关于oop:python中的保护方法

Protected method in python

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Possible Duplicate:
Making a method private in a python subclass
Private Variables and Methods in Python

如何在受保护的Python类中定义一个方法，并且只有子类才能看到它？

这是我的代码：

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class BaseType(Model):
def __init__(self):
Model.__init__(self, self.__defaults())

def __defaults(self):
return {'name': {},
'readonly': {},
'constraints': {'value': UniqueMap()},
'cType': {}
}

cType = property(lambda self: self.getAttribute("cType"), lambda self, data: self.setAttribute('cType', data))
name = property(lambda self: self.getAttribute("name"), lambda self, data: self.setAttribute('name', data))
readonly = property(lambda self: self.getAttribute("readonly"),
lambda self, data: self.setAttribute('readonly', data))

constraints = property(lambda self: self.getAttribute("constraints"))

def getJsCode(self):
pass

def getCsCode(self):
pass

def generateCsCode(self, template=None, constraintMap=None, **kwargs):
if not template:
template = self.csTemplate

if not constraintMap: constraintMap = {}
atts =""

constraintMap.update(constraintMap)

for element in self.getNoneEmptyAttributes():
if not AbstractType.constraintMap.has_key(element[0].lower()):
continue
attTemplate = Template(AbstractType.constraintMap[element[0].lower()]['cs'])
attValue = str(element[1]['value'])
atts +="%s " % attTemplate.substitute({'value': attValue})

kwargs.update(dict(attributes=atts))

return template.substitute(kwargs)

class MainClass(BaseType, Model):
def __init__(self):
#Only Model will initialize
Model.__init__(self, self.__defaults())
BaseType.__init__(self)

def __defaults(self):
return {'name': {},
'fields': {'value': UniqueMap()},
'innerClass': {'value': UniqueMap()},
'types': {}
}

fields = property(lambda self: self.getAttribute("fields"))
innerClass = property(lambda self: self.getAttribute("innerClass"))
types = property(lambda self: self.getAttribute("types"))

@staticmethod
def isType(iType):
# return type(widget) in WidgetSelector.widgets.itervalues()
return isinstance(iType, AbstractType)

def addType(self, type):
if not MainClass.isType(type):
raise Exception,"Unknown widget type %s" % type
self.types[type.name] = type

我只想知道BaseType的子类见BaseType的generateCsCode方法。