Python list functin append(), insert(), and extend()

 

Insert()

Definition and usage

The insert() function inserts the specified value at the specified position.

Syntax

List.insert(pos, elmnt)

Parameter Values

Parameter	Description
pos	Required. A number specifying in which position to insert the value
elmnt	Required. An element of any type (string, number, object etc.)

 

Insert the value “15” as the second element of the list.

Example 1

Li = [10,20,30,10,40]

Li.insert(1, 15)

Print (Li)

Output:           ’10,15,20,30,10,40’

Insert the value “Grapes” as the second element of the list.

Example 2

Li = [“apple”,”Orange”,”Banana”]

Li.insert(“1, Grapes”)

Print (Li)

Output:           ‘apple, Grapes, Orange, Banana’

append()

Definition and usage

The append() function appends an element to the end of the list.

Syntax

List.append(element)

Parameter Values

Any type(string, number, list, tuple, etc.)

Add an element to the list.

Example 1

a = [10,20,30,10,40]

a.append(50)

Print (a)

Output:           ’[10,20,30,10,40,50]’

Example 2

a = [“apple”,”Orange”,”Banana”]

a.index(“Kivi”)

Print (a)

Output:           ’[apple, Orange, Banana, Kivi]’

Add a list to a list.

Example 3

a = [“apple”,”Orange”,”Banana”]

b = [“10,20,30,40”]

a.index(b)

Print (a)

Output:           ’[apple, Orange, Banana,[10,20,30,40]]’

Add a tuple to a list.

Example 4

a = [“apple”,”Orange”,”Banana”]

b = (“10,20,30,40”)

a.index(b)

Print (a)

Output:           ’[apple, Orange, Banana,(10,20,30,40)]’

extend()

Definition and usage

The extend() function add the specified list elements (or any iterable) to the end of the current list.

Syntax

List.extend(element)

Parameter Values

Any type(iterable)

Add an element to the list.

Example 1

a = [10,20,30,40]

b = [50,60,70]

a.extend(b)

Print (a)

Output:           ’[10,20,30,40,50,60,70]’

Example 2

a = [“apple”,”Orange”,”Banana”]

b = [“Kiwi”,”Grapes”]

a.extend(b)

Print (a)

Output:           ’[apple, Orange, Banana, Kivi, Grapes]’

Example 3

a = [“apple”,”Orange”,”Banana”]

b = [“5,10,15,20”]

a.extend(b)

Print (a)

Output:           ’[apple, Orange, Banana, 5,10,15,20]’

Update any list:

For this method you can update any value.

Syntax

List [pos] = val

Parameter Values

Any type(pos)

Add an element to the list.

Example 1

a = [10,20,30,40]

a [0] = 5

Print (a)

Output:           ’[5,20,30,40]’

Example 2

a = [“apple”,”Orange”,”Banana”]

a [1] = “Kiwi”

Print (a)

Output:           ’[apple, Kiwi, Banana]’

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