> Back on March 10 in the thread on PEP 285 Guido wrote: > > """ > This is a very general rule that I like a lot: that the type of a > result should only depend on the type of the arguments, not on their > values. I expect that this rule will make reasoning about programs > (as in PsyCo or PyChecker) easier to do. > > I recently caved in and allowed an exception: 2**2 returns an int, but > 2**-2 returns a float. This was a case of "practicality beats > purity". I don't see True-1 in the same league though. > """ > > And yet...: > > >>> type(2**10) > <type 'int'> > >>> type(2**100) > <type 'long'> > > ...doesn't this apply to many operators on ints in 2.2? Yet _another_ > (set of) exception(s) with practicality beating purity? Perhaps, but if a > "very general rule" has so many exceptions in frequent and fundamental > cases, is it a rule at all...? Oh, go away. That's part of PEP 237. --Guido van Rossum (home page: http://www.python.org/~guido/)
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