Write code for following 1 create List 2 insert remove update the items from list

What Are Python Lists

In Python, a list is a data type, that stores a collection of different objects (items) within a square bracket([]). Each item in a list is separated by a comma(,) with the first item at index 0.

Table of Contents Show

What Are Python Lists
Characteristics Of Python List
Manipulating Python Lists
Frequently Asked Questions
List Methods in Python | Set 2 (del, remove(), sort(), insert(), pop(), extend()…)
Add items into the list:
Example 1: Insert item using insert() method
Example 2: Insert item using append() method
Example 3: Insert item using extend() method
Python List
Python List insert()
Python Lists and List Manipulation
Python lists

Note: Moving forward, all the examples in this tutorial will directly run from a Python shell, unless otherwise stated.

Below is an example of a list with 5 items.

>>> l = ['what','who','where','when','how'] >>>l ['what','who','where','when','how']

In the above example, we can see that the list has String objects as items, and each item is separated by a comma.

Characteristics Of Python List

Before we look at how we can manipulate items in a list, let’s look at some of the characteristics that make Python lists favored.

Python Lists Are Container Sequences

Unlike flat sequences(string, array.array, memoryview, etc) that can only hold items of one type, a list is a container sequence that can hold items of one type as well as of different types.

Example with items of one type

Let’s open our python shell and define a list of numbers.

>>> numbers = ['one','two','three','four','five'] >>> numbers ['one','two','three','four','five']

The example above shows a list of items of the same type, in this case of type string(str).

Example with items of different types

Let’s open our Python shell and define another version of a list of numbers.

>>> numbers = ['one',2,3,'four',5.0] >>> numbers ['one',2,3,'four',5.0]

The example above shows a list of items of different types. The types are string, integer, and float.

// a sketch showing the list of items and their types as annotation

The Python list can also hold all objects such as functions, classes, modules, lists, tuples, and much more.

Open an editor and paste the below code:

def test(): """This is a function""" print("This is a test") if __name__ == '__main__': print(test) # return instance object of function 'test' instance = type(test) print(instance) # create a list of colors colors = ["red","blue","green"] print(colors) # create a list holding all the various data types defined above, including boolean. my_list = [test, instance, colors, False] print(my_list)

Output

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Methods:

Many methods exist in Python to modify the list. Some common methods to add and remove data in the list are mentioned here.

insert (index,item): This method is used to insert any item in the particular index of the list and right shift the list items.

append (item): This method is used to add new element at the end of the list.

extend (anotherList): The items of one list can be inserted at the end of another list by using this method.

remove (item): This method is used to remove particular item from the list.

pop (index): The method is used to remove item from the list based on index value.

del(): This method is used to remove the particular item of the list or slice the list.

clear(): This method is used to remove all items of a list

Add items into the list:

Different ways to add items in Python list are shown in this part of the tutorial.

Example 1: Insert item using insert() method

Create a python file with the following script to see the use of insert() method. A new item will be inserted in the third position of the list and the other items will be shifted right after running the script.

# Declare list
listdata = [89, 56, 90, 34, 89, 12]

# Insert data in the 2nd position
listdata.insert(2, 23)

# Displaying list after inserting
print("The list elements are")

for i in range(0, len(listdata)):
print(listdata[i])

Output:

The following output will appear after running the script.

Example 2: Insert item using append() method

Create a python file with the following script to see the use of append() method. It is mentioned before that append() method inserts data at the end of the list. So, ‘Toshiba’ will be inserted at the end of listdata after running the script.

# Define the list
listdata = ["Dell", "HP", "Leveno", "Asus"]

# Insert data using append method
listdata.append("Toshiba")

# Display the list after insert
print("The list elements are")

for i in range(0, len(listdata)):
print(listdata[i])

Output:

The following output will appear after running the script.

Example 3: Insert item using extend() method

Create a python file with the following script to see the use of extend() method. Here, two lists are declared in the script which are combined together by using extend() method. The items of the second list will be added at the end of the first list.

# initializing the first list
list1 = ['html', 'CSS', 'JavaScript', 'JQuery']

# initializing the second list
list2 = ['PHP', 'Laravel', 'CodeIgniter']

# Combine both lists using extend() method
list1.extend(list2)

# Display the list after combing
print ("The list elements are :")

for i in range(0, len(list1)):
print(list1[i])

Output:

The following output will appear after running the script.

Python List

In this tutorial, we'll learn everything about Python lists: creating lists, changing list elements, removing elements, and other list operations with the help of examples.