vector2d examples updated after chapter 9 split

classes/vector2d_v0.py

@@ -4,22 +4,24 @@ A 2-dimensional vector class
 # BEGIN VECTOR2D_V0_DEMO
 
     >>> v1 = Vector2d(3, 4)
-    >>> x, y = v1  #<1>
+    >>> print(v1.x, v1.y)  # <1>
+    3.0 4.0
+    >>> x, y = v1  # <2>
     >>> x, y
     (3.0, 4.0)
-    >>> v1  #<2>
+    >>> v1  # <3>
     Vector2d(3.0, 4.0)
-    >>> v1_clone = eval(repr(v1))  #<3>
-    >>> v1 == v1_clone
+    >>> v1_clone = eval(repr(v1))  # <4>
+    >>> v1 == v1_clone  # <5>
     True
-    >>> print(v1)  #<4>
+    >>> print(v1)  # <6>
     (3.0, 4.0)
-    >>> octets = bytes(v1)  #<5>
+    >>> octets = bytes(v1)  # <7>
     >>> octets
-    b'\\x00\\x00\\x00\\x00\\x00\\x00\\x08@\\x00\\x00\\x00\\x00\\x00\\x00\\x10@'
-    >>> abs(v1)  #<6>
+    b'd\\x00\\x00\\x00\\x00\\x00\\x00\\x08@\\x00\\x00\\x00\\x00\\x00\\x00\\x10@'
+    >>> abs(v1)  # <8>
     5.0
-    >>> bool(v1), bool(Vector2d(0, 0))  #<7>
+    >>> bool(v1), bool(Vector2d(0, 0))  # <9>
     (True, False)
 
 # END VECTOR2D_V0_DEMO
@@ -41,20 +43,22 @@ class Vector2d:
         return (i for i in (self.x, self.y))  # <3>
 
     def __repr__(self):
-        return 'Vector2d({!r}, {!r})'.format(*self)  # <4>
+        class_name = type(self).__name__
+        return '{}({!r}, {!r})'.format(class_name, *self)  # <4>
 
     def __str__(self):
         return str(tuple(self))  # <5>
 
     def __bytes__(self):
-        return bytes(array(Vector2d.typecode, self))  # <6>
+        return (bytes([ord(self.typecode)]) +  # <6>
+                bytes(array(self.typecode, self)))  # <7>
 
     def __eq__(self, other):
-        return tuple(self) == tuple(other)  # <7>
+        return tuple(self) == tuple(other)  # <8>
 
     def __abs__(self):
-        return math.hypot(self.x, self.y)
+        return math.hypot(self.x, self.y)  # <9>
 
     def __bool__(self):
-        return bool(abs(self))  # <8>
+        return bool(abs(self))  # <10>
 # END VECTOR2D_V0