--- a/loops.rst	Thu Sep 16 17:33:31 2010 +0530
+++ b/loops.rst	Thu Sep 16 20:06:17 2010 +0530
@@ -2,3 +2,123 @@
  Script
 ========
 
+{{{ show the welcome slide }}}
+
+Welcome this tutorial on loops in Python. 
+
+{{{ show the outline slide }}}
+
+In this tutorial, we shall look at ``while`` and ``for`` loops. We
+shall then look at the ``break``, ``continue`` and ``pass`` keywords
+and how to use them. 
+
+{{{ switch to the ipython terminal }}}
+
+We have an ``ipython`` terminal, that we shall use through out this
+tutorial. 
+
+We shall first begin with the ``while`` loop. The ``while`` loop is
+used for repeated execution as long as a condition is ``True``. 
+
+Let us print the squares of all the odd numbers less than 10, using
+the ``while`` loop.
+
+::
+
+  i = 1
+
+  while i<10:
+      print i*i
+      i += 2
+
+This loop prints the squares of the odd numbers below 10. 
+
+The ``while`` loop, repeatedly checks if the condition is true and
+executes the block of code within the loop, if it is. As with any
+other block in Python, the code within the ``while`` block is indented
+to the right by 4 spaces. 
+
+E%% %% Pause the video here and write a ``while`` loop to print the
+squares of all the even numbers below 10. Then, return to the video.
+
+::
+
+  i = 2
+
+  while i<10:
+      print i*i
+      i += 2
+
+Let us now solve the same problem of printing the squares of all odd
+numbers less than 10, using the ``for`` loop. As we know, the ``for``
+loop iterates over a list or any other sequential data type. So, we
+use the ``range`` function to get a list of odd numbers below 10, and
+then iterate over it and print the required stuff. 
+
+::
+
+  for n in range(1, 10, 2):
+      print n*n
+
+E%% %% Pause the video here and write a ``for`` loop to print the
+squares of all the even numbers below 10. Then, return to the video. 
+
+::
+
+  for n in range(2, 10, 2):
+      print n*n
+
+Let us now look at how to use the keywords, ``pass``, ``break`` and
+``continue``.
+
+As we already know, ``pass`` is just a syntactic filler. It is used
+for the sake of completion of blocks, that do not have any code within
+them. 
+
+::
+
+  for n in range(2, 10, 2):
+      pass
+
+``break`` is used to break out of the innermost loop. The ``while``
+loop to print the squares of all the odd numbers below 10, can be
+modified using the ``break`` statement, as follows
+::
+
+  i = 1
+
+  while True:
+      print i*i
+      i += 2
+      if i<10:
+          break
+
+``continue`` is used to skip execution of the rest of the loop on this
+iteration and continue to the end of this iteration. 
+
+Say, we wish to print the squares of all the odd numbers below 10,
+which are not multiples of 3, we would modify the for loop as follows.
+::
+
+  for n in range(1, 10, 2):
+      if n%3 == 0:
+          continue      
+      print n*n
+  
+
+E%% %%Pause the video here and using the ``continue`` keyword modify
+the ``for`` loop to print the squares of even numbers below 10, to
+print the squares of only multiples of 4. (Do not modify the range
+function call.) Then, resume the video. 
+::
+
+  for n in range(2, 10, 2):
+      if n%4:
+          continue      
+      print n*n
+
+That brings us to the end of this tutorial. In this tutorial, we have
+learnt about looping structures in Python and the use of the keywords
+``pass``, ``break`` and ``continue``. 
+
+Thank You!