pyPython Practice LabFrom first print to final round
TOPIC 09 OF 18

Files, Exceptions, and Modules Python lessons

Reading and writing text data, handling predictable failures, imports, and safe input boundaries.

10 exercises8+ conceptsBeginner → interview context
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WHAT YOU WILL LEARN

Core concepts

Count lines, words, and charactersTotal values from CSV rowsExtract error log entriesReplace a word in textDivide safely with exceptionsValidate integer inputParse key-value configurationSummarize JSON orders
REUSABLE THINKING

Problem-solving patterns

  • text file · statistics
  • csv · module
  • logs · filtering
  • replace · text processing
  • try except · ZeroDivisionError
LESSON OUTCOME

What this topic builds

Learn the idea once, trace it through two verified cases, then explain why your approach works.

ORDERED LESSONS

All 10 lessons in this topic

Work from top to bottom to build each concept gradually.

  1. #067
    Count lines, words, and characters

    Compute basic statistics for text that could have been read from a file.

    StarterPremium
  2. #068
    Total values from CSV rows

    Calculate the total value of three CSV order rows.

    StarterPremium
  3. #069
    Extract error log entries

    Extract only ERROR records from a mixed log.

    BeginnerPremium
  4. #070
    Replace a word in text

    Replace every old environment name in a line.

    BeginnerPremium
  5. #071
    Divide safely with exceptions

    Safely divide two valid numeric inputs.

    BeginnerPremium
  6. #072
    Validate integer input

    Accept a valid signed integer from a form field.

    BeginnerPremium
  7. #073
    Parse key-value configuration

    Parse and alphabetize a small configuration block.

    IntermediatePremium
  8. #074
    Summarize JSON orders

    Summarize quantity and value from an API-style JSON response.

    IntermediatePremium
  9. #075
    Calculate days between dates

    Find the number of days between project start and finish dates.

    IntermediatePremium
  10. #076
    Count file extensions

    Count extensions in a small project folder listing.

    AdvancedPremium