Add coercions

diff --git a/Demo/classes/Rat.py b/Demo/classes/Rat.py
index 0b2519d5c285635f4cedd1c998ae4cad3b6bec98..0d3e5156133c72806daf28d4045f41e2761069b5 100755 (executable)
--- a/Demo/classes/Rat.py
+++ b/Demo/classes/Rat.py
@@ -52,12 +52,18 @@ class Rat:
                raise TypeError, 'Rat.__coerce__: bad other arg'
                        
        def __add__(a, b):
+               if type(b) <> type(a):
+                       a, b = a.__coerce__(b)
+                       return a + b
                return rat(a.num*b.den + b.num*a.den, a.den*b.den)
 
        def __sub__(a, b):
                return rat(a.num*b.den - b.num*a.den, a.den*b.den)
 
        def __mul__(a, b):
+               if type(b) <> type(a):
+                       a, b = a.__coerce__(b)
+                       return a * b
                return rat(a.num*b.num, a.den*b.den)
 
        def __div__(a, b):
@@ -78,9 +84,13 @@ def test():
        l.sort()
        print l
        print rat(0, 1)
-       print rat(1, 0)
        print a+1
        print a+1L
        print a+1.0
+       try:
+               print rat(1, 0)
+               raise SystemError, 'should have been ZeroDivisionError'
+       except ZeroDivisionError:
+               print 'OK'
 
-test()
+#test()