#coding:utf-8
class Student(object):
  name = 'I am a class variable' #類變量
>>> s = Student() # 創(chuàng)建實例s
>>> print(s.name) # 打印name屬性，因為實例并沒有name屬性，所以會繼續(xù)查找class的name屬性
Student
>>> print(Student.name) # 打印類的name屬性
Student
>>> s.name = 'Michael' # 給實例綁定name屬性
>>> print(s.name) # 由于實例屬性優(yōu)先級比類屬性高，因此，它會屏蔽掉類的name屬性
Michael
>>> print(Student.name) # 但是類屬性并未消失，用Student.name仍然可以訪問
Student
>>> del s.name # 如果刪除實例的name屬性
>>> print(s.name) # 再次調(diào)用s.name，由于實例的name屬性沒有找到，類的name屬性就顯示出來了
Student

# coding:utf-8
class Foo(object):
  """類三種方法語法形式"""
 
  def instance_method(self):
    print("是類{}的實例方法，只能被實例對象調(diào)用".format(Foo))
 
  @staticmethod
  def static_method():
    print("是靜態(tài)方法")
 
  @classmethod
  def class_method(cls):
    print("是類方法")
 
foo = Foo()
foo.instance_method()
foo.static_method()
foo.class_method()
print('----------------')
Foo.static_method()
Foo.class_method()

是類<class '__main__.Foo'>的實例方法，只能被實例對象調(diào)用
是靜態(tài)方法
是類方法
----------------
是靜態(tài)方法
是類方法

# coding:utf-8
class 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)