diff -r 000a414fc3b7 -r dbc118349011 basic_python/list_tuples.rst
--- a/basic_python/list_tuples.rst	Thu Aug 20 04:21:45 2009 +0530
+++ b/basic_python/list_tuples.rst	Thu Aug 20 19:53:56 2009 +0530
@@ -177,7 +177,7 @@
 
 
 None, Empty Lists, and Initialization
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+-------------------------------------
 
 An *Empty List* is a *List* with no elements and is simply represented as
 []. A *None List* is one with all elements in it being **None**. It serves
@@ -191,3 +191,163 @@
   >>> n
   [None, None, None, None, None, None, None, None, None, None]
 
+
+Nested Lists
+------------
+
+As mentioned earlier, a List can contain elements of any data type. This also
+implies a *List* can have a *Lists* themselves as its elements. These are 
+called as *Nested Lists*. There is no limit on the depth of the *Nested Lists*::
+
+  >>> a = [1, [1, 2, 3], 3, [1, [1, 2, 3]], 7]
+
+
+List Methods
+------------
+
+A method is a function that is coupled to an object. More about objects
+and its methods are discussed in Advanced Python module. In general, a
+method is called like::
+
+  object.method(arguments)
+
+For now, it is enough to know that a list of elements is an object and
+so *List* methods can be called upon them. Also some of the methods change
+the *List* in-place, meaning it modifies the existing list instead of creating
+a new one, while other methods don't. It must be noted as we run through
+the *List* methods.
+
+Some of the most commonly used *List* methods are as follows:
+
+
+append
+~~~~~~
+
+The *append* method is used to append an object at the end of the list::
+
+  >>> prime = [2, 3, 5]
+  >>> prime.append(7)
+  >>> prime
+  [2, 3, 5, 7]
+
+It is important to note that append changes the *List* in-place.
+
+
+count
+~~~~~
+
+The *count* method returns the number of occurences of a particular element
+in a list::
+
+  >>> [1, 4, 4, 9, 9, 9].count(9)
+  3
+  >>> tlst = ['Python', 'is', 'a', 'beautiful', 'language']
+  >>> tlst.count('Python')
+  1
+
+
+extend
+~~~~~~
+
+The *extend* method extends the list on which it is called by the list supplied
+as argument to it::
+
+  >>> a = [1, 2, 3]
+  >>> b = [4, 5, 6]
+  >>> a.extend(b)
+  [1, 2, 3, 4, 5, 6]
+
+This is an in-place method. This method is equivalent to using the + operator, but
+using the + operator returns a new list.
+
+
+index
+~~~~~
+
+The *index* method returns the index position of the element in the list 
+specified as argument::
+
+  >>> a = [1, 2, 3, ,4, 5]
+  >>> a.index(4)
+  3
+
+
+insert
+~~~~~~
+
+The *insert* method is used to insert an element specified as the second 
+argument to the list at the position specified by the first argument::
+
+  >>> a = ['Python', 'is', 'cool']
+  >>> a.insert(2, 'so')
+  >>> a
+  ['Python', 'is', 'so', 'cool']
+
+The *insert* method changes the *List* in-place.
+
+
+pop
+~~~
+
+The *pop* method removes an element from the list. The index position
+of the element to be removed can be specified as an argument to the
+*pop* method, if not it removes the last element by default::
+
+  >>> a = [1, 2, 3, 4, 5]
+  >>> a.pop()
+  >>> a
+  5
+  >>> a.pop(2)
+  >>> a
+  3
+
+The *pop* method changes the *List* in-place.
+
+
+remove
+~~~~~~
+
+The *remove* method removes the first occurence of an element supplied as a
+parameter::
+
+  >>> a = [1, 2, 3, 4, 2, 5, 2]
+  >>> a.remove(2)
+  >>> a
+  [1, 3, 4, 2, 5, 2]
+
+
+reverse
+~~~~~~~
+
+The *reverse* method reverses elements in the list. It is important to note
+here that *reverse* method changes the list in-place and doesn't return any
+thing::
+
+  >>> a = ['guido', 'alex', 'tim']
+  >>> a.reverse()
+  >>> a
+  ['tim', 'alex', 'guido']
+
+
+sort
+~~~~
+
+The *sort* method is used to sort the elements of the list. The *sort* method
+also sorts in-place and does not return anything::
+
+  >>> a = [5, 1, 3, 7, 4]
+  >>> a.sort()
+  >>> a
+  [1, 3, 4, 5, 7]
+
+In addition to the sort method on a *List* object we can also use the built-in
+**sorted** function. This function takes the *List* as a parameter and returns
+a sorted copy of the list. However the original list is left intact::
+
+  >>> a = [5, 1, 3, 7, 4]
+  >>> b = sorted(a)
+  >>> b
+  [1, 3, 4, 5, 7]
+  >>> a
+  [5, 1, 3, 7, 4]
+