《python 从入门到精通》 §9 特殊方法、属性、迭代器
参考地址：http://www.verydemo.com/demo_c122_i18580.html<!--><xml><w:WordDocument><w:View>Normal</w:View><w:Zoom>0</w:Zoom><w:PunctuationKerning/><w:DrawingGridVerticalSpacing>7.8 磅</w:DrawingGridVerticalSpacing><w:DisplayHorizontalDrawingGridEvery>0</w:DisplayHorizontalDrawingGridEvery><w:DisplayVerticalDrawingGridEvery>2</w:DisplayVerticalDrawingGridEvery><w:ValidateAgainstSchemas/><w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid><w:IgnoreMixedContent>false</w:IgnoreMixedContent><w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText><w:Compatibility><w:SpaceForUL/><w:BalanceSingleByteDoubleByteWidth/><w:DoNotLeaveBackslashAlone/><w:ULTrailSpace/><w:DoNotExpandShiftReturn/><w:AdjustLineHeightInTable/><w:BreakWrappedTables/><w:SnapToGridInCell/><w:WrapTextWithPunct/><w:UseAsianBreakRules/><w:DontGrowAutofit/><w:UseFELayout/></w:Compatibility><w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel></w:WordDocument></xml><!--><!--><xml><w:LatentStyles DefLockedState="false" LatentStyleCount="156"></w:LatentStyles></xml><!--><!--><style>/* Style Definitions */table.MsoNormalTable{mso-style-name:普通表格;mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-parent:"";mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-para-margin:0cm;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-size:10.0pt;font-family:"Times New Roman";mso-ansi-language:#0400;mso-fareast-language:#0400;mso-bidi-language:#0400;}</style><!--><!----><!---->
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Bird.__init__(self)
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def sing(self):
print self.sound
self.hungry = True
def eat(self):
if self.hungry:
self.hungry = False
else:
print 'No, thanks!'
super(SongBird, self).__init__()
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def sing(self):
print self.sound
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