[Python-Dev] bool does not want to be subclassed?
Greg Ewing
greg at cosc.canterbury.ac.nz
Mon Feb 16 19:14:43 EST 2004
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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