The document discusses various operations that can be performed on lists in Python. It includes: 1. Creating a list, accessing list items using indexes, adding and removing items to update lists, and deleting lists. 2. Examples of built-in list methods like sort(), count(), pop(), and operations like concatenation using +. 3. Justifications for lists being mutable - that list items can be changed in place and accessed using indexes. It then provides examples of Python programs to: sum all items in a list, multiply all items, find the largest/smallest item, reverse a list, find common items between two lists, and select even items from a list.

1. Write simple Python program to perform
following operations on List:Create
list,Access list,update list(add and remove
item),delete list
PRACTICAL NO 6

2. 1. When to used list
List is used to save a collection of values of same
type in a variable and list support indexing.

3. 2. Describe various list function.

4. 3. Write a syntax for a method to sort a list.

5. 4.Write a syntax for a method to count occurences
of a list item in python.

6. 5.How to concatenate list
 The '+' operator can be used to concatenate two
lists. It appends one list at the end of the other list
and results in a new list as output.
 Syntax
List3=List1+List2

7. 6. Justify the statement “List are mutable”
 The value of any element inside the List can be
changed at any point of time.
 The Elements of the List are accessible with their
index value.The index always start with 0 and ends
with n-1,if the list contains n elements.
 Example
List1=[10,20,30,40]
List1[2]=50
print(List1)
Output
[10, 20, 50, 40]

8. 7. Describe the use of pop operator in list
If we know the index of the element that we want to
delete ,then we can use pop statement.
For Example
list=[10,20,30,40]
list.pop(3)
print(list)
output
[10, 20, 30]

9. 1. Write a python program to sum all the items in a
list.
l=[6,4,9,7,3]
sum=0
for i in l:
sum=sum+i
print("Sum of elements ",l," is ",sum)
Output
Sum of elements [6, 4, 9, 7, 3] is 29

10. 2. Write a python program to multiplies all the items
in a list
l=[2,5,3,1]
sum=1
for i in l:
sum=sum*i
print("Multiplies of elements ",l," is ",sum)
Output
Multiplies of elements [2, 5, 3, 1] is 30

11. 3. Write a program to get the largest number from
list
l=[2,6,98,7,67,1,9,54]
m=0
for i in l:
if(m<i):
m=i
print("LARGEST eLEMENT IN THE lIST=",m)
Output
LARGEST eLEMENT IN THE lIST= 98

12. 4. Write a program to get the smallest number
from list
l=[2,6,98,7,67,1,9,54]
m=l[0]
for i in l:
if(m>i):
m=i
print("SMALLEST ELEMENT=",m)
Output
SMALLEST ELEMENT= 1

13. 5. Write a program to reverse a list.
l1=[1,2,3,4,5]
print("Before reversing ",l1)
l1.reverse()
print("After reversing ",l1)
Output
Before reversing [1, 2, 3, 4, 5]
After reversing [5, 4, 3, 2, 1]

14. 6. Write a program to find common items from two list
l1=[2,5,3,8,9]
l2=[4,1,2,6,8]
l=len(l1)
print("common elements ARE ")
for i in range(0,l):
for j in range(0,l):
if(l1[i]==l2[j]):
print(l1[i])
Output
common elements ARE
2
8

15. 7. Write a program to select the even items of a list.
l=[3,2,5,6,4,8]
print("Are the even numbers from the list")
for i in l:
if(i%2==0):
print(i)
Output
Are the even numbers from the list
2
6
4
8

16. End