# ColumnGroups¶

class astropy.table.ColumnGroups(parent_column, indices=None, keys=None)[source]

Bases: astropy.table.groups.BaseGroups

Attributes Summary

Methods Summary

 aggregate(func) filter(func) Filter groups in the Column based on evaluating function func on each group sub-table.

Attributes Documentation

indices
keys

Methods Documentation

aggregate(func)[source]
filter(func)[source]

Filter groups in the Column based on evaluating function func on each group sub-table.

The function which is passed to this method must accept one argument:

It must then return either True or False. As an example, the following will select all column groups with only positive values:

def all_positive(column):
if np.any(column < 0):
return False
return True

Parameters
funcfunction

Filter function

Returns
outColumn

New column with the aggregated rows.