Adding __eq__ to Card

AllenDowney · AllenDowney · commit 9ea23ce86da6 · 2016-03-04T14:42:55.000-05:00
diff --git a/book/book.tex b/book/book.tex
@@ -33,7 +33,7 @@
 \title{Think Python}
 \author{Allen B. Downey}
 \newcommand{\thetitle}{Think Python: How to Think Like a Computer Scientist}
-\newcommand{\theversion}{2nd Edition, Version 2.2.14}
+\newcommand{\theversion}{2nd Edition, Version 2.2.15}
 \newcommand{\thedate}{}
 
 % these styles get translated in CSS for the HTML version
@@ -8291,6 +8291,8 @@ \section{Debugging}
 
 In this example you could also use the built-in function {\tt sorted},
 which returns a new, sorted list and leaves the original alone.
+\index{sorted!function}
+\index{function!sorted}
 
 \begin{verbatim}
 >>> t2 = sorted(t)
@@ -8857,8 +8859,8 @@ \section{Looping and dictionaries}
 %
 Again, the keys are in no particular order.  To traverse the keys
 in sorted order, you can use the built-in function {\tt sorted}:
-\index{keys method}
-\index{method!keys}
+\index{sorted!function}
+\index{function!sorted}
 
 \begin{verbatim}
 >>> for key in sorted(h):
@@ -10791,7 +10793,7 @@ \section{Dictionary subtraction}
 diff = subtract(hist, words)
 
 print("Words in the book that aren't in the word list:")
-for word in diff.keys():
+for word in diff:
     print(word, end=' ')
 \end{verbatim}
 %
diff --git a/code/Card.py b/code/Card.py
@@ -35,6 +35,13 @@ def __str__(self):
         return '%s of %s' % (Card.rank_names[self.rank],
                              Card.suit_names[self.suit])
 
+    def __eq__(self, other):
+        """Checks whether self and other have the same rank and suit.
+
+        returns: boolean
+        """
+        return self.suit == other.suit and self.rank == other.rank
+
     def __lt__(self, other):
         """Compares this card to other, first by suit, then rank.
 
diff --git a/code/Card_test.py b/code/Card_test.py
@@ -0,0 +1,23 @@
+"""This file contains code for use with "Think Stats",
+by Allen B. Downey, available from greenteapress.com
+
+Copyright 2014 Allen B. Downey
+License: GNU GPLv3 http://www.gnu.org/licenses/gpl.html
+"""
+
+from __future__ import print_function, division
+
+import unittest
+from Card import Card, Deck
+
+
+class Test(unittest.TestCase):
+
+    def testDeckRemove(self):
+        deck = Deck()
+        card23 = Card(2, 3)
+        deck.remove_card(card23)
+
+
+if __name__ == "__main__":
+    unittest.main()
