> for item in cart.values():
> v = _button_cart % {"idx": idx,
> "itemname": item.name,
> "amount": item.cost,
> "quantity": item.quantity,}
> cartitems.append(v)
>
>
> What does the % operator is doing there?
Unless _button_cart is some funky object with its modulo-operator
overloaded, _button_cart is likely a string. For strings, the
"%" does string formatting. If the RHS is a dict (in this case),
it's flexible and allows for named lookups
Thus, _button_cart likely contains something like
_button_cart = """
%(idx)s
========
The user bought %(quantity)s %(itemname)s.
They cost $%(amount)0.02f"""
You're likely already familiar with the case when the RHS is a
tuple/list instead of a dict:
s = "I have %i tests to take on %s" % (
test_count, day_of_week)
You can read the nitty-gritty details at
http://docs.python.org/lib/typesseq-strings.html
-tkc
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