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Python pattern
Data-shape transforms
5 problems in this pattern, climbing easy → medium → hard. Pick wherever you're calibrated.
Easy
0 / 2 solved
Reshape long records into a wide nested dict
Python
· ~10 min
NEW
Pivot a long metrics table to wide
Python
· ~9 min
NEW
Medium
0 / 1 solved
Unpivot month columns to rows
Python
· ~10 min
NEW
Hard
0 / 2 solved
Pivot mean and count per metric into flat columns
Python
· ~15 min
NEW
Consolidate a wide monthly extract with gaps and duplicate rows
Python
· ~18 min
NEW