How do I use groupby and agg in pandas?
You can use the groupby
method to group your data by one or more columns, and then apply the agg
function to perform aggregate operations.
Can you show me an example of that?
Sure! If you have a DataFrame df
with columns 'A' and 'B', you can do df.groupby('A').agg({'B': 'sum'})
to get the sum of 'B' for each group in 'A'.
What if I want to apply multiple aggregation functions?
You can pass a list of functions to agg
. For example, df.groupby('A').agg({'B': ['sum', 'mean']})
will give you both the sum and mean of 'B' for each group.
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