On Dec 20, 4:15 pm, Robert Latest <[EMAIL PROTECTED]> wrote:
> Steven D'Aprano wrote:
[...]
> > All methods are attributes (although the opposite is not the case), so if
> > a method doesn't exist, you will get an AttributeError.
>
> I see. I've already gathered that Python likes to use different words for
> common things (attribute instead of member or method).
..we were hoping it would make you feel comfy when coming from
Perl ;-)
On a more serious note, Python is actually quite semantically regular:
a dot (.) always means the same thing, as do parens. It might not be
immediately obvious exactly _what_ it means if you're coming from
languages that confuse issues with syntactic sweetness.
When you see code that says
foo.bar(baz)
there are two distinct operations happening, namely
tmp = foo.bar # attribute lookup (the dot-operator)
tmp(baz) # function call (the paren-operator)
this will give you the insight to one of the first optimization
methods you can use if a loop is a bottleneck
for i in range(100000):
foo.bar(i) # profiling says this is a bottleneck
attribute lookup hoisting optimization
tmp = foo.bar # move attribute lookup outside the loop
for i in range(100000):
tmp(i)
in the interest of full disclosure, I should probably mention that I'm
of course lying to you ;-) You can override both attribute lookup and
function call in your own classes, but (a) that shouldn't be important
to you at this point *wink*, and (b) at that level Python is quite
semantically regular.
-- bjorn
--
http://mail.python.org/mailman/listinfo/python-list
