PYTHR/deployment/content/unit-4-troubleshooting/instructor-resources/19-unit-lab-4/19-lab-slides.md

Unit 4 Lab: Carefully Adding a Bit More Logic

---

Lesson Objectives

• Apply what you’ve learned in Unit 4 to create a working Python program.
• Wrap up Unit 4.
• Q&A and transition.

Talking Points:

• Congratulate students on finishing unit 4!

---

You Do: Unit 4 Lab — Troubleshooting

Do you remember the last unit lab? You added structure to your movie app using dictionaries and classes.

In today's lab, you will add error-checking, string formatting, and a while loop (but not an infinite one!), slightly restructuring the code as you go.

Open the unit-lab-4-directions file to see the lab and its instructions. Follow the instructions there.

• If your solution to the last lab didn't quite work, there's working code provided in the starter-code folder. Copy that to your local folder and work from there.

Try your best! Raise your hand if you really need help.

20 MINUTES

Teaching Tips:

• Make sure you change the link or point out what PDF to look at, and check the starter code location.
• Make sure all students start with working code — they can get it from the starter-code file.
• The lab has instructions and an explanation in it for students to read. Make sure they're all opening the lab instructions OK.
• Stay on this slide until everyone's done or time's up!

Talking Points:

• Remember that, throughout the course, there's a lab at the end of each unit. Each lab builds upon the last.
• Does anyone need help with the starter code?
• Right now, let's set up the functions and control flow to print out the values of our variables.

---

Debrief: Unit 4 Lab — Troubleshooting

How did it go?

Let's go over it.

Make sure you understand and that your code works — the Unit 5 lab builds off this one!

Talking Points:

• Bring up the solution (located in the solution-code directory) and walk students through it. Make sure everyone understands — and that everyone's code is accurate or they know that it isn't.
• The next lab builds off of this one but provides starter code if needed.

---

Unit 4 Wrap-Up

What did we cover?

• Variable scope: Using the global keyword to access global variables.
• The order of scope precedence that Python follows when resolving variable names.
• Creating floats and flooring division.
• Formatting strings.
• Troubleshooting common types of errors.
• Implement basic try/except mitigation.
• Adding print statements to help debugging.

Questions?

5 minutes

Teaching Tips:

• Briefly review the high-level learning objectives for Unit 4.
• As you read each bullet aloud, ask students to give you a "fist to five." See Talking Points below.
• Observe student votes for each item and make a mental note to follow up with individuals who are not feeling confident, or find time to reteach topics with which the majority of the class is uncomfortable.
• Take time to go over questions (but remember the parking lot).

Talking Points:

• Wow, we've covered a lot! Let's take a minute to review what we've learned so far.
• I'm going to read through the topics for Unit 4. As I do so, I want you to tell me how confident you feel that you've mastered each one, on a scale of 0 to 5.
  • Hold up your fist to indicate 0 — you don't feel confident at all that you mastered this objective.
  • Hold up all five fingers to indicate 5 — you feel super confident. You're an expert!