52 lines
1.8 KiB
Python
52 lines
1.8 KiB
Python
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#!/usr/bin/env python
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# pylint: disable=W0212
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from agate.rows import Row
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from agate.tableset import Table
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def merge(self, groups=None, group_name=None, group_type=None):
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"""
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Convert this TableSet into a single table. This is the inverse of
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:meth:`.Table.group_by`.
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Any `row_names` set on the merged tables will be lost in this
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process.
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:param groups:
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A list of grouping factors to add to merged rows in a new column.
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If specified, it should have exactly one element per :class:`Table`
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in the :class:`TableSet`. If not specified or None, the grouping
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factor will be the name of the :class:`Row`'s original Table.
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:param group_name:
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This will be the column name of the grouping factors. If None,
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defaults to the :attr:`TableSet.key_name`.
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:param group_type:
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This will be the column type of the grouping factors. If None,
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defaults to the :attr:`TableSet.key_type`.
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:returns:
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A new :class:`Table`.
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"""
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if type(groups) is not list and groups is not None:
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raise ValueError('Groups must be None or a list.')
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if type(groups) is list and len(groups) != len(self):
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raise ValueError('Groups length must be equal to TableSet length.')
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column_names = list(self._column_names)
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column_types = list(self._column_types)
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column_names.insert(0, group_name if group_name else self._key_name)
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column_types.insert(0, group_type if group_type else self._key_type)
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rows = []
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for index, (key, table) in enumerate(self.items()):
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for row in table._rows:
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if groups is None:
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rows.append(Row((key,) + tuple(row), column_names))
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else:
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rows.append(Row((groups[index],) + tuple(row), column_names))
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return Table(rows, column_names, column_types)
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