Python List

A List is a collection of data, which store the collection of data in a single variable and provide various methods for data manipulation. such as sorting, update, insert, delete, etc. This section of the tutorial you will learn about Python List.


Objectives

  • Python List Syntax

  • Create and assign value in List

  • Python List Access elements

  • List data manipulations

  • Python List all methods and it’s task


Python List Syntax

list_data = ["value", "other value"]
Here

  • Values should be comma-separated into the square brackets.

  • Allow Duplicates


Create and assign value in Python List

# Define a list
mix_list = []

# Assign value to a list
mix_list = ["Touhid Mia", 28, True, 28.5]


Python List Access elements

This part you are going to learn access list elements using various way, let’s jump into the codes.

Common List

# Declare List for access data element
list_data = ["Touhid Mia", "Bangladesh", 28, 5.10, True]


Access element by index

Code

# Access element by index
name = list_data[0]
print(name)

Output

Touhid Mia

Process finished with exit code 0


Access element by negative index

Code

# Access element by negative index
last_item = list_data[-1]
print(last_item)

Output

True

Process finished with exit code 0

Note : Negative index means start from end of the list


Access multiple element by range of index

Code

# Access multiple element by range of index
multiple_item = list_data[1:3] # [start:end]
print(multiple_item)

Output

['Bangladesh', 28]

Process finished with exit code 0

Note : Range syntax is [start_index : end_index]


Access multiple element by range of index (without end)

Code

# Access multiple element by range of index (without end)
multiple_item = list_data[1:]
print(multiple_item)

Output

['Bangladesh', 28, 5.1, True]

Process finished with exit code 0

Note : You know that, range syntax is [start_index : end_index] , if end_index not specified it will pick value start_index to last index


Access multiple element by range of index (without start)

Code

# Access multiple element by range of index (without start)
multiple_item = list_data[:3]
print(multiple_item)

Output

['Touhid Mia', 'Bangladesh', 28]

Process finished with exit code 0

Note : If you not specify start_index then it will start from beginning


Access multiple element by range of negative index

Code

# Access multiple element by range of negative index
multiple_item = list_data[-3:-1]
print(multiple_item)

Output

[28, 5.1]

Process finished with exit code 0


Check list value is exist on it

Code

# Check list value is exist on it
if "Bangladesh" in list_data:
    print("Yes key exist")
else:
    print("Key not exist")

Output

Yes key exist

Process finished with exit code 0


Print each element of list by loop

Code

# Declare List for access data element
list_data = ["Touhid Mia", "Bangladesh", 28, 5.10, True]

# Print each element of list by loop
for item in list_data:
    print("Item : " + str(item))

Output

Item : Touhid Mia
Item : Bangladesh
Item : 28
Item : 5.1
Item : True

Process finished with exit code 0


Python List data manipulations

Earlier part you saw that how to retrieve or access element from a list, this part you will learn how to add, remove, update data to list

Common List

# Declare List for access data element
list_data = ["Touhid Mia", "Bangladesh", 28, 5.10, True]


List add item using append function

Code

# List add item using append function
list_data.append("I have a child as well")
print(list_data)

Output

['Touhid Mia', 'Bangladesh', 28, 5.1, True, 'I have a child as well']

Process finished with exit code 0


List add item into specific index using insert function

Code

# List add item into specific index using insert function
list_data.insert(5, "I have a beautiful wife")
print(list_data)

Output

['Touhid Mia', 'Bangladesh', 28, 5.1, True, 'I have a beautiful wife', 'I have a child as well']

Process finished with exit code 0


Merge 2 list

Code

# Merge 2 list
primary_color = ["Red", "Yellow", "Blue"]
secondary_color = ["Orange", "Green", "Violet"]


print(">>> Before extend Secondary color")
print(primary_color)

primary_color.extend(secondary_color)
print(">>> After extend Secondary color")
print(primary_color)

Output

>>> Before extend Secondary color
['Red', 'Yellow', 'Blue']
>>> After extend Secondary color
['Red', 'Yellow', 'Blue', 'Orange', 'Green', 'Violet']

Process finished with exit code 0


Update list item using index

Code

# Update list item using index
list_data[0] = "Mia Bhai"
print(list_data)

Output

['Name', 'Country', 'Bangladesh', 28, 5.1, True, 'I have a beautiful wife', 'I have a child as well']

Process finished with exit code 0


Update list multiple item using index

Code

# Update list multiple item using index
list_data[0:1] = ["Name", "Country"]
print(list_data)

Output

['Name', 'Country', 'Bangladesh', 28, 5.1, True, 'I have a beautiful wife', 'I have a child as well']

Process finished with exit code 0


Remove List Item using name

Code

# Existing List
list_data = ["Touhid Mia", "Bangladesh", 28, 5.10, True]

# Remove List Item using name
list_data.remove("Bangladesh")
print(list_data)

Output

['Touhid Mia', 28, 5.1, True]

Process finished with exit code 0


Remove List Item using Specified Index by pop function

Code

# Existing List
list_data = ["Touhid Mia", "Bangladesh", 28, 5.10, True]

# Remove List Item using Specified Index by pop function
list_data.pop(0)
print(list_data)

Output

['Bangladesh', 28, 5.1, True]

Process finished with exit code 0


Remove List last item by pop function

Code

# Existing List
list_data = ["Touhid Mia", "Bangladesh", 28, 5.10, True]

# Remove List last item by pop function
list_data.pop()
print(list_data)

Output

['Touhid Mia', 'Bangladesh', 28, 5.1]

Process finished with exit code 0


Remove list all item using clear function

Code

# Existing List
list_data = ["Touhid Mia", "Bangladesh", 28, 5.10, True]

# Remove list all item using clear function
list_data.clear()
print(list_data)

Output

[]

Process finished with exit code 0


Python List all methods and it’s task

  • append() : Adds an element at the end of the list

  • count() : Returns the number of elements with the specified value

  • index() : Returns the index of the first element with the specified value

  • pop() : Removes the element at the specified position

  • copy() : Returns a copy of the list

  • insert() : Adds an element at the specified position

  • remove() : Removes the item with the specified value

  • extend() : Add the elements of a list (or any iterable), to the end of the current list

  • clear() : Removes all the elements from the list

  • reverse() : Reverses the order of the list

  • sort() : Sorts the list


Python List video tutorial

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