向python对象动态添加方法

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def barFighters( self ):
    print "barFighters"
a.barFighters = barFighters
a.barFighters()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: barFighters() takes exactly 1 argument (0 given)
import types
a.barFighters = types.MethodType( barFighters, a )
a.barFighters()
barFighters

>

引用：
http://stackoverflow.com/questions/972/adding-a-method-to-an-existing-object-instance