tracks/python/exercises/scale-generator/example.py in trackler-2.2.1.74 vs tracks/python/exercises/scale-generator/example.py in trackler-2.2.1.75

@@ -11,12 +11,12 @@
     def __init__(self, tonic, scale_name, pattern=None):
         self.tonic = tonic.capitalize()
         self.name = self.tonic + ' ' + scale_name
         self.pattern = pattern
         self.chromatic_scale = (self.FLAT_CHROMATIC_SCALE
-                                if tonic in self.FLAT_KEYS else
-                                self.CHROMATIC_SCALE)
+                                if tonic in self.FLAT_KEYS
+                                else self.CHROMATIC_SCALE)
         self.pitches = self._assign_pitches()
 
     def _assign_pitches(self):
         if self.pattern is None:
             return self._reorder_chromatic_scale()
@@ -25,10 +25,10 @@
         scale = self._reorder_chromatic_scale()
         for i, interval in enumerate(self.pattern):
             pitches.append(scale[last_index])
             last_index += self.ASCENDING_INTERVALS.index(interval) + 1
         if pitches[0] != scale[last_index % len(scale)]:
-            raise ValueError()
+            raise ValueError("Interval is broken")
         return pitches
 
     def _reorder_chromatic_scale(self):
         index = self.chromatic_scale.index(self.tonic)
         return self.chromatic_scale[index:] + self.chromatic_scale[:index]