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Mon Feb 16 19:14:43 EST 2004 · https://mail.python.org/pipermail/python-dev/2004-February/042588.html

Martin:

> Of these, there are two categories of objects:
> - values:
> - identity objects:
> 
> Values fall into two further categories:
> - immutable values:
> - mutable values:

All these rules can be boiled down to:

  * Objects which compare equal should hash equal.
  * The notion of equality should not change over the
    lifetime of the object.

There's no need to mention mutability at all.

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

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[Python-Dev] bool does not want to be subclassed?