What this snippet does
ChainMap groups multiple dictionaries together for fast lookups without copying data.
Expected output
2
Why practise typing this
Typing standard library (collections) 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
- Config LayeringStandard Library (Collections) · intermediate
- ChainMap MutateStandard Library (Collections) · intermediate
- Ordered DictStandard Library (Collections) · intermediate
- Move To EndStandard Library (Collections) · intermediate
- Equality CheckStandard Library (Collections) · intermediate
- Dynamic TypingVariables & Types · beginner