List in python

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List in the Python is a collection and can be used to store with dynamic size.
List is orderd and changable in nature.
List can be declared as following and the all items of the list can be printed with single print command.

myList=["India","Pakistan","USA"]
print(myList)

Output:
[‘India’, ‘Pakistan’, ‘USA’]

Here output elements are ordered and printed as they are stored.

Access an element of List.

myList=["India","Pakistan","USA"]
myList[2]="Russia" # this line changes the value "USA" to "Russia"
print(myList[2]) #This is how we can print only specific position element of List.

Output:
Russia

To Display all elements of List for loop can also be used

myList=["India","Pakistan","USA"]
for i in myList:
 print(i)

Output:
India
Pakistan
USA

Important operations that can also be implemented on List

1) append(): this appends the given element at the last of the list.

myList=["India","Pakistan","USA"]
myList.append("UK")
print(myList)

Output:
[‘India’, ‘Pakistan’, ‘USA’, ‘UK’]

2) insert(): this method insert the given element at given index of the list.

myList=["India","Pakistan","USA"]
myList.insert(1,"UAE")
print(myList)

Output:
[‘India’, ‘UAE’, ‘Pakistan’, ‘USA’]

3) remove(): this removes the given element from the list.

myList=["India","Pakistan","USA"]
myList.remove("Pakistan")
print(myList)

Output:
[‘India’, ‘USA’]

4) del(): this can delete the specific position element or the complete list

myList=["India","Pakistan","USA"]
del(myList[1])
print(myList)

Output:
[‘India’, ‘USA’]

myList=["India","Pakistan","USA"]
del(myList)
print(myList)

Output:
error as list is no more.

5) reverse(): This reverse the elements of the list

myList=["India","Pakistan","USA"]
myList.reverse()
print(myList)

Output:
[‘USA’, ‘Pakistan’, ‘India’]

6) clear(): It removes all the elements from the list.

myList=["India","Pakistan","USA"]
myList.clear()
print(myList)

Output: No Elements

7) pop(): It gives the last element of the list as in Stack.

myList=["India","Pakistan","USA"]
print(myList.pop())

Output: USA

8) sort(): this arranges the elments of a list in an order . By default it arranges in ascending order.

myList=["India","Pakistan","USA"]
myList.sort()
print(myList)
#to arrange in reverse order
myList.sort(reverse=True)
print(myList)

Output: [‘India’, ‘Pakistan’, ‘USA’]

[‘USA’, ‘Pakistan’, ‘India’]

9) index: This returns the imndex of the given element in the list.

myList=["India","Pakistan","USA"]
print(myList.index('Pakistan'))

Output:
1 (index of element in list).

10) len(): This gives the length of the List.

myList=["India","Pakistan","USA"]
print(len(myList))

Output:3

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List in Python

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