.max()

The .max() method produces a new Series or DataFrame with maximum values for the groups in a GroupBy object.

Syntax

groupbyobject.max(numeric_only, min_count)

The .max() method has the following parameters:

• numeric_only: Boolean value. True includes only int, float, and boolean columns. Default value is True.
• min_count: Int value. Required number of valid entries in order to produce a result. Default value is 0.

Example

The following example produces a GroupBy object from a DataFrame and executes the .max() method on it.

import pandas as pd

df = pd.DataFrame({'Key' : ['A', 'A', 'A', 'B', 'B', 'C'],
                   'Value' : [15., 23., 17., 5., 8., 12.]})
print(df, end='\n\n')

group = df.groupby(['Key'], as_index=False)

print(group.max())

This example produces the following output:

  Key  Value
0   A   15.0
1   A   23.0
2   A   17.0
3   B    5.0
4   B    8.0
5   C   12.0

  Key  Value
0   A   23.0
1   B    8.0
2   C   12.0