如何实现Python __lt__ __gt__自定义（重载）运算符？
Python具有神奇的方法来定义运算符的重载行为。比较运算符（<，<=，>，>=，==和！=）可以通过为__lt__，__le__，__gt__，__ge__，__eq__和__ne__魔术方法提供定义来重载。遵循程序重载<和>运算符以比较距离类的对象。
class distance:
def __init__(self, x=5,y=5):
self.ft=x
self.inch=y
def __eq__(self, other):
if self.ft==other.ft and self.inch==other.inch:
return "both objects are equal"
else:
return "both objects are not equal"
def __lt__(self, other):
in1=self.ft*12+self.inch
in2=other.ft*12+other.inch
if in1<in2:
return "first object smaller than other"
else:
return "first object not smaller than other"
def __gt__(self, other):
in1=self.ft*12+self.inch
in2=other.ft*12+other.inch
if in1<in2:
return "first object greater than other"
else:
return "first object not greater than other"
d1=distance(5,5)
d2=distance()
print (d1>d2)
d3=distance()
d4=distance(6,10)
print (d1<d2)
d5=distance(3,11)
d6=distance()
print(d5<d6)结果显示了__lt__和_gt__魔术方法的实现
first object not greater than other first object not smaller than other first object smaller than other