Grouping
group_by with agg summarises columns.
What you will be able to do
- Use group_by.
- Aggregate with pl.len and pl.mean.
- Sort the result.
In plain English
group_by with agg summarises columns.
- Use group_by.
- Aggregate with pl.len and pl.mean.
- Sort the result.
print(df.group_by('course').agg(pl.col('minutes').mean()))Your turn
EasyExplain it back
Answer from memory: Which method groups rows?
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Knowledge checkQuestion 1
Which method groups rows?
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