parse_ranges: Added support of Bonus3.

parse_ranges/parse_ranges.py

@@ -28,4 +28,30 @@ def parse_ranges_v3(range_string):
                 yield number
 
 
-parse_ranges = parse_ranges_v3
+def parse_ranges_v4(range_string):
+    """My take at Bonus3."""
+    # We prepare the data
+    range_string = range_string.replace("->", "-")
+
+    # We extract integer tuples from the data
+    ranges = []
+    for subrange in range_string.split(","):
+        splited = subrange.split("-")
+        try:
+            item = tuple(map(int, splited))
+        except ValueError:
+            # This item shall then contains text in the 2nd part
+            item = (int(splited[0]),)
+        ranges.append(item)
+
+    # We procede as before
+    for limits in ranges:
+        if len(limits) == 1:
+            yield limits[0]
+        else:
+            start, stop = limits
+            for number in range(start, stop + 1):
+                yield number
+
+
+parse_ranges = parse_ranges_v4

parse_ranges/test_parse_ranges.py

@@ -29,7 +29,6 @@ class ParseRangesTests(unittest.TestCase):
             list(parse_ranges("0,4-8,20,43-45")), [0, 4, 5, 6, 7, 8, 20, 43, 44, 45]
         )
 
-    @unittest.expectedFailure
     def test_ignore_arrows(self):
         self.assertEqual(
             list(parse_ranges("0, 4-8, 20->exit, 43-45")),