Loops and Formatted Printing

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Week 3 syllabus map

• L3.1: Introduction
• L3.2: Introduction to while loop
• L3.3: while to compute factorial
• L3.4: Tutorial on while loop
• L3.5: Introduction to for loop
• L3.6: for loop to add the first n numbers
• L3.7: for loop for multiplication tables
• L3.8: More on range and for loop without range
• L3.9: Formatted printing
• L3.10: Tutorial on for loop and difference between while loop and for loop
• L3.11: Nested for loop
• L3.12: Tutorial on nested loops
• L3.13: break, continue and pass
• L3.14: Conclusion

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Week 3 lecture pages

1. L3.1: Introduction
2. L3.2: Introduction to while loop
3. L3.3: While to Compute Factorial
4. L3.4: Tutorial on while loop
5. L3.5: Introduction to for loop
6. L3.6: for loop to add the first n numbers
7. L3.7: for loop for multiplication tables
8. L3.8: More on range and for loop without range
9. L3.9: Formatted Printing
10. L3.10: Tutorial on for loop and difference between while loop and for loop
11. L3.11: Nested for loop
12. L3.12: Tutorial on nested loops
13. L3.13: break, continue and pass
14. L3.14: Conclusion

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30-minute pacing suggestion per lecture

• 0-8 min: concept and syntax
• 8-18 min: dry runs and step-by-step trace
• 18-25 min: exam traps and error patterns
• 25-30 min: quick practice + answer check

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Week 3 exam traps (must master)

• infinite while loop due to missing update
• off-by-one boundaries in while and for
• confusion between range(n), range(1, n), and range(1, n + 1)
• confusing while and for use-cases
• nested-loop indentation and variable shadowing mistakes
• factorial base case (0! = 1)
• misunderstanding break vs continue vs pass
• using + for strings vs numbers in formatted printing
• wrong alignment/width in f-strings (:>, :<, :^)

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Final revision checklist

• can trace loop variables manually
• can predict output without running code
• can convert simple while logic to for and vice versa
• can write table output with clean formatting
• can explain why a loop stops