Guido van Rossum wrote:
But for *immutable* objects (like numbers, strings and tuples) the implementation is free to use caching. In practice, I believe ints between -5 and 100 are cached, and 1-character strings are often cached (but not always).
Also, string literals that resemble Python identifiers are often interned, although this is not guaranteed. And this only applies to literals, not strings constructed dynamically by the program (unless you explicitly apply intern() to them).
Python 2.3.4 (#1, Jun 30 2004, 16:47:37)
[GCC 3.2 20020903 (Red Hat Linux 8.0 3.2-7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> "foo" is "foo"
True
>>> "foo" is "f" + "oo"
False
>>> "foo" is intern("f" + "oo")
True-- Greg Ewing, Computer Science Dept, +--------------------------------------+ University of Canterbury, | A citizen of NewZealandCorp, a | Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. | [EMAIL PROTECTED] +--------------------------------------+ _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
