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def having(self, aggregations, test):
"""
Create a new :class:`.TableSet` with only those tables that pass a test.
This works by applying a sequence of :class:`Aggregation` instances to
each table. The resulting dictionary of properties is then passed to
the :code:`test` function.
This method does not modify the underlying tables in any way.
:param aggregations:
A list of tuples in the format :code:`(name, aggregation)`, where
each :code:`aggregation` is an instance of :class:`.Aggregation`.
:param test:
A function that takes a dictionary of aggregated properties and returns
:code:`True` if it should be included in the new :class:`.TableSet`.
:type test:
:class:`function`
:returns:
A new :class:`.TableSet`.
"""
new_tables = []
new_keys = []
for key, table in self.items():
props = table.aggregate(aggregations)
if test(props):
new_tables.append(table)
new_keys.append(key)
return self._fork(new_tables, new_keys)
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