[ENH] Sort values naturally when reading files

Orange/data/io_base.py

@@ -22,6 +22,7 @@
     isnastr, guess_data_type, sanitize_variable
 from Orange.data.util import get_unique_names_duplicates
 from Orange.data.variable import VariableMeta
+from Orange.misc.collections import natural_sorted
 from Orange.util import Registry, flatten, namegen
 
 __all__ = ["FileFormatBase", "Flags", "DataTableMixin", "PICKLE_PROTOCOL"]
@@ -278,7 +279,7 @@ def _disc_column(data: np.ndarray, col: int) -> \
     def _disc_no_vals_column(data: np.ndarray, col: int, **_) -> \
             _ColumnProperties:
         vals, coltype = _TableBuilder._disc_column(data, col)
-        return _ColumnProperties(valuemap=sorted(set(vals) - {""}),
+        return _ColumnProperties(valuemap=natural_sorted(set(vals) - {""}),
                                  values=vals, coltype=coltype,
                                  orig_values=vals)
 

Orange/data/io_util.py

@@ -8,6 +8,7 @@
     is_discrete_values, MISSING_VALUES, Variable,
     DiscreteVariable, StringVariable, ContinuousVariable, TimeVariable,
 )
+from Orange.misc.collections import natural_sorted
 
 __all__ = ["Compression", "open_compressed", "detect_encoding", "isnastr",
            "guess_data_type", "sanitize_variable"]
@@ -121,7 +122,7 @@ def guess_data_type(orig_values, namask=None):
     if namask is None:
         namask = isnastr(orig_values)
     if is_discrete:
-        valuemap = sorted(is_discrete)
+        valuemap = natural_sorted(is_discrete)
         coltype = DiscreteVariable
     else:
         # try to parse as float

Orange/data/tests/test_io.py

@@ -4,10 +4,10 @@
 from Orange.data import ContinuousVariable, DiscreteVariable, StringVariable, \
     TimeVariable
 from Orange.data.io_util import guess_data_type
+from Orange.misc.collections import natural_sorted
 
 
 class TestTableFilters(unittest.TestCase):
-
     def test_guess_data_type_continuous(self):
         # should be ContinuousVariable
         valuemap, values, coltype = guess_data_type(list(range(1, 100)))
@@ -42,7 +42,7 @@ def test_guess_data_type_discrete(self):
         in_values = list(map(lambda x: str(x) + "a", range(24))) + ["a"] * 76
         valuemap, values, coltype = guess_data_type(in_values)
         self.assertEqual(DiscreteVariable, coltype)
-        self.assertEqual(sorted(set(in_values)), valuemap)
+        self.assertEqual(natural_sorted(set(in_values)), valuemap)
         np.testing.assert_array_equal(in_values, values)
 
     def test_guess_data_type_string(self):
@@ -93,3 +93,21 @@ def test_guess_data_type_time(self):
         valuemap, _, coltype = guess_data_type(in_values)
         self.assertEqual(TimeVariable, coltype)
         self.assertIsNone(valuemap)
+
+    def test_guess_data_type_values_order(self):
+        """
+        Test if values are ordered naturally
+        """
+        in_values = [
+            "something1", "something12", "something2", "something1",
+            "something20", "something1", "something2", "something12",
+            "something1", "something12"
+        ]
+        res = ["something1", "something2", "something12", "something20"]
+        valuemap, _, coltype = guess_data_type(in_values)
+        self.assertEqual(DiscreteVariable, coltype)
+        self.assertListEqual(res, valuemap)
+
+
+if __name__ == "__main__":
+    unittest.main()

Orange/misc/collections.py

@@ -1,3 +1,7 @@
+import re
+from typing import List
+
+
 class frozendict(dict):
     def clear(self):
         raise AttributeError("FrozenDict does not support method 'clear'")
@@ -20,3 +24,32 @@ def __setitem__(self, _key, _value):
     def __delitem__(self, _key):
         raise AttributeError("FrozenDict does not allow deleting elements")
 
+
+def natural_sorted(values: List) -> List:
+    """
+    Sort values with natural sort or human order - [sth1, sth2, sth10] or
+    [1, 2, 10]
+
+    Parameters
+    ----------
+    values
+        List with values to sort
+
+    Returns
+    -------
+    List with sorted values
+    """
+    def atoi(text):
+        return int(text) if text.isdigit() else text
+
+    def natural_keys(element):
+        """
+        alist.sort(key=natural_keys) or sorted(alist, key=natural_keys) sorts
+        in human order
+        """
+        if isinstance(element, (str, bytes)):
+            return [atoi(c) for c in re.split(r'(\d+)', element)]
+        else:
+            return element
+
+    return sorted(values, key=natural_keys)

Orange/misc/tests/test_collections.py

@@ -1,6 +1,6 @@
 import unittest
 
-from Orange.misc.collections import frozendict
+from Orange.misc.collections import frozendict, natural_sorted
 
 
 class TestFrozenDict(unittest.TestCase):
@@ -29,5 +29,37 @@ def test_functions_as_dict(self):
         self.assertEqual(set(d.items()), {("a", 12), ("b", 13)})
 
 
+class TestUtils(unittest.TestCase):
+    def test_natural_sorted(self):
+        data = [
+            "something1",
+            "something20",
+            "something2",
+            "something12"
+        ]
+        res = [
+            "something1",
+            "something2",
+            "something12",
+            "something20"
+        ]
+        self.assertListEqual(res, natural_sorted(data))
+
+    def test_natural_sorted_text(self):
+        data = ["b", "aa", "c", "dd"]
+        res = ["aa", "b", "c", "dd"]
+        self.assertListEqual(res, natural_sorted(data))
+
+    def test_natural_sorted_numbers_str(self):
+        data = ["1", "20", "2", "12"]
+        res = ["1", "2", "12", "20"]
+        self.assertListEqual(res, natural_sorted(data))
+
+    def test_natural_sorted_numbers(self):
+        data = [1, 20, 2, 12]
+        res = [1, 2, 12, 20]
+        self.assertListEqual(res, natural_sorted(data))
+
+
 if __name__ == "__main__":
     unittest.main()

Orange/widgets/utils/domaineditor.py

@@ -10,6 +10,7 @@
 
 from Orange.data import DiscreteVariable, ContinuousVariable, StringVariable, \
     TimeVariable, Domain
+from Orange.misc.collections import natural_sorted
 from Orange.data.util import get_unique_names_duplicates
 from Orange.statistics.util import unique
 from Orange.widgets import gui
@@ -326,7 +327,10 @@ def numbers_are_round(var, col_data):
             elif tpe == type(orig_var):
                 var = orig_var.copy(name=new_name)
             elif tpe == DiscreteVariable:
-                values = list(str(i) for i in unique(col_data) if not self._is_missing(i))
+                values = natural_sorted(
+                    list(str(i) for i in unique(col_data)
+                         if not self._is_missing(i))
+                )
                 round_numbers = numbers_are_round(orig_var, col_data)
                 col_data = [np.nan if self._is_missing(x) else values.index(str(x))
                             for x in self._iter_vals(col_data)]