Extend vs Append. I looked at the basic difference.

#python #programming

Extend adds multiple elements to the list, while append adds just one element to the list.

I was unable to study on October 27th.

Day 68 [October 28, 2025]

I need to buckle down, as I'm still lagging on day day 3 & 4 goals, "Day 3-4: Control structures (if-else, loops)", as well as day 5 (and 6) goals, "Day 5-6: Functions and modules", and Day 7 target (exercises) (Meta AI, personal communication, August 8, 2025). If I haven't covered this, I can't make progress on day 8 - 67 goals.

Goals:
As extracted from the 'Python for Software Development' textbook by Halvorsen (n.d.):

Plotting in Python ✅
Subplots✅
Exercises✅
If ... Else
Arrays
For Loops
Nested
For Loops
While Loops
Exercises
Creating Functions in Python - Introduction
Functions with multiple return values
Exercises
Creating Classes in Python
The init () Function
Exercises
Creating Python Modules
Exercises

Notes:
Python for Data Science, AI & Development Course (IBM) (Santarcangelo, n.d.):
Module 2: Python Data Structures

Lists and Tuples
Dictionaries
Sets

Lists
Extend vs Append

Extend adds multiple elements to the list, while append adds just one element to the list, as explained below

Extend:
shopping_list = ["Watch", "Laptop","Shoes","Pen", "Clothes"] #list excerpted basically from Santarcangelo (n.d.)
shopping_list.extend(["Football", "Phone"])
shopping_list
Outputs:
['Watch', 'Laptop', 'Shoes', 'Pen', 'Clothes', 'Football', 'Phone']

shopping_list = ["Watch", "Laptop","Shoes","Pen", "Clothes"] #list excerpted basically from Santarcangelo (n.d.)
shopping_list.extend("Football") #notice no list within the parenthesis
shopping_list
Outputs:
['Watch', 'Laptop', 'Shoes', 'Pen', 'Clothes', 'F', 'o', 'o', 't', 'b', 'a', 'l', 'l']

Append:
shopping_list = ["Watch", "Laptop","Shoes","Pen", "Clothes"] #list excerpted basically from Santarcangelo (n.d.)
shopping_list.append(["Football", "Phone"])
shopping_list
Outputs:
['Watch', 'Laptop', 'Shoes', 'Pen', 'Clothes', ['Football', 'Phone']] #append adds just one element to the list

shopping_list = ["Watch", "Laptop","Shoes","Pen", "Clothes"] #list excerpted basically from Santarcangelo (n.d.)
shopping_list.append("Football") #notice no list within the parenthesis
shopping_list
Outputs:
['Watch', 'Laptop', 'Shoes', 'Pen', 'Clothes', 'Football'] #append adds just one element to the list

Summary:
Extend vs Append. I looked at the basic difference. Extend adds multiple elements to the list, while append adds just one element to the list.

References: