The most important collection data type in Python is the
list data type. You’ll use lists basically in all your future projects so take 3-5 minutes and study this short guide carefully.
You can also play my short video tutorial as you read over the methods:
|Appends element |
|Removes all elements from the list |
|Returns a copy of the list |
|Counts the number of occurrences of element |
|Adds all elements of an iterable |
|Returns the position (index) of the first occurrence of value |
|Inserts element |
|Removes and returns the final element of the list |
|Removes and returns the first occurrence of element |
|Reverses the order of elements in the list |
|Sorts the elements in the list |
Let’s dive into a couple of examples:
l =  l.append(2) print(l) l.clear() print(l) l.append(2) print(l) print(l.copy()) print(l.count(2)) l.extend([2,3,4]) print(l) print(l.index(3)) l.insert(2, 99) print(l) print(l.pop()) l.remove(2) print(l) l.reverse() print(l) l.sort() print(l)
Puzzle: Can you figure out all outputs of this interactive Python script?
Before you read on, first figure out the outputs. Then, compare them with the results here:
    1 [2, 2, 3, 4] 2 [2, 2, 99, 3, 4] 4 [2, 99, 3] [3, 99, 2] [2, 3, 99]
If you’ve studied the table carefully, you’ll know the most important list methods in Python. Let’s have a look at some examples of above methods:
>>> l =  >>> l.append(2) >>> l  >>> l.clear() >>> l  >>> l.append(2) >>> l  >>> l.copy()  >>> l.count(2) 1 >>> l.extend([2,3,4]) >>> l [2, 2, 3, 4] >>> l.index(3) 2 >>> l.insert(2, 99) >>> l [2, 2, 99, 3, 4] >>> l.pop() 4 >>> l.remove(2) >>> l [2, 99, 3] >>> l.reverse() >>> l [3, 99, 2] >>> l.sort() >>> l [2, 3, 99]
- Have a look at the ultimate guide of Python lists.
- Master Python Sets (with Harry Potter Examples)
- Master Python Dictionaries (the ultimate blog tutorial)
- Join my free email computer science academy for continuous improvement in Python
Here’s your free PDF cheat sheet showing you all Python list methods on one simple page. Click the image to download the high-resolution PDF file, print it, and post it to your office wall:
While working as a researcher in distributed systems, Dr. Christian Mayer found his love for teaching computer science students.
To help students reach higher levels of Python success, he founded the programming education website Finxter.com. He’s author of the popular programming book Python One-Liners (NoStarch 2020), coauthor of the Coffee Break Python series of self-published books, computer science enthusiast, freelancer, and owner of one of the top 10 largest Python blogs worldwide.
His passions are writing, reading, and coding. But his greatest passion is to serve aspiring coders through Finxter and help them to boost their skills. You can join his free email academy here.