[FIX] Table - copy attributes when creating table from table

Orange/data/table.py

@@ -1,3 +1,4 @@
+import copy
 import operator
 import os
 import sys
@@ -821,7 +822,7 @@ def from_table(cls, domain, source, row_indices=...):
                     self.ids = source.ids[row_indices]
                 else:
                     cls._init_ids(self)
-                self.attributes = getattr(source, 'attributes', {})
+                self.attributes = copy.deepcopy(getattr(source, 'attributes', {}))
                 _idcache_save(_thread_local.conversion_cache, (domain, source), self)
             return self
         finally:
@@ -879,7 +880,7 @@ def from_table_rows(cls, source, row_indices):
             self.W = source.W[row_indices]
             self.name = getattr(source, 'name', '')
             self.ids = np.array(source.ids[row_indices])
-            self.attributes = getattr(source, 'attributes', {})
+            self.attributes = copy.deepcopy(getattr(source, 'attributes', {}))
         return self
 
     @classmethod
@@ -2284,7 +2285,7 @@ def guessed_var(i, var_name):
             self.domain = Domain(attributes, class_vars, metas)
             progress_callback(0.9)
             cls._init_ids(self)
-            self.attributes = table.attributes.copy()
+            self.attributes = copy.deepcopy(table.attributes)
             self.attributes["old_domain"] = table.domain
             progress_callback(1)
             return self

Orange/tests/test_table.py

@@ -17,7 +17,7 @@
 import scipy.sparse as sp
 
 from Orange import data
-from Orange.data import (filter, Unknown, Variable, Table, DiscreteVariable,
+from Orange.data import (filter, Unknown, Table, DiscreteVariable,
                          ContinuousVariable, Domain, StringVariable)
 from Orange.data.util import SharedComputeValue
 from Orange.tests import test_dirname
@@ -1165,7 +1165,8 @@ def test_attributes(self):
         table2 = table[:4]
         self.assertEqual(table2.attributes[1], "test")
         table2.attributes[1] = "modified"
-        self.assertEqual(table.attributes[1], "modified")
+        self.assertEqual(table.attributes[1], "test")
+        self.assertEqual(table2.attributes[1], "modified")
 
     # TODO Test conjunctions and disjunctions of conditions
 
@@ -1893,6 +1894,28 @@ def assert_table_with_filter_matches(
         np.testing.assert_almost_equal(new_table.metas, magic[rows, mcols])
         np.testing.assert_almost_equal(new_table.W, old_table.W[rows])
 
+    def test_attributes_copied(self):
+        """Table created from table attributes dict copied"""
+        self.table.attributes = {"A": "Test", "B": []}
+
+        # from_table
+        new_table = self.table.from_table(self.table.domain, self.table)
+        self.assertDictEqual(new_table.attributes, {"A": "Test", "B": []})
+        new_table.attributes["A"] = "Changed"
+        new_table.attributes["B"].append(1)
+        self.assertDictEqual(new_table.attributes, {"A": "Changed", "B": [1]})
+        # attributes dict of old table not be changed since new dist is a copy
+        self.assertDictEqual(self.table.attributes, {"A": "Test", "B": []})
+
+        # from_table_rows
+        new_table = self.table.from_table_rows(self.table, [1, 2])
+        self.assertDictEqual(new_table.attributes, {"A": "Test", "B": []})
+        new_table.attributes["A"] = "Changed"
+        new_table.attributes["B"].append(1)
+        self.assertDictEqual(new_table.attributes, {"A": "Changed", "B": [1]})
+        # attributes dict of old table not be changed since new dist is a copy
+        self.assertDictEqual(self.table.attributes, {"A": "Test", "B": []})
+
 
 def isspecial(s):
     return isinstance(s, slice) or s is Ellipsis