On Dec 8, 2008, at 11:59 AM, [EMAIL PROTECTED] wrote:
On Dec 6, 4:15 pm, Carl Banks <[EMAIL PROTECTED]> wrote:
On Dec 6, 12:47 am, "Patrick Mullen" <[EMAIL PROTECTED]> wrote:
Could I do something like this:
def a.add(b): return a+b
Outside of a class? Of course then that makes you think you could
do
5.add(6) or something craaaazy like that. (I mean, you can do
(5).__add__(6) but that's something else entirely)
I'd be inclined to think that this defines an instancemethod on an
existing object a. In other word, I'd read the following two lines
as
more or less equivalent.
def a.add(b): return a+b
a.add = lambda b: a+b
Just as the following are equivalent:
def foo(): return bar
foo = lambda: bar
I had been -0 on this, but now I think I'm -1.
This brings up another question, what would one use when referencing
method names inside the class definition?:
class C:
def self.method(arg):
self.value = arg
def self.othermethod(arg):
self.value = arg
# do this?
funcs = (self.method, self.othermethod)
# or this?
funcs = (method, othermethod)
On another related note, I would be interested in seeing this syntax
adopted for a different purpose...
Normally, if I'm defining a nested function that needs to be stored as
an object attribute, I have to use a dummy name, like the following:
class C:
def createfunc(self, arg):
def _dummy(arg):
return arg + 1
self.func = _dummy
It would be nice to be able to do the following instead:
class C:
def createfunc(self):
def self.func(arg):
return arg + 1
Or, after the class definition is done, to extend it dynamically:
def C.method(self, arg):
self.value = arg
...which would be the equivalent of the following:
def method(self, arg):
self.value = arg
C.method = method
Since functions are first-class objects, it seems perfectly reasonable
to me.
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I agree, this would be much nicer and would not require any special
cases. I'm not convinced that this is needed, but at least this won't
confuse newbies as much.
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