(i) pop() function: pope () function can also be used to delete an element using the given index value. pop () function deletes and returns the last element of a list if the index is not given
(ii) clear ( ) function: The function clear( ) is used to delete all the elements in list, it deletes only the elements and retains the list.

Syntax:
Lise Variable [index of an element] = Value to be changed
Lise Variable [index from: index to] = Values to be changed

(i) Mylist contains another list as an element. This type of list is known as "Nested List': Nested list is a list containing another list as an element.
(ii) Example: Mylist = [ "Welcome", 3.14, 10, [2,4,6] ]

(i) In Python, a set is another type of collection data type. A'Set is a mutable and an unordered collection of elements without duplicates.
(ii) That means the elements within a set cannot be repeated. This feature used to include membership testing and eliminating duplicate elements. 

Syntax:
# Tuple with n number elements
Tuple_Name (E1, E2, E3.......En)
# Elements of a tuple without parenthesis
Tuple_Name = El, E2, E3 ................. En

(i) To delete an entire tuple, the del command can be used.
(ii) Syntax: del tuple_name
(iii) Example:
Tup1 = (2, 4, 6, 8, 10)
print("The elements of Tup1 is ", Tup 1)
del Tup1
print (Tup 1)

(i) The len( ) function in Python is used to find the length of a list. (i.e., the number of elements in a list).
(ii) Usually, the len( ) function is used to set the upper limit in a loop to read all the elements of a list.
(iii) If a list contains another list as an element, len( ) returns that inner list as a single element.
(iv) Example: Accessing single element
> > > MySubject = ['Tamil', 'English', 'Comp', 'Science', 'Maths']
> > > len(MySubject)
4

(i) List is an ordered set of elements. But, a dictionary is a data structure that is used for matching one element (Key) with another (Value).
(ii) The index values can be used to access a particular element. But, in dictionary key represents index. Remember that, key may be a nunmber of a string.
(iii)  Lists are used to look up a value whereas a dictionary is used to take one value and look up another value.

Set Operations :
(i) Union : It includes all elements from two or more sets.
(ii) Intersection : It includes the common elements in two sets.
(iii) Difference : It includes all elements that are in first set (say set A) but not in the second set (say set B).
(iv) Symmetric difference : It includes all the elements that are in two sets (say sets A and B) but not the one that are common to two sets.

remove ( ):
(i) The remove( ) function can also be used to delete one or more elements if the index value is not known.
(ii) Syntax:
List.remove(element) # to delete a particular element
(iii) Example:
> > > MyList= [12,89,34,'Kannan', 'Gowri sankar', 'Lenin']
> > > print(MyList)
[12, 89, 34, 'Karman', 'Gowrisankar', 'Lenin')
> > > MyList.remove(89)
> > > print(MyList)
[12, 34, 'Karman', 'Gowrisankar', 'Lenin']
pop ():
(i) pop() function can also be used to delete an element using the given index value. pope ) function deletes and returns the last element of a list if the index is not given.
(ii) pop() function is used to delete a particular element using its index value, as soon as the element is deleted.
(iii) The pop( ) function shows the element which is deleted. pope ) function is used to delete only one element from a list. Remember that, del statement deletes multiple elements.
(iv) Syntax: List.pop(index of an element)
(v) Example:
> > > MyList.pop(1)
34
> > > print(MyList)
[12, 'Kannan', 'Gowrisankar', 'Lenin')
clear ():
(i) The function clear( ) is used to delete all the elements in list, it deletes only the elements and retains the list
(ii) clear() function removes only the elements and retains the list. When you try to print the list which is already cleared, an empty square bracket is displayed without any elements, which means the list is empty.
(iii) Syntax:
List.clear( )
Example:
> > > MyList.clear( )
> > > print(MyList)
[ ]

In Python, a tuple can be defined inside another tuple; called Nested tuple. In a nested tuple, each tuple is considered as an element. The for loop will be useful to access all the elements in a nested tuple.
Example:
Toppers = (("Vinodini", "XII-F", 98.7), ("Soundarya", "XII-H", 97.5),
("Tharani", "XII-F", 95.3), ("Saisri", "XII-G", 93.8))
for i in Toppers:
print(i)
Output:
('Vinodini', 'XII-F', 98.7)
('Soundarya', 'XII-H', 97.5)
('Tharani', 'XII-F', 95.3)
('Saisri', 'XII-G', 93.8)