[Python-ideas] keyword for introducing generators

[Chris Angelico]

On Sun, Aug 17, 2014 at 7:46 AM, Neil Girdhar <mistersheik at gmail.com> wrote:
> I'm sure this has been suggested before, but I just spent two days trying to
> figure out why a method wasn't being called only to find that I'd
> accidentally pasted a yield into the function.  What is the argument against
> a different keyword for introducing generator functions/methods?

There are quite a few changes to a function based on its body, like
how the presence of assignment causes a name to be local unless
explicitly declared otherwise. It's not necessary to predeclare
everything.

But if you're having trouble with a function like that, maybe a little
decorator would help:

def announce(f):
    def inner(*a,**kw):
        print("Calling:",f.__name__)
        ret=f(*a,**kw)
        print("Return value is a",type(ret))
        return ret
    return inner

Decorate a function @announce, and it'll tell you (a) that it's being
called, and (b) what type its return value is. If that's a generator,
well, there's your answer.

ChrisA