## Exercise: Python List Comprehension (3 levels)

### Level 1 - Basic (Remember/Understand)
Convert this for loop to a list comprehension:
​```python
result = []
for x in range(10):
    result.append(x * 2)
# Answer: result = [x * 2 for x in range(10)]
​```

### Level 2 - Intermediate (Apply)
Filter and transform: get squares of even numbers from 1-20.
​```python
# Answer: squares = [x**2 for x in range(1, 21) if x % 2 == 0]
​```

### Level 3 - Advanced (Analyze)
Flatten a 2D matrix and explain when NOT to use list comprehension.
​```python
matrix = [[1,2,3], [4,5,6], [7,8,9]]
# Answer: flat = [num for row in matrix for num in row]
# Avoid when: nested comprehensions reduce readability (3+ levels)
​```

## Slide Deck: Introduction to REST APIs (45 min)

| Slide | Content | Duration | Activity |
|-------|---------|----------|----------|
| 1-3   | What is REST? Core principles | 10 min | Discussion: APIs you use daily |
| 4-6   | HTTP methods and status codes | 10 min | Quiz: match method to operation |
| 7-9   | Designing resources and URLs | 10 min | Exercise: design a bookstore API |
| 10-12 | Authentication and error handling | 10 min | Live demo with curl |
| 13    | Summary and next steps | 5 min | Q&A |