Steven D'Aprano <st...@remove-this-cybersource.com.au> wrote: >On Sat, 29 Aug 2009 11:11:43 -0700, zaur wrote: > >> I thought that int as object will stay the same object after += but with >> another integer value. My intuition said me that int object which >> represent integer value should behave this way. > >If it did, then you would have this behaviour: > >>>> n = 3 # bind the name n to the object 3 >>>> saved_id = id(n) # get the id of the object >>>> n += 1 # add one to the object 3 >>>> assert n == 4 # confirm that it has value four >>>> assert id(n) == saved_id # confirm that it is the same object >>>> m = 3 # bind the name m to the object 3 >>>> print m + 1 # but object 3 has been modified >5 > >This would be pretty disturbing behaviour, and anything but intuitive.
Yes, indeed, and it's quite possible to write code like this in Fortran that produces exactly this result -- an integer constant gets modified. This used to get big yucks when we gathered around the keypunch, before we had the Obfuscated C Contest to amuse us. -- Tim Roberts, t...@probo.com Providenza & Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
