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Session 6 | Homework

In this homework, you will extend the Session 5 capstone project by adding controlled parallel video downloading.

1. Goal

You will:

  • revisit your Session 5 capstone repository
  • add 5 more short YouTube video URLs
  • limit parallel video downloads to 5 at a time
  • use a semaphore to coordinate shared result-file writing
  • record clear success/failure output for each video

2. Capstone repository

Use the separate capstone repository from Session 5:

BDA capstone 1

Do not write your capstone solution files in this weekly bda repository.

3. What to do

  1. Open your fork of the Session 5 capstone repository.
  2. Pull the latest changes from your fork.
  3. Find 5 additional short YouTube videos.
  4. Add the 5 new URLs to your capstone input list.
  5. Update your downloader so no more than 5 videos download at the same time.
  6. Use threading.Semaphore(5) or an equivalent semaphore to enforce the download limit.
  7. Use a semaphore or lock-style protected section when writing results to a shared results file.
  8. Record one result line per video:
    • URL
    • status (success or failed)
    • output filename or error message
    • timestamp
  9. Test your program with the expanded URL list.
  10. Commit and push your updated capstone work.

4. Suggested design

Use one semaphore for the download limit:

download_limit = threading.Semaphore(5)

Use another one-at-a-time guard for the shared results file:

result_file_guard = threading.Semaphore(1)

This is intentionally similar to a mutex. It allows exactly one worker to write to the file at a time.

5. File to submit in this repository

Create this file:

session6/solutions/exercise-06-homework.md

Your markdown file should include:

# Session 6 Homework

## Capstone repository

Link:

## New YouTube URLs

1.
2.
3.
4.
5.

## What I changed

Explain how you limited parallel downloads to 5.

## Semaphore design

Explain where you used the download semaphore and where you protected result-file writing.

## Result file format

Show 2-3 example result lines from your output file.

## Testing

Explain how you tested that only 5 downloads can run at once.

## Reflection

What was harder: limiting downloads or safely writing results? Why?

6. Rules

  • Use Python.
  • Use a semaphore for the parallel download limit.
  • Add exactly 5 additional short YouTube URLs.
  • Do not overwrite old capstone results without backing them up or clearly regenerating them.
  • Record failures instead of hiding them.
  • Keep your code readable enough for another student to follow.

7. Share your work

Post your completed session6/solutions/exercise-06-homework.md in the class discussion forum.

Use the MS Teams discussion forum:

MS Teams discussion forum

When you post, include:

  • your capstone repository link
  • your 5 new video URLs
  • a short explanation of your semaphore design