python中类的一些方法分析

class Super: 
  def delegate(self): 
    self.action() 
     
class Provider(Super): 
  def action(self): 
    print 'in Provider.action' 
     
x = Provider() 
x.delegate() 

class Super: 
  def delegate(self): 
    self.action() 
  def method(self): 
    print 'super method' 
   
class Inherit(Super): 
  pass 
 
class Replace(Super): 
  def method(self): 
    print "replace method" 
     
class Extended(Super): 
  def method(self): 
    print 'in extended class' 
    Super.method(self) 
    print 'out extended class' 
   
class Provider(Super): 
  def action(self): 
    print 'in Provider.action' 
     
x = Inherit() 
x.method() 
print '*'*50 
 
y = Replace() 
y.method() 
print '*'*50 
 
z = Extended() 
z.method() 
print '*'*50 
 
x = Provider() 
x.delegate() 

super method 
************************************************** 
replace method 
************************************************** 
in extended class 
super method 
out extended class 
************************************************** 
in Provider.action