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

How to Remove duplicates from list in Python

There are several ways to remove duplicates from a list in Python. Here are a few common methods:

• Using a set (unordered, faster): If the order of the elements doesn't matter, you can remove duplicates by converting the list to a set and then back to a list. Sets don't allow duplicates, so this will give you a new list with unique elements.

original_list = [1, 2, 2, 3, 4, 4, 5]
unique_list = list(set(original_list))
print(unique_list)

• Using a list comprehension (ordered, slower): If you want to maintain the order of the elements, you can use a list comprehension with a helper set to track the unique elements encountered.

original_list = [1, 2, 2, 3, 4, 4, 5]
unique_list = []
unique_set = set()

for item in original_list:
    if item not in unique_set:
        unique_list.append(item)
        unique_set.add(item)

print(unique_list)

• Using a list and an OrderedDict (ordered, faster for larger lists): For larger lists, you can use an OrderedDict from the collections module to maintain the order of unique elements efficiently.

from collections import OrderedDict

original_list = [1, 2, 2, 3, 4, 4, 5]
unique_list = list(OrderedDict.fromkeys(original_list).keys())
print(unique_list)

Choose the method that best suits your needs, depending on whether you need to maintain the order of the elements and the size of the list.

1. Python remove duplicates from list:

   • Description: Removing duplicates from a list using the set() method.
   • Code:

     original_list = [1, 2, 2, 3, 4, 4, 5]
     unique_list = list(set(original_list))
     print("Original List:", original_list)
     print("List with Duplicates Removed:", unique_list)
     

2. Remove duplicate elements in Python list:

   • Description: Removing duplicate elements from a list using the set() method.
   • Code:

     original_list = [1, 2, 2, 3, 4, 4, 5]
     unique_list = list(set(original_list))
     print("Original List:", original_list)
     print("List with Duplicates Removed:", unique_list)
     

3. Python list unique elements:

   • Description: Obtaining unique elements from a list using the set() method.
   • Code:

     original_list = [1, 2, 2, 3, 4, 4, 5]
     unique_elements = set(original_list)
     print("Original List:", original_list)
     print("Unique Elements:", list(unique_elements))
     

4. Delete duplicate items in Python list:

   • Description: Deleting duplicate items from a list using a loop and a new list.
   • Code:

     original_list = [1, 2, 2, 3, 4, 4, 5]
     unique_list = []
     [unique_list.append(item) for item in original_list if item not in unique_list]
     print("Original List:", original_list)
     print("List with Duplicates Removed:", unique_list)
     

5. Deduplicate list in Python:

   • Description: Deduplicating a list using a loop and a new list.
   • Code:

     original_list = [1, 2, 2, 3, 4, 4, 5]
     unique_list = []
     [unique_list.append(item) for item in original_list if item not in unique_list]
     print("Original List:", original_list)
     print("List with Duplicates Removed:", unique_list)
     

6. Python set to remove duplicates from list:

   • Description: Using the set() method to remove duplicates from a list.
   • Code:

     original_list = [1, 2, 2, 3, 4, 4, 5]
     unique_list = list(set(original_list))
     print("Original List:", original_list)
     print("List with Duplicates Removed:", unique_list)
     

7. List comprehension to remove duplicates in Python:

   • Description: Using list comprehension to create a new list without duplicates.
   • Code:

     original_list = [1, 2, 2, 3, 4, 4, 5]
     unique_list = [item for index, item in enumerate(original_list) if item not in original_list[:index]]
     print("Original List:", original_list)
     print("List with Duplicates Removed:", unique_list)
     

8. Remove repeated elements from list in Python:

   • Description: Removing repeated elements from a list using a loop and a new list.
   • Code:

     original_list = [1, 2, 2, 3, 4, 4, 5]
     unique_list = []
     [unique_list.append(item) for item in original_list if original_list.count(item) == 1]
     print("Original List:", original_list)
     print("List with Repeated Elements Removed:", unique_list)
     

9. Eliminate duplicates from list Python:

   • Description: Eliminating duplicates from a list using the set() method.
   • Code:

     original_list = [1, 2, 2, 3, 4, 4, 5]
     unique_list = list(set(original_list))
     print("Original List:", original_list)
     print("List with Duplicates Eliminated:", unique_list)
     

10. Unique elements in Python list:

    • Description: Obtaining unique elements from a list using the set() method.
    • Code:

      original_list = [1, 2, 2, 3, 4, 4, 5]
      unique_elements = set(original_list)
      print("Original List:", original_list)
      print("Unique Elements:", list(unique_elements))