personal edit on 01-data-model

Author: lijun.S

01-data-model/frenchdeck.py

@@ -2,13 +2,15 @@
 
 Card = collections.namedtuple('Card', ['rank', 'suit'])
 
+
 class FrenchDeck:
     ranks = [str(n) for n in range(2, 11)] + list('JQKA')
     suits = 'spades diamonds clubs hearts'.split()
 
     def __init__(self):
-        self._cards = [Card(rank, suit) for suit in self.suits
-                                        for rank in self.ranks]
+        self._cards = [
+            Card(rank, suit) for suit in self.suits for rank in self.ranks
+        ]
 
     def __len__(self):
         return len(self._cards)

01-data-model/frenchdeck_run.py

@@ -0,0 +1,44 @@
+from random import choice
+from frenchdeck import FrenchDeck, Card
+
+beer_card = Card('7', 'diamonds')
+beer_card
+
+deck = FrenchDeck()
+len(deck)
+
+deck[:3]
+
+deck[1::2]
+
+Card('Q', 'hearts') in deck
+
+Card('Z', 'clubs') in deck
+
+for card in deck:
+    print(card)
+
+for card in reversed(deck):
+    print(card)
+
+for n, card in enumerate(deck, 1):
+    print(n, card)
+
+
+choice(deck)
+
+
+suit_values = dict(spades=3, hearts=2, diamonds=1, clubs=0)
+
+
+def spades_high(card):
+    rank_value = FrenchDeck.ranks.index(card.rank)
+    return rank_value * len(suit_values) + suit_values[card.suit]
+
+
+spades_high(Card('2', 'clubs'))
+spades_high(Card('A', 'spades'))
+
+
+for card in sorted(deck, key=spades_high):
+    print(card)

01-data-model/vector2d.py

@@ -1,17 +1,23 @@
 from math import hypot
 
-class Vector:
 
+class Vector:
     def __init__(self, x=0, y=0):
         self.x = x
         self.y = y
 
     def __repr__(self):
         return 'Vector(%r, %r)' % (self.x, self.y)
 
+    def __neg__(self):
+        return Vector(-self.x, -self.y)
+
     def __abs__(self):
         return hypot(self.x, self.y)
 
+    def __lt__(self, other):
+        return (self.x > other.x) and (self.y > other.y)
+
     def __bool__(self):
         return bool(abs(self))
 

01-data-model/vector2d_run.py

@@ -0,0 +1,16 @@
+from vector2d import Vector
+
+v1 = Vector(2, 4)
+v2 = Vector(1, 2)
+print(v1 + v2)
+
+v = Vector(3, 4)
+print(abs(v))
+
+print(v * 2)
+
+print(v is True)
+
+print(-v)
+
+print(v1 < v2)