beginner

Building Reusable Python Functions

Software Engineering

Trusted by learners working at top companies

Turn screen time into skills time

Practice anytime, anywhere with our mobile app.

Join the 1M+ learners on CodeSignal

Be a part of our community of 1M+ users who develop and demonstrate their skills on CodeSignal

Learn to write reusable Python functions: define and call them, pass data with parameters, return results, understand local scope, and compose functions into small working programs.

See courses

Earn a shareable

Certificate of Achievement

Verified skills you'll gain

DEVELOPING

General Programming and Algorithms

DEVELOPING

Software Development Practices

Tools you'll use

Python

Defining and Calling Python Functions

3 lessons

15 practices

Learn to define and call Python functions, reuse one function across many calls, and organize a script into several cooperating functions.

Course 2

Passing Data into Python Functions

4 lessons

17 practices

Add parameters to Python functions and pass arguments by position, by name, and with defaults so one definition can handle many inputs.

See details

Course 3

Returning Values and Understanding Scope in Python

4 lessons

20 practices

Return values from Python functions, understand local scope, chain functions into pipelines, and document each function's contract with docstrings.

See details

Course 4

Writing Complex Python Functions

6 lessons

29 practices

Write longer Python functions with conditionals, loops, and lists, then compose them into a small end-to-end data-processing workflow.

See details

From our community

Hear what our customers have to say about CodeSignal Learn

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.

Faith Yim

Software Engineer

+14

It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.

Alex Bush

Full Stack Engineer

I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.

Abbey Helterbran

Tech consultant

I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.

Jonathan Miller

Senior Machine Learning Engineer

+12

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

From our community

Hear what our customers have to say about CodeSignal Learn

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.

Faith Yim

Software Engineer

+14

It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.

Alex Bush

Full Stack Engineer

I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.

Abbey Helterbran

Tech consultant

I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.

Jonathan Miller

Senior Machine Learning Engineer

+12

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

Building Reusable Python Functions

Trusted by learners working at top companies

Turn screen time into skills time

Join the 1M+ learners on CodeSignal

Certificate of Achievement

Verified skills you'll gain

From our community

Other paths you may like

From our community