add oop basic samples

michaelliao · michaelliao · commit 0ce9ce42b18b · 2015-04-01T13:33:06.000+08:00
diff --git a/py3/oop_basic/animals.py b/py3/oop_basic/animals.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+class Animal(object):
+    def run(self):
+        print('Animal is running...')
+
+class Dog(Animal):
+    def run(self):
+        print('Dog is running...')
+
+class Cat(Animal):
+    def run(self):
+        print('Cat is running...')
+
+def run_twice(animal):
+    animal.run()
+    animal.run()
+
+a = Animal()
+d = Dog()
+c = Cat()
+
+print('a is Animal?', isinstance(a, Animal))
+print('a is Dog?', isinstance(a, Dog))
+print('a is Cat?', isinstance(a, Cat))
+
+print('d is Animal?', isinstance(d, Animal))
+print('d is Dog?', isinstance(d, Dog))
+print('d is Cat?', isinstance(d, Cat))
+
+run_twice(c)
diff --git a/py3/oop_basic/attrs.py b/py3/oop_basic/attrs.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+class MyObject(object):
+
+    def __init__(self):
+        self.x = 9
+
+    def power(self):
+        return self.x * self.x
+
+obj = MyObject()
+
+print('hasattr(obj, \'x\') =', hasattr(obj, 'x')) # 有属性'x'吗？
+print('hasattr(obj, \'y\') =', hasattr(obj, 'y')) # 有属性'y'吗？
+setattr(obj, 'y', 19) # 设置一个属性'y'
+print('hasattr(obj, \'y\') =', hasattr(obj, 'y')) # 有属性'y'吗？
+print('getattr(obj, \'y\') =', getattr(obj, 'y')) # 获取属性'y'
+print('obj.y =', obj.y) # 获取属性'y'
+
+print('getattr(obj, \'z\') =',getattr(obj, 'z', 404)) # 获取属性'z'，如果不存在，返回默认值404
+
+f = getattr(obj, 'power') # 获取属性'power'
+print(f)
+print(f())
diff --git a/py3/oop_basic/get_instance.py b/py3/oop_basic/get_instance.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+class Animal(object):
+    pass
+
+class Dog(Animal):
+    pass
+
+class Husky(Dog):
+    pass
+
+a = Animal()
+d = Dog()
+h = Husky()
+
+print('check a = Animal()...')
+print('isinstance(a, Animal) =', isinstance(a, Animal))
+print('isinstance(a, Dog) =', isinstance(a, Dog))
+print('isinstance(a, Husky) =', isinstance(a, Husky))
+
+print('check d = Dog()...')
+print('isinstance(d, Animal) =', isinstance(d, Animal))
+print('isinstance(d, Dog) =', isinstance(d, Dog))
+print('isinstance(d, Husky) =', isinstance(d, Husky))
+
+print('check h = Husky()...')
+print('isinstance(h, Animal) =', isinstance(h, Animal))
+print('isinstance(h, Dog) =', isinstance(h, Dog))
+print('isinstance(h, Husky) =', isinstance(h, Husky))
diff --git a/py3/oop_basic/get_type.py b/py3/oop_basic/get_type.py
@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# type()
+
+print('type(123) =', type(123))
+print('type(\'123\') =', type('123'))
+print('type(None) =', type(None))
+print('type(abs) =', type(abs))
+
+import types
+
+print('type(\'abc\')==str?', type('abc')==str)
+
diff --git a/py3/oop_basic/protected_student.py b/py3/oop_basic/protected_student.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+class Student(object):
+
+    def __init__(self, name, score):
+        self.__name = name
+        self.__score = score
+
+    def get_name(self):
+        return self.__name
+
+    def get_score(self):
+        return self.__score
+
+    def set_score(self, score):
+        if 0 <= score <= 100:
+            self.__score = score
+        else:
+            raise ValueError('bad score')
+
+    def get_grade(self):
+        if self.__score >= 90:
+            return 'A'
+        elif self.__score >= 60:
+            return 'B'
+        else:
+            return 'C'
+
+bart = Student('Bart Simpson', 59)
+print('bart.get_name() =', bart.get_name())
+bart.set_score(60)
+print('bart.get_score() =', bart.get_score())
+
+print('DO NOT use bart._Student__name:', bart._Student__name)
