[Cython] generators

[Stefan Behnel]

Hi,

Robert Bradshaw wrote:
> On Jul 11, 2008, at 8:04 AM, Stefan Behnel wrote:
>> 1)
>>
>> def f():
>>     x = 1
>>     def a(): print x
>>     def b(): print x
>>     return (a,b)
> 
> There will be a cdef class created for a and b, as well as one  
> representing the scope of f, with a __call__ method containing the  
> body of the function. The def a() and def b() lines would instantiate  
> this class and assign them to local variable a and b (which have a  
> reference to the containing scope). When both of these are collected,  
> the scope will be as well.

Yes, that sounds correct to me.


>> 2)
>>
>> for i in range(10):
>>     def a(): print i
>>     a()
>>
>> (outputs 0-9 in Python)
> 
> This isn't an inner function at all. To fix the scoping rules, "def"  
> would create a function at the top level, and then do an assignment  
> to the variable "a."

I actually meant it to be an inner function of a function, so this wasn't a
clear example. But I can see that this would be handled the same way as above.

So, yes, I'm happy with that implementation. I just came up with these
examples when I was discussing the topic with some people at EuroPython, and I
couldn't really tell them how we would handle that.

Stefan