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Coding · Grade 10

Files, Data Validation and Errors

Using athletics results files, learners read and write text files safely with with and in-memory file objects, validate every record for field count, type and range while logging rejects with line numbers, handle exceptions precisely with try, except, else and finally, and assemble a robust read-validate-process-report pipeline whose summary never hides rejected data.

  • 4 lessons
  • About 90 minutes
  • Check what you learned: 8 questions
  • Ways to answer: choose an answer, put code in order, trace code, put in order, sort into groups and true or false
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What learners will discover

  • Read and write text files safely, stripping, splitting and converting each line's fields.
  • Validate records for field count, type and range, raising specific errors and logging rejects with line numbers.
  • Handle exceptions precisely with specific except blocks, else and finally, avoiding bare excepts.
  • Build a read-validate-process-report pipeline that reports rejected data honestly.

Lessons

  1. Reading and writing files 6 steps3 practiceabout 20 min
  2. Validating records 5 steps3 practiceabout 22 min
  3. Exceptions in depth 5 steps3 practiceabout 22 min
  4. A robust pipeline end to end 4 steps3 practiceabout 20 min
  5. Check what you learned 8 questions at the end

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