1

Author: vonzhou

01-data-model/frenchdeck.py

@@ -1,4 +1,5 @@
 import collections
+from random import choice
 
 Card = collections.namedtuple('Card', ['rank', 'suit'])
 
@@ -15,3 +16,13 @@ def __len__(self):
 
     def __getitem__(self, position):
         return self._cards[position]
+
+if __name__ == '__main__':
+    beer_card = Card('7', 'diamonds')
+    print(beer_card)
+
+
+    deck = FrenchDeck()
+    print(len(deck))
+    print(deck[0])
+    print(choice(deck))

01-data-model/vector2d.py

@@ -1,11 +1,13 @@
 from math import hypot
 
+
 class Vector:
 
     def __init__(self, x=0, y=0):
         self.x = x
         self.y = y
 
+    """类似 java 的 toString 方法"""
     def __repr__(self):
         return 'Vector(%r, %r)' % (self.x, self.y)
 
@@ -20,5 +22,13 @@ def __add__(self, other):
         y = self.y + other.y
         return Vector(x, y)
 
+
+    """标量乘法？"""
     def __mul__(self, scalar):
         return Vector(self.x * scalar, self.y * scalar)
+
+
+if __name__ == '__main__':
+    v1 = Vector(2, 4)
+    v2 = Vector(2, 1)
+    print(v1 + v2)