[Python-Dev] Why should the default hash(x) == id(x)?

Greg Ewing greg.ewing at canterbury.ac.nz
Thu Nov 3 01:39:44 CET 2005

Noam Raphael wrote:

> 3. If someone does want to associate values with objects, he can
> explicitly use id:
> dct[id(x)] = 3.

This is fragile. Once all references to x are dropped,
it is possible for another object to be created having
the same id that x used to have. The dict now
unintentionally references the new object.

Greg Ewing, Computer Science Dept, +--------------------------------------+
University of Canterbury,	   | A citizen of NewZealandCorp, a	  |
Christchurch, New Zealand	   | wholly-owned subsidiary of USA Inc.  |
greg.ewing at canterbury.ac.nz	   +--------------------------------------+

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