updated syllabus

Author: PythonCHB

Examples/week-06-OO/even_int.py

@@ -9,9 +9,13 @@
 
 """
 
-class EvenInt():
+
+class EvenInt(int):
     """
     An integer that is always even
     """
-    pass
 
+    def __new__(cls, input):
+        input = float(input)
+        i = int(round(input / 2) * 2)
+        return int.__new__(cls, i)

Examples/week-06-OO/mixins.py

@@ -1,15 +1,22 @@
 import time
 
 
-class LoggingMixin(object):
+class Base(object):
     def log(self):
-        print "%s: %s" % (time.time(), repr(self))
+        pass
 
 
-class Vehicle(object):
+class LoggingMixin(Base):
     def log(self):
-        print self.__repr__()
+        print "%s" % time.time(),
+        print "self is:", self
+        super(LoggingMixin, self).log()
+
 
+class Vehicle(Base):
+    def log(self):
+        print self.__repr__()
+        super(Vehicle, self).log()
 
 class TwoWheeledVehicle(Vehicle):
     pass
@@ -23,7 +30,7 @@ class HeavyVehicle(Vehicle):
     pass
 
 
-class Bike(TwoWheeledVehicle, LightVehicle):
+class Bike(LoggingMixin, TwoWheeledVehicle, LightVehicle):
     pass
 
 

Examples/week-06-OO/new_example.py

@@ -9,31 +9,36 @@
 ## the general case:
 class Test(object):
     def __new__(cls, arg):
-        print "in __new__", 
+        print "in __new__",
         print arg
         obj =  object.__new__(cls, arg)
         obj.this = arg # but you probably don't want to do this!
         return obj
 
     def __init__(self, arg):
-        print "in __init__", 
+        print "in __init__",
         print arg
         self.that = arg
 
 
 ##subclassing a string
 
+class Test(object):
+    def __init__(self):
+        print "in Test.__init__"
+
 class CapitalString(str):
     """
     A string class that is always capitalized...
     """
     def __new__(cls, in_string):
         print "in CapitalString.__new__"
-        return str.__new__(cls, in_string.title() )
+        return Test.__new__(cls, in_string)
+        #return str.__new__(cls, in_string.title() )
 
 # try it:
-if __name__ == "__main__":
-    print CapitalString("this is a string")
+#if __name__ == "__main__":
+#    print CapitalString("this is a string")