Basic implementation, can fill in some attributes on the character sheet.

tests/test_dice.py

@@ -0,0 +1,18 @@
+from unittest import TestCase
+
+from dungeonsheets.exceptions import DiceError
+from dungeonsheets import dice
+
+class TestDice(TestCase):
+
+    def test_read_dice_str(self):
+        out = dice.read_dice_str('1d6')
+        self.assertEqual(out.faces, 6)
+        self.assertEqual(out.num, 1)
+        # Multiple digits
+        out = dice.read_dice_str('15d10')
+        self.assertEqual(out.faces, 10)
+        self.assertEqual(out.num, 15)
+        # Check a bad value
+        with self.assertRaises(DiceError):
+            dice.read_dice_str('Ed15')