LIST OPERATIONS
===============

Counting the number of Occurrences of the specified element:
============================================================
[1,2,3,4,1,2,3,4,1,1,2,2,3,3,4]
==> 1 ==> 4
==> 2 ==> 4
==> 3 ==> 4
==> 4 ==> 3

count():
========
1) is an inbuilt method
2) use to count the number of occurrences of the specified element.
Syntax:
	list-object.count(list-element)
3) count() can return an integer, which describe the number of occurrences, if the specified element in in the given list.
4) if the specified element is not in the given list: count() can return a zero.

# count()

listData = [1,2,3,4,1,1,2,2,3,3,4]

cnt1 = listData.count(1)
cnt2 = listData.count(2)
cnt3 = listData.count(3)
cnt4 = listData.count(4)
cnt5 = listData.count(5)

print(cnt1);print(cnt2);print(cnt3);print(cnt4);print(cnt5) 

====================================

Find the first occurrence (index) of the element in the list:
=============================================================
[1,2,3,4,1,2,3,4,4,3,2,1]
4 is at:
	3rd index
	7th index
	8th index

index():
========
use to get the first occurrence/index (if the element is at multiple places) of the specified element in a list.

Syntax:
	list-object.index(list-element)

can return: an index value, if the specified element is in the given list
can return a Value error:, if the specified element is not in the given list.
index() can also use to find the element within the specified range also.
Syntax:
	list-object.index(list-element, s-index, e-index)

# index()

ld = [1,2,3,4,4,3,2,1,1,2,3,4]

index = ld.index(4)
# i1 = ld.index(5)
# i1 = ld.index(4,5,10)
i1 = ld.index(2,4,10)

print(index)
print(i1)
====================================================
Adding of element at last in the list:
======================================
[1,2,3,4]
add '5' at the end
[1,2,3,4,5]

append():
=========
1) is an inbuilt method
2) can use to add an element at the end of the list
Syntax:
	list-object.append(element/value)

# WAP TO CREATE THE LIST WITH ONLY EVEN NUMBERS FROM 1 TO 30.

# Solution-1:

listData = list(range(2,30,2))

print("The list with only even integers = ",listData)

# solution-2:

ld = list()

for i in range(1,30):
    if i % 2 == 0:
        ld.append(i)

print("The List With only Even numbers is = ",ld)

=====================================================

Insertion/Adding of an element to the list at the specified position/index:
===========================================================================
[1,2,3,4]

append(5) ==> [1,2,3,4,5]

insert 5 ==> [1,2,5,3,4]

insert():
========
Syntax:
	list-data.insert(index/position, value/element)

Returning value of insert() ==> None
if the specified index is out of range:
	insert() can insert an element at the end by default.

# insert()

ld = eval(input("Enter a list:"))

print("Before the insertion:")
print(ld)

print(ld.insert(3,97))
ld.insert(10,79)

print("After the insertion:")
print(ld)

===============================================

EXTENDING OF ONE LIST DATA TO ANOTHER LIST DATA:
================================================
[1,2,3,4]
[5,6,7,8]

extending ==> [1,2,3,4,5,6,7,8]
[5,6,7,8,1,2,3,4]

extend()
========
Syntax:
	list-object1.extend(list-object2)

# extend()

ld1 = eval(input("Enter a list:"))
ld2 = eval(input("Enter a list:"))

print("Before the extend operation:")
print(ld1)
print(ld2)

ld1.extend(ld2)

print("After the extend Operation:")
print(ld1)
print(ld2)

=============================================

Removal of specific element from the list:
==========================================
remove():
========
Syntax:
	list-object.remove(list-element)

=> remove() can return: None
=> if the specified element is not in the list:
	remove() can return: value Error

# remove()

ld = [1,3,5,7,9,10,30,50,70,90]

print("The List Before the remove is = ")
print(ld)

print(ld.remove(30))
# print(ld.remove(100))

print("The List After the remove is = ")
print(ld)

Note:
====
If the specified element is duplicated:
	remove() can remove the value from first occurrence/index.

===============================================

Removing the Last element from the list:
========================================
pop():
=====
Syntax:
	list-object.pop()

1) if a list is an empty:
	pop() can return: "Index Error"
2) if a list with something:
	pop() can remove the last element, by default.
3) pop() can return the value which is deleting from the list.

# pop()

ld = []
ld1 = [1,3,5,7,9,11,13,15]

print(ld);print(ld1)

# ld.pop()

# print(ld)

print(ld1.pop())
ld1.pop()

print(ld1)
==================================

del property:
=============
which we can use to delete the whole data or the individual data from collection.

to delete the specific element from list:
Syntax:
	del list-data[index]

to delete the whole list:
Syntax:
	del list-data-name

Note:
====
after the delete operation, if the list data is accessing:
	del property ==> name error.
# del property

ld = eval(input("Enter a list"))

print("The List Before delete operation:")
print(ld)

del ld[3]

print("The List After the delete operation:")
print(ld)

del ld

# print(ld)

================================================

Clearing of the whole list:
===========================
clear()
=======
Syntax:
	list-data.clear()

# clear()

ld = eval(input("Enter a list:"))

print("The List before the clear operation is:")
print(ld)

ld.clear()

print("The List after the clear operation is:")
print(ld)