how to overload operator "< <" (a < x < b)?

exarkun at twistedmatrix.com exarkun at twistedmatrix.com
Fri Aug 7 17:02:13 CEST 2009


On 12:50 pm, benjamin.kaplan at case.edu wrote:
>On Fri, Aug 7, 2009 at 8:00 AM, dmitrey<dmitrey.kroshko at scipy.org> 
>wrote:
>>hi all,
>>is it possible to overload operator "<  <"? (And other like this one,
>>eg "<=  <=", ">  >", ">=  >=")
>>Any URL/example?
>>Thank you in advance, D.
>
>That isn't an operator at all. Python does not support compound
>comparisons like that. You have to do "a > b and b > c".

That's partially correct.  There is no "compound less than operator", or
whatever you want to call that.  However, Python does support "compound
comparisons" like that:

  >>> 1 < 2 < 3
  True
  >>> 1 < 3 < 2
  False
  >>> 1 == 2 == 3
  False
  >>> 2 == 2 == 2
  True
  >>>
Jean-Paul



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