The best single stall result on each day — one number per row

NumPy · from Aggregation and the axis argument

.sum.mean.maxaxis=keepdims.argmax.cumsum

Putting the kettle on…

Starting up…

Exercise 2

The best single stall result on each day — one number per row.

your answer
stuck? the lesson behind it
Aggregation and the axis argument
The axis you name is the axis that disappears.