FAQ: Working with Lists in Python - Removing by Index: Pop

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This community-built FAQ covers the “Removing by Index: Pop” exercise from the lesson “Working with Lists in Python”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Data Scientist
Analyze Data with Python
Computer Science
Analyze Financial Data with Python
Build Chatbots with Python
Build Python Web Apps with Flask
Data Analyst

Learn Python 3
CS101 Livestream Series

FAQs on the exercise Removing by Index: Pop

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2

Which is better to use, .remove() or .pop()? Which is better to use in certain projects and problems?

1 Like
3

The .pop method returns the object you are removing from your list. So, if you need that object then use pop; otherwise you can just remove it.

2 Likes
4

Worth adding in here that .pop is designed to act on a specific index of your list e.g. lst.pop(10) would pop the 11th element from the list; whereas .remove is designed to remove a specific value rather than an index e.g. lst.remove("Marius") to remove the first element that matches the value "Marius".

Since their arguments differ you’d likely be using them at different times for that reason too.

4 Likes
5

When I removed the items by using .pop but then also add them to a new variable, Algorithm shows up as 3Algorithm.
This is what I wrote:

removed_classes = data_science_topics.pop()

removed_classes += data_science_topics.pop(3)

print(data_science_topics)

print(removed_classes)

This is what showed up:
[‘Machine Learning’, ‘SQL’, ‘Pandas’, ‘Statistics’]
Python 3Algorithms

6

It’s not that Algorithms is showing up as 3Algorithms. It’s “Python 3” followed by “Algorithms” with no space between.

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data_science_topics.pop()

data_science_topics.pop(3)

print(data_science_topics)

8

What is “pop” short for?