On 12/9/2013 05:10, zubair alam wrote:
> <div dir="ltr"><div>class PizzaShop():</div><div> pizza_stock =
> 10</div><div> def get_pizza(self):</div><div> while
> PizzaShop.pizza_stock:</div><div> PizzaShop.pizza_stock -=
> 1</div><div> yield "take yours pizza order, total pizzas left
> {}".format(PizzaShop.pizza_stock)</div>
> <div><br></div><div>mypizza_shop = PizzaShop()</div><div>pizza_order =
> mypizza_shop.get_pizza() </div><div># print
> "{}".format(repr(pizza_order.next()))</div><div><br></div><div>for
> order in pizza_order:</div><div>
> <span class="" style="white-space:pre"> </span>print
> "{}".format(repr(order))</div><div><br></div><div>domino_pizza_store
> = mypizza_shop.get_pizza()</div><div>print
> "{}".format(repr(domino_pizza_store.next()))</div>
> <div><br></div><div>mypizza_shop.pizza_stock =
> 10</div><div><br></div><div>domino_pizza_store =
> mypizza_shop.get_pizza()</div><div>print
> "{}".format(repr(domino_pizza_store.next()))</div><div><br></div><div><br>
> </div><div>can't we again use the same object mypizza_shop once its
> generator is exhausted</div></div><div class="gmail_extra"><br><br><div
> class="gmail_quote">On Thu, Sep 12, 2013 at 6:53 AM, Marc Tompkins <span
> dir="ltr"><<a href="mailto:[email protected]";
> target="_blank">[email protected]</a>></span> wrote:<br>
Please use text email, not hmtl. The indentation of your program was
messed up in places, and I can't tell whether it was you or the email
program that messed it up. This is a text newgroup, and html doesn't
work reliably.
As Alan has said, you're confusing class attributes with instance
attributes. But I wonder if the mistake is actually the reverse of what
he says.
Do you intend that an instance of PizzaShop refers to a particul pizza
shop, and that it has its own inventory, independent of all other pizza
shop instances? in that case all use of the class attribute
pizza_stock = 10 is bogus.
To re-iterate the other point Alan made, an iterator is *required* to
continue to throw Stopiteration once its exhausted and has thrown it
once, even if new items show up that it could have used.
But you can readily make a new iterator from the same mypizza_shop, once
you set its pizza_stock to a nonzero value.
--
DaveA
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