Python Lists in Action – Change, Modify & Update Data!
In Python, lists are one of the most powerful and flexible data structures. Unlike tuples, which are immutable, lists are mutable, meaning you can modify them after creation. This makes lists essential for handling dynamic data, allowing you to add, remove, update, and manipulate elements efficiently.
Understanding Lists in Python
A list is an ordered collection of elements enclosed in square brackets []. Lists can contain elements of different data types, including integers, strings, floats, or even other lists.
Example of a list:
fruits = ["apple", "banana", "cherry"]
Each element in the list is assigned an index starting from 0.
Modifying Lists in Python
Python allows direct modification of list elements using indexing. Since lists are mutable, we can replace, update, or delete elements as needed.
1. Updating Elements in a List
To change an element in a list, assign a new value to a specific index:
fruits[1] = "orange"
print(fruits) # Output: ['apple', 'orange', 'cherry']
This replaces "banana" with "orange" at index 1.
2. Adding Elements to a List
Python provides multiple ways to add new elements:
append() – Adds an item to the end of the list:
fruits.append("grape")
print(fruits) # Output: ['apple', 'orange', 'cherry', 'grape']
insert() – Inserts an item at a specific position:
fruits.insert(1, "mango")
print(fruits) # Output: ['apple', 'mango', 'orange', 'cherry']
3. Removing Elements from a List
Python provides various methods to delete items from a list:
remove(value) – Deletes the first occurrence of a value:
fruits.remove("orange")
print(fruits) # Output: ['apple', 'mango', 'cherry']
pop(index) – Removes an item by index (default is last item):
fruits.pop(2)
print(fruits) # Output: ['apple', 'mango']
del statement – Deletes an element or the entire list:
del fruits[1] # Removes the second element
del fruits # Deletes the entire list
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Chapters:
00:00 Introduction
00:19 Problem statement
00:36 Indices of elements
00:48 Writing the code
01:33 Running the code
01:43 Modifying the elements further
02:15 Running the code one more time
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