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Coding · Grade 7

Structured Input and Validation

Learners discover why programs must check input, using a coding-club sign-up form that keeps crashing. They classify presence, type, range, length and format checks, write checks with string methods, build validation loops that re-ask until input is valid, handle conversion errors with try and except, and choose normal, boundary and invalid test data.

  • 4 lessons
  • About 85 minutes
  • Check what you learned: 8 questions
  • Ways to answer: fill in the blanks, choose an answer, put code in order, trace code, sort into groups and true or false
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What learners will discover

  • Explain why input is validated and classify presence, type, range, length and format checks.
  • Write validation checks using strip(), isdigit(), len() and range comparisons in a safe order.
  • Use a validation loop and try/except to handle invalid input without crashing.
  • Choose normal, boundary and invalid test data with expected outcomes for a validation rule.

Lessons

  1. Why programs check their input 5 steps2 practiceabout 18 min
  2. Writing validation checks 6 steps4 practiceabout 22 min
  3. Re-asking and handling errors 6 steps3 practiceabout 22 min
  4. Choosing test data for validation 5 steps2 practiceabout 16 min
  5. Check what you learned 8 questions at the end

Keep exploring

Games to practice with

  • Bug DetectiveA robot program almost works. Run it, spot the buggy block, and fix it.
  • Sorting FactoryTurn a work order into if/else rules and watch the conveyor sort every item.
  • Garden AutomationProgram a garden robot with sensor rules — then watch a whole day play out.

More 7th grade coding

Guide for grown-ups