CS 111: Introduction to Computer Science

Spring 2026

Instructors:

Section 1 (MTWTh 9:30am) - Tom Stephens (email: tstephen@cs.byu.edu)
- Office Hours: Schedule a time: https://calendly.com/byu-cs-tstephen/office-hours

Students from Fall 2025 or Earlier
If you are viewing this site to look at the prior forms of the assignments, please head to the course archives to find the content. This website no longer links to all of those assignments directly.

Week's Lecture Topics & Slides	Date	Readings	Lab Links	Homework & Project Due Dates / Test Dates
Week 1
Lecture 2 - Errors & Introduction to Testing (why, TDD)	Mon Apr 27	Errors Reading Quiz Testing Intro Reading Quiz File I/O Reading Quiz List Basics Reading Quiz Slicing Reading Quiz Strings Reading Quiz For Loops Reading Quiz Free Coding Project - Overview
Lecture 0 - Course Introduction	Tue Apr 28	How to Navigate Canvas / Gradescope Syllabus Reading Quiz Disabling AI Tools	Getting Started and Python Setup Lab	First Day of Classes
Lecture 1 - Computational Thinking & Writing Quality Code	Wed Apr 29	Code Quality Guidelines Python Basics Reading Quiz Console I/O Reading Quiz Booleans and Conditionals Reading Quiz While Loops Reading Quiz Functions Reading Quiz	Booleans and Conditionals Lab While Loops Lab Functions Lab
	Thu Apr 30		File I/O Lab List Basics Lab Strings Lab Slicing Lab For Loops Lab Errors Lab	Homework 00 - Pizza!
	Fri May 1
Week 2
Lecture 3 - Environments and Debugging	Mon May 4	Debugging Reading Quiz	Debugging Lab
Lecture 4 - Testing and Writing Tests	Tue May 5	pytest Reading Quiz doctest Reading Quiz	pytest Lab doctest Lab	Homework 01 - College Admissions Algorithms University Add/Drop Deadline
Lecture 5 - Strings, Lists, Dictionaries & Tuples, Slicing & Comprehensions	Wed May 6	Tuples Reading Quiz Dictionaries Reading Quiz Comprehensions Reading Quiz	Dictionaries Lab Tuples Lab Comprehensions Lab
Lecture 6 - Images	Thu May 7	Images Reading Quiz	Images Lab
	Fri May 8		Progress Check 1	Homework 02 - Image Manipulation
Week 3
Lecture 7 - Abstraction & Command Line Arguments	Mon May 11	Abstraction Reading Quiz Command Line Arguments Reading Quiz	Command Line Arguments Lab	Free Coding Project - Proposal
Lecture 8 - Big O, Algorithm Analysis, Data Structures	Tue May 12	Big O Reading Quiz		Project 01 - Image Processing Skill Assessment 1
Lecture 9 - Object Oriented Programming & Class Design	Wed May 13	OOP Reading Quiz Classes Reading Quiz	Classes Lab	Skill Assessment 1
Lecture 10 - Inheritance & Interfaces	Thu May 14	Inheritance Reading Quiz Interfaces Reading Quiz	Inheritance Lab Interfaces Lab Polymorphism Lab
	Fri May 15			Homework 03 - The Grid Class
Week 4
Lecture 11 - Dunder Functions & Polymorphism	Mon May 18	Dunder Functions Reading Quiz Polymorphism Reading Quiz	Dunder Functions Lab
Lecture 12 - Modularity, Modular Design & Random Numbers	Tue May 19	Random Numbers Reading Quiz	Random Numbers Lab	Project 02 - Falling Sand Simulation
Lecture 13 - Lambda Expressions & Higher Order Functions	Wed May 20	Lambda Functions Reading Quiz Higher Order Functions Reading Quiz	Lambda Functions Lab Higher Order Functions Lab
Lecture 14 - Composition, Decorators, & Mutability	Thu May 21	Review Syllabus Reading Quiz	Progress Check 2
	Fri May 22
Week 5
	Mon May 25
	Tue May 26	Memorial Day Holiday
Lecture 16 - Linked Lists	Wed May 27	Linked Lists Reading Quiz	Linked Lists Lab	Skill Assessment 2
Lecture 17 - Tree Recursion	Thu May 28	Tree Recursion Reading Quiz Merge Sort Reading Quiz	Tree Recursion Lab
	Fri May 29			Homework 04 - Merge Sort
Week 6
Lecture 18 - Trees	Mon Jun 1	Trees Reading Quiz	Trees Lab	Free Coding Project - Implementation
Lecture 19 - Backtracking	Tue Jun 2	Backtracking Reading Quiz	Progress Check 3 Backtracking Lab
Lecture 20 - Programming Languages & Regular Expressions	Wed Jun 3	Regex Reading Quiz	Regex Lab
Lecture 21 - HTML, Requests, and Beautiful Soup	Thu Jun 4	Intro to WWW Reading Quiz HTML Tags and Attributes Reading Quiz	HTML Tags and Attributes Lab	Project 03 - Recursive Backtrace Mazes
	Fri Jun 5			Skill Assessment 3
Week 7
Lecture 22 - Hyperlinks and robots.txt	Mon Jun 8	Hyperlinks Reading Quiz robots.txt Reading Quiz	Hyperlinks Lab
Lecture 23 - Web Scraping	Tue Jun 9	Web Scraping Reading Quiz	Web Scraping Lab	Homework 05 - Robots
Lecture 24 - Data Visualization	Wed Jun 10	Data Visualization Reading Quiz	Data Visualization Lab
Lecture 25 - Conclusion	Thu Jun 11
	Fri Jun 12		Progress Check 4	Project 04 - Webcrawler Skill Assessment 4
Week 8
	Mon Jun 15	Last Day of Classes
	Tue Jun 16	Exam Prep Day / Reading Day
	Wed Jun 17	Finals Week - Check your schedule for specific exam times
	Thu Jun 18	Finals Week - Check your schedule for specific exam times
	Fri Jun 19	Summer Break starts (for real this time)!