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Add row slicing #110

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Add row slicing #110

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6 changes: 5 additions & 1 deletion datascience/tables.py
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Original file line number Diff line number Diff line change
Expand Up @@ -148,7 +148,11 @@ def _add_column_and_format(self, table, label, column):
#################

def __getitem__(self, label):
return self.values(label)
if isinstance(label, slice) or hasattr(label, '__index__'):
return self._with_columns(column[label]
for column in self._columns.values())
else:
return self.values(label)

def __setitem__(self, label, values):
self.append_column(label, values)
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10 changes: 10 additions & 0 deletions tests/test_tables.py
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Expand Up @@ -749,3 +749,13 @@ def test_q_chaining(table):
letter | count | points
a | 9 | 1
""")

def test_row_slicing(table):
t = table[:2]
assert_equal(t.column_labels, ('letter', 'count', 'points'))
assert_array_equal(t.columns[0], ['a', 'b'])
assert_array_equal(t.columns[1], [9, 3])
assert_array_equal(t.columns[2], [1, 2])

t_row = table[-1]
assert_equal(len(t_row.rows), 1)