"Bulba!" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Hello Mr Everyone,
>
> From:
> http://docs.python.org/tut/node11.html#SECTION0011900000000000000000
>
> "Define a __iter__() method which returns an object with a next()
> method. If the class defines next(), then __iter__() can just return
> self:"
>
> The thing is, I tried to define __iter__() directly without explicit
> defining next (after all, the conclusion from this passage should
> be that it's possible).
I don't get that from the passage quoted, at all, although it is somewhat
opaque. It says that your __iter__() method must *return an object* with a
next() method; your __iter__() method below doesn't return such an object,
but instead returns a string. It then says that *if* your class defines
next(), which yours doesn't, __iter__() can return self.
[spaces inserted; you should note that many newsreaders strip the TAB
character...]
> class R:
> def __init__(self, d):
> self.d=d
> self.i=len(d)
> def __iter__(self):
> if self.i == 0:
> raise StopIteration
> self.i -= 1
> return self.d[self.i]
>
Solution: replace "__iter__" with "next" in the class definition above,
then add to the end:
def __iter__(self):
return self
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