python中类的属性和方法介绍

#coding:utf-8class Student(object):  name = 'I am a class variable' #类变量>>> s = Student() # 创建实例s>>> print(s.name) # 打印name属性，因为实例并没有name属性，所以会继续查找class的name属性Student>>> print(Student.name) # 打印类的name属性Student>>> s.name = 'Michael' # 给实例绑定name属性>>> print(s.name) # 由于实例属性优先级比类属性高，因此，它会屏蔽掉类的name属性Michael>>> print(Student.name) # 但是类属性并未消失，用Student.name仍然可以访问Student>>> del s.name # 如果删除实例的name属性>>> print(s.name) # 再次调用s.name，由于实例的name属性没有找到，类的name属性就显示出来了Student

# coding:utf-8class Foo(object):  """类三种方法语法形式"""   def instance_method(self):    print("是类{}的实例方法，只能被实例对象调用".format(Foo))   @staticmethod  def static_method():    print("是静态方法")   @classmethod  def class_method(cls):    print("是类方法") foo = Foo()foo.instance_method()foo.static_method()foo.class_method()print('----------------')Foo.static_method()Foo.class_method()

是类<class '__main__.Foo'>的实例方法，只能被实例对象调用是静态方法是类方法----------------是静态方法是类方法

# coding:utf-8class Book(object):   def __init__(self, title):    self.title = title   @classmethod  def class_method_create(cls, title):    book = cls(title=title)    return book   @staticmethod  def static_method_create(title):    book= Book(title)    return book book1 = Book("use instance_method_create book instance")book2 = Book.class_method_create("use class_method_create book instance")book3 = Book.static_method_create("use static_method_create book instance")print(book1.title)print(book2.title)print(book3.title)