul Dravid', 'Runs': 10823}
 \end{lstlisting}
-\textbf{Note:} Duplicate keys are overwritten!\\
 \begin{lstlisting}
 In []: player['Name'] = 'Dravid'
 In []: player
 Out[23]: {'Avg': 52.530000000000001, 'Inn': 233, 
           'Name': 'Dravid', 'Runs': 10823}
 \end{lstlisting}
+\textbf{Note:} Duplicate keys are overwritten!
 \subsection{containership}
 \begin{lstlisting}
 In []: 'Inn' in player
@@ -242,7 +242,7 @@
 In []: 'Econ' in player
 Out[]: False
 \end{lstlisting}
-\textbf{Note:} Containership is always checked on 'keys' of dictionary but not 'values'.\\
+\textbf{Note:} Containership is always checked on 'keys' of dictionary, never on 'values'.\\
 \subsection{Methods}
 \begin{lstlisting}
 In []: player.keys() # returns list of all keys
@@ -279,4 +279,3 @@
 Out[]: True
 \end{lstlisting}
 \end{document}
-
diff -r 4075482a9770 -r 0a6ab1d81491 day2/cheatsheet3.tex
--- a/day2/cheatsheet3.tex	Tue Dec 08 12:40:07 2009 +0530
+++ b/day2/cheatsheet3.tex	Tue Dec 08 13:06:14 2009 +0530
@@ -26,16 +26,18 @@
 \large{FOSSEE}
 \end{center}
 \section{Function}
-They allows us to enclose a set of statements and call the function again and again instead of repeating the group of statements every-time. 
+They allows us to enclose a set of statements and call them again and again instead of repeating the group of statements every-time. 
 \subsection{Function definition}
   \begin{lstlisting}
-def signum( r ):    
-    if r < 0:
-        return -1
-    elif r > 0:
-        return 1
-    else:
-        return 0
+In []: def signum(r):
+   ...:     if r < 0:
+   ...:         return -1
+   ...:     elif r > 0:
+   ...:         return 1
+   ...:     else:
+   ...:         return 0
+   ...:     
+   ...:
   \end{lstlisting}
 %\typ{def} is a keyword, which is used to define a function with given name.
 \subsection{Usage}
@@ -48,7 +50,7 @@
 Out[]: -1
 In []: signum() # ERROR signum() takes exactly 1 argument(0 given)
 \end{lstlisting}
-\textbf{Note:} Arguments passed to a function are passed by-value \textbf{only if} they are basic Python data type(int, float). In case one pass immutable types(String, tupels), they cant be modified in the function, but objects like \typ{list} and dictionary can be manipulated.
+\textbf{Note:} Arguments passed to a function are passed by-value \textbf{only if} they are basic Python data type(int, float). In case one passes immutable types(String, tupels), they cant be modified in the function, but objects like \typ{list} and dictionary can be manipulated.
 \subsection{Default Arguments}
 This feature allow the functions to take the arguments optionally. For example:
 \begin{lstlisting}
@@ -57,7 +59,7 @@
 In []: greet.split()
 Out[]: ['hello', 'world']
 \end{lstlisting}
-In above case, default argument which \typ{split} function uses is a blank space. One can pass argument also, to split the string for a different delimiter.
+In above case, default argument which \typ{split} function uses is a blank space. One can pass argument also to split the string for a different delimiter.
 \begin{lstlisting}
 In []: line = 'Rossum, Guido, 54, 46, 55'
 
@@ -98,6 +100,7 @@
 In [15]: wish(name='vattam', greetings = 'get lost')
 get lost vattam
 \end{lstlisting}
+% sorry Vattam just a joke :P
 \section{Self contained python script}
 Functions like \typ{plot}, \typ{linspace} etc are not inbuilt functions. One have to import them to use them.
   \begin{lstlisting}
@@ -115,20 +118,19 @@
 xlim(-5*pi, 5*pi)
 ylim(-5*pi, 5*pi)
   \end{lstlisting}
-Above mentioned code will work with following setup:
+These import statements are necessary to make program self contained. After importing, we can run script via:\\
+\typ{$ python sine_plot.py} \\ %$ 
+We no longer need:
 \begin{lstlisting}
 $ ipython -pylab
 In []: %run -i sine_plot.py
 \end{lstlisting} %$
-as we are already including \typ{pylab} into \typ{ipython}. But to make it work independently so that even\\
-\typ{$ python sine_plot.py} \\ %$ 
-works, one will have to use \typ{import} statements.\\
 \section{objects}
 In Python everything is a object! All variables, lists, tuples, dictionaries and even functions are objects. 
 \begin{lstlisting}
-In []: a = str() 
+In []: a = str() # initializing a string object.
 In []: b = "Hello World"
-In []: b.split()
+In []: b.split() # calling funciton on object 'b'
 Out[]: ['Hello', 'World']
 \end{lstlisting}
 ``.'' is a operator used to call functions defined for given object.
diff -r 4075482a9770 -r 0a6ab1d81491 day2/cheatsheet4.tex
--- a/day2/cheatsheet4.tex	Tue Dec 08 12:40:07 2009 +0530
+++ b/day2/cheatsheet4.tex	Tue Dec 08 13:06:14 2009 +0530
@@ -22,11 +22,11 @@
 \date{}
 \vspace{-1in}
 \begin{center}
-\LARGE{Python: Python Development}\\
+\LARGE{Python Development}\\
 \large{FOSSEE}
 \end{center}
 \section{Module}
-Packages like \typ{scipy}, \typ{pylab} etc we used for functions like \typ{plot} are Modules. Modules are Python script, which have various functions and objects, which if imported can be reused. 
+Packages like \typ{scipy}, \typ{pylab} etc we used for functions like \typ{plot}, \typ{linspace} are \textbf{Modules}. They are Python script, which have various functions and objects, which can be imported and reused. 
 \begin{lstlisting}
 def gcd(a, b):
   if a % b == 0: 
@@ -39,6 +39,7 @@
 Save above mentioned python script with name 'gcd.py'. Now we can \typ{import} \typ{gcd} function. For example, in same directory create 'lcm.py' with following content:
 \begin{lstlisting}
 from gcd import gcd    
+
 def lcm(a, b):
   return (a * b) / gcd(a, b)
     
@@ -63,7 +64,7 @@
   print gcd(15, 65)
   print gcd(16, 76)
 \end{lstlisting}
-This \typ{__main__()} helps to create standalone scripts. Code inside it is only executed when we run gcd.py. Hence
+\typ{__main__()} helps to create standalone scripts. Code inside it is only executed when we run gcd.py. Hence
 \begin{lstlisting}
 $ python gcd.py
 5