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Python

Five larger exercises that each combine several earlier tracks. Give each state of an upload its own type, check a package's import rules, build an immutable order model from untrusted data, extend the worker pool to keep going after failures, and fix five performance problems in an order pipeline.

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5 exercises

1 article

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Your learning sequence

  1. 1 Before You Start a Capstone Read
  2. 2 Not solved yet. Capstone: Give Each Upload State Its Own Type Practice · Hard
  3. 3 Not solved yet. Capstone: Check a Package's Layer and Import Rules Practice · Hard
  4. 4 Not solved yet. Capstone: Build an Immutable Order Model from Untrusted Data Practice · Hard
  5. 5 Not solved yet. Capstone: Extend the Worker Pool to Keep Going After Failures Practice · Hard
  6. 6 Not solved yet. Capstone: Fix Five Performance Problems in an Order Pipeline Practice · Hard

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Why does the upload capstone use two classes, Draft and Sealed, instead of one class with an is_sealed flag?

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def checksum_of(sealed: Sealed) -> str:
    return sealed.digest

draft = begin("report")
checksum_of(draft)  # mypy: incompatible type "Draft"; expected "Sealed"
Question 1 of 2