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

Steven D'Aprano steve at pearwood.info
Fri Feb 10 06:51:59 EST 2017

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> Ham.spam.__name__

You might be thinking of __qualname__:

py> Ham.spam.__qualname__

> 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 

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(): ...


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