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Lists and Tuples
Lesson 3 of 7

Python List Methods

Explore all the essential methods for manipulating Python lists. Learn how to add, remove, sort, and search elements with clear examples..

Table of Contents

Common List Methods

  • append(item) – Adds an item to the end
  • insert(index, item) – Adds item at specific index
  • remove(item) – Removes the first matching item
  • pop(index) – Removes item at given index (default is last)
  • sort() - Sort the list

Adding Elements to a List

You can add elements to a list using methods like append() or insert().

 
fruits = ['Apple', 'Banana', 'Mango', 'Orange']
 
# Append an element to the end of the list
fruits.append("Grape")
print(fruits)  # Output: ['Apple', 'Banana', 'Mango', 'Orange', 'Grape']
 
# Insert an element at a specific position
fruits.insert(1, "Orange")
print(fruits)  # Output: ['Apple', 'Orange', 'Banana', 'Mango', 'Orange', 'Grape']

Removing Elements from a List

Elements can be removed from a list using methods like remove(), pop(), or del.

# Remove a specific element by value
fruits.remove("Banana")
print(fruits)  # Output: ['Apple', 'Orange', 'Mango', 'Orange', 'Grape']
 
# Remove last element by using pop
fruits.pop() # Output: ['Apple', 'Orange', 'Mango', 'Orange']
 
# Remove an element by index using pop
fruits.pop(1)
print(fruits)  # Output:  ['Apple', 'Mango', 'Orange']

📺 Video Tutorial: Adding and Removing Elements from a Python List

This video covers:

  • ✔️ Adding elements to a list using the append [00:22] and insert [00:35] methods.
  • ✔️ Comparing the performance of append and insert [00:52].
  • ✔️ Removing elements from a list using the remove [01:24] and pop [01:45] methods.
  • ✔️ Demonstrating how pop removes and returns elements [01:50], including the last item when no index is specified [02:34].

{% assign video_type = "video" %} {% assign video_id = "x98wvk-4MHw" %} {% include youtube-video.html video_type=video_type video_id=video_id %}

📺 Python Tutorial in Urdu: List pop() Method

This video covers:

  • ✔️ A list of colors as an example [00:00].
  • ✔️ The pop method removes the last item in a list by default and displays it [00:38].
  • ✔️ Remove an item at a specific index by specifying it in the pop method [00:46].

{% assign video_type = "video" %} {% assign video_id = "S6HkdH4Xnog" %} {% include youtube-video.html video_type=video_type video_id=video_id %}

Sorting Elements in a List

You can sort elements in a list using the sort() method.

numbers = [3, 1, 4, 1, 5, 9, 2, 6, 5]
fruits = ['Apple', 'banana', 'Mango', 'orange']
 
# Sort a list in ascending order (modifies the original list)
numbers.sort()
print(numbers)  # Output: [1, 1, 2, 3, 4, 5, 5, 6, 9]
 
# Sort a list in descending order
numbers.sort(reverse=True)
print(numbers)  # Output: [9, 6, 5, 5, 4, 3, 2, 1, 1]
 
# Case-sensitive sort (ASCII order: uppercase comes before lowercase)
fruits.sort()
print(fruits)  # Output: ['Apple', 'Mango', 'banana', 'orange']

For more details on sorting, see Sorting Techniques in Python - Sorting How To

Example: Real-World Uses of Python List Common Methods: Managing Tasks & Organizing Data

1. append(item) – Adding a new task to a to-do list

  • Scenario: You have a to-do list, and you want to add a new task at the end.
  • Code Example: 
    todo_list = ["Buy groceries", "Finish report"]
todo_list.append("Call mom")
print(todo_list)  # Output: ["Buy groceries", "Finish report", "Call mom"]

2. insert(index, item) – Adding an emergency task at a specific position

  • Scenario: Your to-do list has tasks, but an urgent meeting comes up, so you insert it at the top.
  • Code Example: 
    todo_list = ["Buy groceries", "Finish report"]
todo_list.insert(0, "Attend emergency meeting")
print(todo_list)  # Output: ["Attend emergency meeting", "Buy groceries", "Finish report"]

3. remove(item) – Removing a completed task

  • Scenario: You finished "Buy groceries," so you remove it from the list.
  • Code Example: 
    todo_list = ["Buy groceries", "Finish report", "Call mom"]
todo_list.remove("Buy groceries")
print(todo_list)  # Output: ["Finish report", "Call mom"]

4. pop(index) – Removing the last task (or a specific one)

  • Scenario: You decide to drop the last task (or a task at a given position).
  • Code Example: 
    todo_list = ["Finish report", "Call mom", "Pay bills"]
last_task = todo_list.pop()  # Removes & returns "Pay bills"
print(todo_list)  # Output: ["Finish report", "Call mom"]
 
# Removing a task at index 0
first_task = todo_list.pop(0)  # Removes & returns "Finish report"
print(todo_list)  # Output: ["Call mom"]

5. sort() – Sorting a list of names alphabetically

  • Scenario: You have a list of attendees for an event and want to sort them alphabetically.
  • Code Example: 
    attendees = ["Zara", "Alice", "Bob", "Eve"]
attendees.sort()
print(attendees)  # Output: ["Alice", "Bob", "Eve", "Zara"]

Tasks

Task 1: Using List Methods

Write a Python program that:

  • Creates a list of three programming languages.
  • Adds a new language using append().
  • Inserts another language at the second position using insert().
  • Removes the last language using pop().
  • Prints the final list.

Example Output:

Initial List: ['Python', 'Java', 'C++']
After Append: ['Python', 'Java', 'C++', 'JavaScript']
After Insert: ['Python', 'Ruby', 'Java', 'C++', 'JavaScript']
After Pop: ['Python', 'Ruby', 'Java', 'C++']

Task 2: Adding to a List

Write a Python program that:

  • Creates an empty list.
  • Asks the user to enter three city names and adds them to the list.
  • Prints the final list.

Example Input:

Enter a city: Paris  
Enter a city: London  
Enter a city: Tokyo

Example Output:

Cities: ['Paris', 'London', 'Tokyo']

Include Error Handling Tips

  • Mention common mistakes (e.g., IndexError when accessing out-of-range indices).
  • Suggest using len(list) to check list length.

Example Addition:

colors = ["red", "blue"]
try:
    print(colors[2])  # Raises IndexError
except IndexError:
    print("Index out of range!")

More Methods

Index() Method - To find the position of the first occurrence

Further reading

References

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