Steven D'Aprano wrote: > On Sat, 23 Mar 2013 21:00:07 -0400, Roy Smith wrote: > >> In article <mailman.3657.1364085583.2939.python-l...@python.org>, >> Fabian von Romberg <fromberg...@hotmail.com> wrote: >> >>> Hi, >>> >>> I have a single questions regarding id() built-in function. >>> >>> example 1: >>> >>> var1 = "some string" >>> var2 = "some string" >>> >>> if use the id() function on both, it returns exactly the same address. >> >> Yup. > > Nope. Did you actually try it? > > > As far as I know, there is no Python implementation that automatically > interns strings which are not valid identifiers. "some string" is not a > valid identifier, due to the space.
I don't know about other implementations, but in CPython two equal strings in the *same* *compilation* will end up with the same id as a result of constant folding. In the interpreter: >>> a = "some string" >>> b = "some string" >>> a is b False >>> a = "some string"; b = "some string"; a is b True In a script: $ cat tmp.py a = "some string" b = "some string" print a is b $ python tmp.py True -- http://mail.python.org/mailman/listinfo/python-list
