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gotypes.py

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+# tag::enumimport[]
+import enum
+# end::enumimport[]
+# tag::namedtuple[]
+from collections import namedtuple
+# end::namedtuple[]
+__all__ = [
+    'Player',
+    'Point',
+]
+
+
+# tag::color[]
+class Player(enum.Enum):
+    black = 1
+    white = 2
+
+    @property
+    def other(self):
+        return Player.black if self == Player.white else Player.white
+# end::color[]
+
+
+# tag::points[]
+class Point(namedtuple('Point', 'row col')):
+    def neighbors(self):
+        return [
+            Point(self.row - 1, self.col),
+            Point(self.row + 1, self.col),
+            Point(self.row, self.col - 1),
+            Point(self.row, self.col + 1),
+        ]
+# end::points[]
+
+    def __deepcopy__(self, memodict={}):
+        # These are very immutable.
+        return self