[Python-projects] Assertions, type checking, and testing

[Maarten ter Huurne]

You wrote on 2006-06-22 09:27:16 PM:

> On Thu, 22 Jun 2006, Maarten ter Huurne wrote:
> [...]
> > strict. For example, an iteration always ends with the StopIteration
> > exception being raised.
> [...]
> 
> I don't think that's quite true, is it?  AFAIK, the interpreter is free 
to 
> implement iteration over instances of builtin types without raising 
> StopIteration, for example.

It is possible indeed that the interpreter has special optimized paths for 
commonly used types. But I cannot know for sure without diving into the 
Python source code.

However, as soon as you deal with iterators explicitly, even on built-in 
types, StopIteration is raised. For example "iter([]).next()" raises it. 
Also, if you inherit from "list" and override "__iter__", that method is 
called. So if those optimisations are present, they are invisible to the 
user.

Bye,
                Maarten
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.logilab.org/pipermail/python-projects/attachments/20060626/dc0daf32/attachment.html