[Python-ideas] Fwd: Define a method or function attribute outside of a class with the dot operator

[Markus Meskanen]

I've started working on a PEP for this since most people seem to be for it.
Will see how it turns out.

On Fri, Feb 10, 2017 at 2:13 PM, Joao S. O. Bueno <jsbueno at python.org.br>
wrote:

> I am definetelly -1 to this idea.
>
> But since you are discussing this seriously, one nice thing is to
> recall how Javascript does that:
> `function <name> () ` is an expression that returns the created
> function, and thus can be assigned to anything on
> the left side.
>
> Of course, that would throw us back to a way of thinking of inline
> definition of multiline functions -
> which is another requested and unresolved thing in Python.
>
> (But we might require the `def` statement to still be aligned, at
> least style-wise, and require
> people to write
>
> Foo.foo =\
> def (self, ...): ...
>
> )
>
> That said, this possibility in Javascript is the source of severe
> inconsistencies in how functions are declared across different
> libraries and projects, and IMHO, makes reading (and writting) a real pain.
>
> (And, as stated above, a two line decorator could make for the patching -
> it does not need to have such an ugly name as "monkey_patch" - it
> could be just "assign" instead)
>
>      js
>     -><-
>
> On 10 February 2017 at 09:51, Steven D'Aprano <steve at pearwood.info> wrote:
> > On Fri, Feb 10, 2017 at 10:05:30PM +1100, Chris Angelico wrote:
> >
> >> * What would the __name__ be? In "def ham.spam():", is the name "spam"
> >> or "ham.spam"?
> >
> > "spam" of course, just like it is now:
> >
> > py> class Ham:
> > ...     def spam(self):
> > ...             ...
> > ...
> > py>
> > py> Ham.spam.__name__
> > 'spam'
> >
> >
> > You might be thinking of __qualname__:
> >
> > py> Ham.spam.__qualname__
> > 'Ham.spam'
> >
> >
> >> Or say you have "def x[0]():" - is the name "x[0]" or
> >> something else?
> >
> > I wouldn't allow that. I feel that "any assignment target at all" is an
> > over-generalisation, a case of YAGNI.
> >
> > It is relatively easy to change our mind and add additional cases in the
> > future, but very difficult to remove them if they turn out to be a
> > mistake.
> >
> > My intuition tells me that we should allow :
> >
> >     def name dot name (args):
> >
> > possibly even more than one dot:
> >
> >     def name dot name dot name ... (args):
> >
> >
> > but no additional cases:
> >
> >     # syntax error
> >     def spam[0]function(): ...
> >
> >
> >
> >
> > --
> > Steve
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