MetaClass

type

class Hello(object) <==> type('Hello', (object, ), dict())

• class

  class Hello(object):
      def __init__(self):
          self.meta = 110
          print self.foo
          print self.bar()
  
      @property
      def foo(self):
          return self.meta
  
      def bar(self, plus=1):
          return self.meta + 1
  
  hello = Hello()
  # 110
  # 111
  

• type

  def __init__(self):
      self.meta = 110
      print self.foo
      print self.bar()
  
  @property
  def foo(self):
      return self.meta
  
  def bar(self, plus=1):
      return self.meta + 1
  
  Hello = type('Hello', (object, ), dict(__init__=__init__, foo=foo, bar=bar))
  
  hello = Hello()
  # 110
  # 111
  

• See django-excel-response2/blob/master/excel_response2.py

metaclass

• See Simple ORM using metaclass

References

[1] Ivan Smirnov's Blog, Python metaclasses