What this snippet does
Before Self, typing classmethods returning instances required complex TypeVars bound to the base class.
Expected output
Derived
Why practise typing this
Typing advanced typing (3.11+) code builds muscle memory for the symbols and indentation Python uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More Python practice
- Self TypeAdvanced Typing (3.11+) · advanced
- Builder SelfAdvanced Typing (3.11+) · advanced
- Never TypeAdvanced Typing (3.11+) · advanced
- Exhaustive CheckAdvanced Typing (3.11+) · advanced
- Assert NeverAdvanced Typing (3.11+) · advanced
- Dynamic TypingVariables & Types · beginner