is and ==

[Mark Jackson]

"Dave Brueck" <dbrueck at edgix.com> writes:

> The interpreter "caches" integer objects from something like -1 to 100, so
> 'is' evaluates to true for low integers but not higher integers.
> 
> (Also, as the docs point out, this caching means that from inside an
> extension module you could _redefine_ the value of the integer object 5, for
> example:
> 
> >>> evilext.causehavoc(5,10) # sets '5' object to have int value of 10
> >>> 5 + 5
> 20  # Whee!!!

Woah.  Fortran flashbacks. . .

-- 
Mark Jackson - http://www.alumni.caltech.edu/~mjackson
	Having your book made into a movie is like having
	your ox made into a bouillon cube.
				- Bill Neely