3.4.2. Tidying up: going from long to wide using pivot
[ ] Oxford comma? We seem to generally be using it
[ ] We don't explain why we are renaming columns, so there is a mismatch between Fig 3.10 and what we show in the code. It might be worth a quick sentence on this
3.4.3. Tidying up: using str.split to deal with multiple separators
[ ] order of operations as described in the text doesn't match the code
3.7. Using iloc[] to extract rows and columns by position
[ ] minor suggestion for clarity
remember that Python starts counting at 0, so the second item "language" has index 1!
-->
remember that Python starts counting at 0, so the second column "language" has index 1!
3.9. Performing operations on groups of rows using groupby
[ ] Fig 3.13. Space missing after period "column for each summary statistic.The"
3.4.2. Tidying up: going from long to wide using pivot
3.4.3. Tidying up: using str.split to deal with multiple separators
3.7. Using iloc[] to extract rows and columns by position
3.9. Performing operations on groups of rows using groupby