我在努力做一门博格式的课。我希望一个特定的属性被所有实例共享,但其他属性我希望是唯一的实例。到目前为止,我掌握的情况如下:
class SharedFacility:
_facility = None
def __init__(self):
entries = {'facility': self._facility}
self.__dict__.update(entries)
def _getfacility(self):
return self._facility
def _setfacility(self, value):
self._facility = value
facility = property(_getfacility, _setfacility)
class Warning(SharedFacility):
def __init__(self, warnlevel, warntext):
SharedFacility.__init__(self)
print "Warning.__init__()"
self.warntext = warntext
self.warnlevel = warnlevel
def __call__(self):
self.facility(self.warnlevel, self.warntext)
def functionOne(a,b):
print 'functionOne: a=%s, b=%s' % (a,b)
def functionTwo(a,b):
print 'functionTwo: a=%s, b=%s' % (a,b)
####################################################
w1 = Warning(1, 'something bad happened')
w1.facility = functionOne
w2 = Warning(5, 'something else bad happened')
import pdb; pdb.set_trace()
if w1.facility is w2.facility:
print "They match!"
w1() # functionOne: a=1, b='something bad happened'
w2() # functionOne: a=5, b='something else bad happened'
w2.facility = functionTwo
if w1.facility is w2.facility:
print "They match!"
w1() # functionTwo: a=1, b='something bad happened'
w2() # functionTwo: a=5, b='something else bad happened'
上面的代码不起作用。我希望w1.facility和w2.facility是对同一对象的引用,但是w1.warntext和w2.warntext是两个不同的值。我正在使用python2.4.3(没有必要提到我升级了,因为我不能升级)。你知道吗
解决方案:
class Warning(object):
_facility = None
def __init__(self, warnlevel, warntext):
print "Warning.__init__()"
self._warntext = warntext
self._warnlevel = warnlevel
def __call__(self):
Warning._facility(self._warnlevel, self._warntext)
def _getfacility(self):
return Warning._facility
def _setfacility(self, value):
Warning._facility = value
facility = property(_getfacility, _setfacility)
@staticmethod
def functionOne(a,b):
print 'functionOne: a=%s, b=%s' % (a,b)
@staticmethod
def functionTwo(a,b):
print 'functionTwo: a=%s, b=%s' % (a,b)
我会这么做:
我希望你知道如何使用这个例子为自己的目的。我不太确定你的代码想要什么,所以我避免猜测,只写了一个简单的例子。你知道吗
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