Python Tutorial

• Python Add PYTHONPATH
• Python Code Blocks and Indentation
• Python Comment
• Python Variable
• Python Data Type
• Python Type Conversion and Casting
• Python Input and Output
• Python Operator
• Python Iterator
• Python Generator

Python Flow Control

• Python if else
• Python for Loops
• Python while Loops
• Python break Statement
• Python continue Statement
• Python pass Statement
• Python switch Statement

Python Functions

• Python Function
• Python Recursion
• Python Anonymous/Lambda Function
• Python Modules
• Python Package

Python Data Types

• Python Number
• Python String
• Python List
• Python Tuple
• Python Set
• Python Dictionary

Python Date and Time

• Python datetime
• strftime(): from datetime to readable string
• strptime(): read string to datetime
• Get current date and time
• Make a time delay
• Convert between local time and UTC time
• Get whole program execution time
• Iterate through a range of dates
• Get the last day of month
• Add/subtract a day
• Convert seconds to HH:MM:SS

Python Files

• Python Open and Close File
• Python Read File
• Python Write File
• Python Move File
• Python Remove File and Directory
• Read Write CSV file
• Read Write JSON file
• Zip File and Directory
• List all files of a directory
• List all sub-directories of directory
• Check a file or directory exists
• Create a directory safely
• Get current directory and file path
• Read big file
• Web page and file download over HTTP
• Search and replace a line to file
• Get file modification time
• Read specific lines from a file by line number
• Check file size
• Get filename and extension

Python String

• String updating, replacing and deleting
• Formatting of Strings
• String format converting
• Convert ASCII string
• String Escape Sequencing
• String lower and upper case
• Find substring in a string
• Count all occurrences of a substring
• Compare two strings
• Split a string into a list
• Split strings into words with multiple delimiters
• Extract numbers from a string
• Conbine items in a list to a single string
• Put a int variable inseide a string
• Compare string in case insensitive
• Check if multiple strings exist in another string
• Check if string exists in a list of strings
• Generate random string
• Remove trailing whitespace in strings

Python List

• List items Adding
• List items Accessing
• List items removing
• List items modifying
• List items iterating
• List items sorting
• List Comprehension
• Convert string representation of list to a list
• Clone a list
• Rotate a list
• Remove duplicates from list
• Define a two-dimensional array
• Sort a list of lists by value
• Sort list based on values from another list
• Sort a list of objects by an attribute of the objects
• Split a list into evenly sized chunks
• Creare a flat list out of a nested list
• Get all possible combinations of a list's elements
• Get the Cartesian product of a series of lists
• Find the index of an element in a list
• Concatenate two list
• Count the occurrences of a list item
• Transpose list of lists
• Find the difference between two lists
• Select items from list randomly
• Iterate a list as (current, next) pair
• Shuffle a list
• Find the cumulative sum of numbers in a list
• Get unique values from a list
• Generate all permutations of a list
• Find the intersection between two lists
• Find the duplicates in a list
• Check item in list
• Convert a list to a string
• Find the average of a list
• Alternate combine two lists
• Extract specific element from each sublist

Python Dictionary

• Add and Modify Dictionary elements
• Delete elements from Dictionary
• Sort dictionary by key
• Sort dictionary by value
• Combine and merge dictionaries
• Convert a String representation of a Dictionary to a dictionary
• Get key by value in dictionary
• Copy a dictionary and edit the copy only
• Create dictionary with dict comprehension and iterables
• Get key with maximum value in dictionary
• Make dictionary from list
• Filter dictionary to contain specific keys

Python Variable

• Python Global Variables and Global Keyword
• Python Local and Nonlocal Variables
• Python Static Class variables
• Create variable variables
• Create variables dynamically in while loop
• Test Single Variable in Multiple Values
• Swap two variables
• Set a Python variable to 'undefined'
• Set and access environment variables

Python Input/Output

• Formatting Output
• Interactive Input/Output
• Indefinitely Request User Input Until a Valid Response
• Read user input as number
• Pretty print JSON
• Print number

Python Exceptions

• Python Exception and Error
• Python AssertionError
• Python AttributeError
• Python EOFError
• Python FloatingPointError
• Python GeneratorExit
• Python ImportError and ModuleNotFoundError
• Python IndexError
• Python KeyError
• Python MemoryError
• Python NameError
• Python OverflowError
• Python TypeError

Python Advanced

• Access the index in for loops
• Change index of a for loop
• ** operator in a function call
• * operator in a function call
• Sort a list of tuples by value
• Transpose list of tuples
• Calculate Euclidean distance btween two points
• Resize an image and keep its aspect ratio
• Check number
• Generate random integers

Python List Items Adding

In this Python tutorial, we will cover different ways to add items to a list. We will focus on the following methods:

1. append()
2. extend()
3. insert()
4. Using the + operator
5. Using the * operator

1. append()

The append() method adds an item to the end of a list.

Example:

my_list = [1, 2, 3]
my_list.append(4)

print(my_list)  # Output: [1, 2, 3, 4]

2. extend()

The extend() method adds multiple items to a list by extending it with another iterable (e.g., list, tuple, string).

Example:

my_list = [1, 2, 3]
my_list.extend([4, 5, 6])

print(my_list)  # Output: [1, 2, 3, 4, 5, 6]

3. insert()

The insert() method adds an item to a list at a specified index. The first argument is the index where you want to insert the item, and the second argument is the item itself.

Example:

my_list = [1, 2, 4]
my_list.insert(2, 3)  # Insert the number 3 at index 2

print(my_list)  # Output: [1, 2, 3, 4]

4. Using the + operator

You can use the + operator to concatenate two lists, which creates a new list with the combined elements.

Example:

list1 = [1, 2, 3]
list2 = [4, 5, 6]

combined_list = list1 + list2

print(combined_list)  # Output: [1, 2, 3, 4, 5, 6]

5. Using the * operator

You can use the * operator to create a new list by repeating the elements of an existing list a specified number of times.

Example:

my_list = [1, 2, 3]

repeated_list = my_list * 3

print(repeated_list)  # Output: [1, 2, 3, 1, 2, 3, 1, 2, 3]

In this tutorial, you learned different ways to add items to a Python list, including using the append(), extend(), and insert() methods, as well as the + and * operators.

1. Appending elements to a list in Python:

   • Description: Appending involves adding a single element to the end of a list.
   • Example Code:

     my_list = [1, 2, 3]
     my_list.append(4)
     print(my_list)  # Output: [1, 2, 3, 4]
     

2. Extend list in Python with new items:

   • Description: The extend() method is used to add multiple elements from an iterable to the end of a list.
   • Example Code:

     my_list = [1, 2, 3]
     new_elements = [4, 5, 6]
     my_list.extend(new_elements)
     print(my_list)  # Output: [1, 2, 3, 4, 5, 6]
     

3. Inserting items into a specific position in a list in Python:

   • Description: The insert() method allows you to add an element at a specific position in the list.
   • Example Code:

     my_list = [1, 2, 3, 5]
     my_list.insert(3, 4)
     print(my_list)  # Output: [1, 2, 3, 4, 5]
     

4. Concatenate lists in Python:

   • Description: Concatenation involves combining two or more lists into a single list.
   • Example Code:

     list1 = [1, 2, 3]
     list2 = [4, 5, 6]
     concatenated_list = list1 + list2
     print(concatenated_list)  # Output: [1, 2, 3, 4, 5, 6]
     

5. Using the '+' operator to add elements to a list in Python:

   • Description: The + operator can be used for list concatenation, similar to the extend() method.
   • Example Code:

     my_list = [1, 2, 3]
     my_list = my_list + [4, 5, 6]
     print(my_list)  # Output: [1, 2, 3, 4, 5, 6]
     

6. Appending multiple elements to a list in one go in Python:

   • Description: Appending multiple elements involves using the += operator or extend() method.
   • Example Code:

     my_list = [1, 2, 3]
     my_list += [4, 5, 6]
     print(my_list)  # Output: [1, 2, 3, 4, 5, 6]
     

7. Adding elements to a list using list comprehension in Python:

   • Description: List comprehension is a concise way to add elements to a list based on a condition.
   • Example Code:

     my_list = [x for x in range(5)]
     print(my_list)  # Output: [0, 1, 2, 3, 4]
     

8. Updating a list with new items in Python:

   • Description: Updating involves modifying existing elements or adding new elements to a list.
   • Example Code:

     my_list = [1, 2, 3, 4]
     my_list[2] = 5
     print(my_list)  # Output: [1, 2, 5, 4]