[Edu-sig] python versus __python__

Kirby Urner urnerk at qwest.net
Mon Oct 24 01:32:38 CEST 2005

> Kirby
> PS:  since you've been studying subclassing primitive types using __new__,
> maybe you could show us a user-defined floating point type that reports
> two numbers equal if their absolute value difference is less than e.  
> Anyone?

Like this I guess:

 >>> class Fuzzy(float):
	 tol = 1e-8
       def __new__(cls, arg=0.0):
		return float.__new__(cls, arg)

	 def __eq__(self, other):
		if abs(self-other)<self.tol:
			return True
			return False

 >>> j = Fuzzy(10)
 >>> type(j)
 <class '__main__.Fuzzy'>

 >>> k = Fuzzy(10.000000001)

 >>> j == k

 >>> k = Fuzzy(10.01)

 >>> j == k


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