Data commit

Task/Polymorphism/Python/polymorphism-1.py

@@ -0,0 +1,14 @@
+class Point(object):
+    def __init__(self, x=0.0, y=0.0):
+        self.x = x
+        self.y = y
+    def __repr__(self):
+        return '<Point 0x%x x: %f y: %f>' % (id(self), self.x, self.y)
+
+class Circle(object):
+    def __init__(self, center=None, radius=1.0):
+        self.center = center or Point()
+        self.radius = radius
+    def __repr__(self):
+        return '<Circle 0x%x x: %f y: %f radius: %f>' % (
+            id(self), self.center.x, self.center.y, self.radius)

Task/Polymorphism/Python/polymorphism-2.py

@@ -0,0 +1,14 @@
+class Point(object):
+    def __init__(self, x=0.0, y=0.0):
+        self.x = x
+        self.y = y
+    def __repr__(self):
+        return '<Point 0x%x x: %f y: %f>' % (id(self), self.x, self.y)
+
+class Circle(Point):
+    def __init__(self, x=0.0, y=0.0, radius=1.0):
+        Point.__init__(self, x, y)
+        self.radius = radius
+    def __repr__(self):
+        return '<Circle 0x%x x: %f y: %f radius: %f>' % (
+            id(self), self.x, self.y, self.radius)

Task/Polymorphism/Python/polymorphism-3.py

@@ -0,0 +1,24 @@
+>>> from collections import namedtuple
+>>> class Point(namedtuple('Point', 'x y')):
+	def __new__( _cls, x=0, y=0 ):
+		return super().__new__(_cls, x, y)
+
+	
+>>> class Circle(namedtuple('Circle', 'x y r')):
+	def __new__( _cls, x=0, y=0, r=0 ):
+		return super().__new__(_cls, x, y, r)
+
+	
+>>> Point(), Point(x=1), Point(y=2), Point(3, 4)
+(Point(x=0, y=0), Point(x=1, y=0), Point(x=0, y=2), Point(x=3, y=4))
+>>> Circle(), Circle(r=2), Circle(1, 2, 3)
+(Circle(x=0, y=0, r=0), Circle(x=0, y=0, r=2), Circle(x=1, y=2, r=3))
+>>> p = Point(1.25, 3.87)
+>>> p
+Point(x=1.25, y=3.87)
+>>> p.x = 10.81
+Traceback (most recent call last):
+  File "<pyshell#27>", line 1, in <module>
+    p.x = 10.81
+AttributeError: can't set attribute
+>>>

Task/Polymorphism/Python/polymorphism-4.py

@@ -0,0 +1,7 @@
+>>> Point = namedtuple('Point', 'x y')
+>>> Circle = namedtuple('Circle', 'x y r')
+>>> Point(3, 4)
+Point(x=3, y=4)
+>>> Circle(x=1, y=2, r=3)
+Circle(x=1, y=2, r=3)
+>>>