Python: Why can't I iterate over a list? Is my exception class borked?

The iter method should return an iterator object, but you are returning a list object. Use def __iter__(self): return iter(self. _values) instead to fix this.

From the documentation for object. __iter (my highlighting): This method is called when an iterator is required for a container. This method should return a new iterator object that can iterate over all the objects in the container.

The __iter__ method should return an iterator object, but you are returning a list object. Use def __iter__(self): return iter(self. _values) instead to fix this.

From the documentation for object. __iter__ (my highlighting): This method is called when an iterator is required for a container. This method should return a new iterator object that can iterate over all the objects in the container.

Thanks Torsten Marek. I'll paste my new version that works below. – orokusaki Feb 1 '10 at 22:42.

Def __iter__(self): return iter(self. _values) Or a more generic: def __iter__(self): for x in self. _values: yield x.

Meh, it stays anyway. :) – Lennart Regebro Feb 1 '10 at 22:42 Ah, thanks. Your second version helps me understand better too.

Isn't the second version a generator? Does it perform differently than the first version? – orokusaki Feb 1 '10 at 22:44 BTW +1 vote.

Thanks. – orokusaki Feb 1 '10 at 22:44 @orokusaki: It is a generator, indeed. I'd expect it to be a bit slower, but I haven't tested it.

The important difference is that you can do things to x before yielding it. – Lennart Regebro Feb 1 '10 at 22:47.

Iter__ needs to return an iterator, not a list. Try this: def __iter__(self): return iter(self. _values) You could also do: def __iter__(self): for val in self.

_values: yield val But I can't really think of a reason you'd need to do that instead of using iter().

1 vote for you too. Sometimes answers come too fast here. – orokusaki Feb 1 '10 at 22:44.

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