[Python-Dev] Assignment to class of module? (Autoloading? (Making Queue.Queue easier to use)) (original) (raw)

Greg Ewing greg.ewing at canterbury.ac.nz
Fri Oct 14 08:50:29 CEST 2005

Phillip J. Eby wrote:

I meant that just changing its class is a mutation, and since immutables can be shared or cached, that could lead to problems. So I do think it's a reasonable implementation limit to disallow changing the class of an immutable.

That's a fair point.

Although I was actually thinking recently of a use case for changing the class of a tuple, inside a Pyrex module for database access. The idea was that the user would be able to supply a custom subclass of tuple for returning the records. To avoid extra copying of the data, I was going to create a normal uninitialised tuple, stuff the data into it, and then change its class to the user-supplied one.

But seeing as all this would be happening in Pyrex where the normal restrictions don't apply anyway, I suppose it wouldn't matter if user code wasn't allowed to do this.

Greg

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