006_001 Python 温度标示的转换-优快云博客

本文链接：https://blog.youkuaiyun.com/houyj1986/article/details/23153345

本文通过 Python 代码示例介绍了多重继承的应用场景，包括不同类之间的方法调用和覆盖。此外，还实现了一个温度单位转换类，能够方便地进行摄氏度、华氏度等之间的转换。

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代码如下：

#encoding=utf-8



class Behave(object):
    def __init__(self,name):
        self.name=name
    def once(self):
        print 'Hello', self.name
    def rename(self,NewName):
        self.name = NewName
    def repeat(self,N):
        for i in range(N):
            self.once()


class Repeater(object):
    def repeat(self,N):
        print N*'---------'

Mixobj = Behave('John'),Behave('Lucy'),Repeater()

for obj in Mixobj:
    obj.repeat(3)

class SubClass(Behave):
    def once(self):
        print 'sub class,',self.name
    
subobj=SubClass('gray')
subobj.repeat(3)

class OneMore(Behave):
    def repeat(self,N):
        Behave.repeat(self, N)
        super(OneMore,self).repeat(N)

print '-------------show --super'
oneMoreObj=OneMore('onemore')
oneMoreObj.repeat(1)

#温度标示的转换

print '中国'

#核心利用get和set的默认读取和访问一个属性值，在内部已经设定好了对应维度的变量，获取的时候，只用计算就可以了
class Temperature(object):
    coefficients = {'c':(1.0,0.0,-273.15),
                    'f':(1.8,-273.15,32.0),
                    'r':(1.8,0.0,0.0)}
    def __init__(self,**kwargs):
        try:
            name,value=kwargs.popitem()
        except KeyError:
            name, value='k',0
        if kwargs or name not in 'kcfr':
            kwargs[name]=value
            raise TypeError,'invalid argumens %r' % kwargs
        setattr(self,name,float(value))
    def __getattr__(self,name):
        try:
            eq= self.coefficients[name]
        except KeyError:
            raise AttributeError, name
        return (self.k + eq[1]) * eq[0] + eq[2]
    def __setattr__(self, name, value):    
        if name in self.coefficients:            
            eq = self.coefficients[name]
            self.k = (value - eq[2]) / eq[0] - eq[1]
        elif name == 'k':            
            object.__setattr__(self, name, value)
        else:            
            raise AttributeError, name
    def __str__(self):        
        return "%s K" % self.k
    def __repr__(self):        
        return "Temperature(k=%r)" % self.k


print Temperature(f=70).c
Temperature(f=70)

打印结果如下：

Hello John
Hello John
Hello John
Hello Lucy
Hello Lucy
Hello Lucy
---------------------------
sub class, gray
sub class, gray
sub class, gray
-------------show --super
Hello onemore
Hello onemore
中国
21.1111111111