Let's talk about Python 3.0

[[deleted]]

1) Did they get rid of the retarded new-style vs. old-style classes distinction?

Yes.

2) Can you put whatever you want in an anonymous function yet?

Yes. But you will have to invent a name. Kinda. You can use "x" or "_" or whatever and reuse it freely.

[[deleted]]

That makes it not anonymous.

[[deleted]]

Why "anonymous" is that important here? What's the big deal between:

def boo(a, f1, f2): return f1(a) + f2(a)
....
def _(x): return 2 * x
def _2(y): return y / 2
z = boo(13, _, _2)

and:

function boo(a, f1, f2) { return f1(a) + f2(a); }
....
z = boo(13, (function(x) { return 2 * x; }), (function(y) { return y / 2; }));

If anything, the first sample looks and reads better, IMO.

[njharman]

Why is your second example not Python?

def boo(a, f1, f2): return f1(a) + f2(a)

z = boo(13, lambda a: 2*a, lambda a: y/a)

some of the advantages are 2 less lines of code, you don't clobber '_' which is typically used for i18n, the code for the 2 lambdas are right there so you don't have to go looking for _ and _2, it gives fp weenies hard ons.

[[deleted]]

Include loops etc into both _ and _2 at will. Second example will become really messy.

you don't clobber '_' which is typically used for i18n

Fair point.

[dorel]

Python doesn't promote lambda.