add day-13

dreamapplehappy · dreamapplehappy · commit 0ee16ab0ee08 · 2017-10-29T21:54:30.000+08:00
diff --git a/day-13/access_restriction.py b/day-13/access_restriction.py
@@ -0,0 +1,25 @@
+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_name(self, name):
+        self.__name = name
+
+    def set_score(self, score):
+        self.__score = score
+
+    def show_info(self):
+        print('this student\'s name is %s and his(her) score is %d.' % (self.__name, self.__score))
+
+s1 = Student('dream', 99)
+s1.show_info()
+print(s1.get_name())
+s1.set_name('dreamapple')
+print(s1.get_name())
diff --git a/day-13/class_and_instance.py b/day-13/class_and_instance.py
@@ -0,0 +1,22 @@
+class Student(object):
+    # 初始化类的实例
+    def __init__(self, name, score):
+        self.name = name
+        self.score = score
+
+    # 获取分数等级
+    def get_grade(self):
+        if self.score >= 90:
+            return 'A'
+        elif self.score >= 80:
+            return 'B'
+        else:
+            return 'C'
+
+
+dreamapple = Student('dreamapple', 90)
+print(dreamapple)
+print(dreamapple.get_grade())
+
+dreamapple.age = 24
+print(dreamapple.age)
diff --git a/day-13/class_and_instance_attr.py b/day-13/class_and_instance_attr.py
@@ -0,0 +1,18 @@
+class Animal(object):
+
+    is_alive = True
+
+    def __init__(self, name, age):
+        self.__name = name
+        self.age = age
+
+
+animal1 = Animal('Duo', 10)
+
+print(animal1.is_alive)  # True
+print(Animal.is_alive)  # True
+
+Animal.is_alive = False
+print(Animal.is_alive)  # False
+
+print(animal1.age)  # 10
diff --git a/day-13/get_object_info.py b/day-13/get_object_info.py
@@ -0,0 +1,54 @@
+import types
+
+
+# 使用type进行类别的判断
+print(type(1))  # <class 'int'>
+print(type('str'))  # <class 'str'>
+print(type(True))   # <class 'bool'>
+print(type(lambda x: x))  # <class 'function'>
+print(type(None))  # <class 'NoneType'>
+print(type(abs))  # <class 'builtin_function_or_method'>
+
+
+class Animal(object):
+    def __init__(self, name):
+        self.__name = name
+
+    def __len__(self):
+        return 1
+
+
+animal1 = Animal('DuoDuo')
+
+
+def func():
+    pass
+
+
+print(type(animal1))  # <class '__main__.Animal'>
+print(type(func))  # <class 'function'>
+
+print(type(func) == types.FunctionType)  # True
+print(type(abs) == types.BuiltinFunctionType)  # True
+print(type(lambda x: x) == types.LambdaType)  # True
+print(type(x for x in range(10)) ==  types.GeneratorType)  # True
+
+# 使用isinstance判断一个对象是否是一个类的实例
+print(isinstance(animal1, object))  # True
+print(isinstance(animal1, Animal))  # True
+
+# 还可以判断一个变量是否是某些类型中的一种
+print(isinstance([1, 2, 3], (list, tuple)))  # True
+
+
+# 使用dir获取一个对象的所有属性和方法
+print(dir(animal1))  # 太多了，暂时不列举出来
+print(len([]))  # 0
+print(len(animal1))  # 1，这个方法需要我们在对象的内部进行实现
+
+# 使用getattr， setattr， hasattr方法
+print(getattr(animal1, 'name', 404))  # 404
+print(setattr(animal1, 'age', 10))  # None
+print(hasattr(animal1, 'age'))  # True
+
+
diff --git a/day-13/inheritance_and_polymorphism.py b/day-13/inheritance_and_polymorphism.py
@@ -0,0 +1,42 @@
+class Animal(object):
+
+    def __init__(self):
+        pass
+
+    def run(self):
+        print('this animal is running!')
+
+
+class Dog(Animal):
+
+    def run(self):
+        print('this dog is running')
+
+
+class Cat(Animal):
+
+    def run(self):
+        print('this cat is running')
+
+
+
+animal1 = Animal()
+dog1 = Dog()
+cat1 = Cat()
+
+animal1.run()
+dog1.run()
+cat1.run()
+
+# 多态的好处
+def run(animal):
+    animal.run()
+
+run(animal1)
+run(dog1)
+run(cat1)
+
+# 使用方法isinstance判断一个对象是不是一个类的实例
+print(isinstance(animal1, Animal))
+print(isinstance(dog1, Dog))
+print(isinstance(cat1, Cat))
