Data commit

Task/Polymorphic-copy/Python/polymorphic-copy-1.py

@@ -0,0 +1,54 @@
+import copy
+
+class T:
+   def classname(self):
+      return self.__class__.__name__
+
+   def __init__(self):
+      self.myValue = "I'm a T."
+
+   def speak(self):
+      print self.classname(), 'Hello', self.myValue
+
+   def clone(self):
+      return copy.copy(self)
+
+class S1(T):
+   def speak(self):
+      print self.classname(),"Meow", self.myValue
+
+class S2(T):
+   def speak(self):
+      print self.classname(),"Woof", self.myValue
+
+
+print "creating initial objects of types S1, S2, and T"
+a = S1()
+a.myValue = 'Green'
+a.speak()
+
+b = S2()
+b.myValue = 'Blue'
+b.speak()
+
+u = T()
+u.myValue = 'Purple'
+u.speak()
+
+print "Making copy of a as u, colors and types should match"
+u = a.clone()
+u.speak()
+a.speak()
+print "Assigning new color to u, A's color should be unchanged."
+u.myValue = "Orange"
+u.speak()
+a.speak()
+
+print "Assigning u to reference same object as b, colors and types should match"
+u = b
+u.speak()
+b.speak()
+print "Assigning new color to u. Since u,b references same object b's color changes as well"
+u.myValue = "Yellow"
+u.speak()
+b.speak()

Task/Polymorphic-copy/Python/polymorphic-copy-2.py

@@ -0,0 +1,7 @@
+import cPickle as pickle
+
+source = {'a': [1, 2.0, 3, 4+6j],
+         'b': ('string', u'Unicode string'),
+         'c': None}
+
+target = pickle.loads(pickle.dumps(source))

Task/Polymorphic-copy/Python/polymorphic-copy-3.py

@@ -0,0 +1,8 @@
+target = source.__class__()  # Create an object of the same type
+if hasattr(source, 'items') and callable(source.items):
+    for key,value in source.items:
+        target[key] = value
+elif hasattr(source, '__len__'):
+    target = source[:]
+else:  # Following is not recommended. (see below).
+    target = source