what are generators?

[castironpi at gmail.com]

On Mar 25, 7:36 pm, Miki <miki.teb... at gmail.com> wrote:
> On Mar 24, 8:17 am, castiro... at gmail.com wrote:
>
> > I'm looking for a cool trick using generators.  Know any exercises I
> > can work?
>
> Simple one the comes to mind is flattening a list:
>
> >>> list(flatten([1, [[2], 3], [[[4]]]]))
> [1, 2, 3, 4]

I don't think it's well-defined.  (But this is impossible and useless
calling.)  CMIIW?

This is generic:

>>> def f():
...     __gen= None
...     def g():
...             i= 0
...             while 1:
...                     i+= 1
...                     yield __gen( i )
...     def set( gen ):
...             nonlocal __gen
...             __gen= gen
...     return g, set
...
>>> a, set= f()
>>> b= a()
>>> set( lambda x: print( x ) )
>>> next( b )
1
>>> next( b )
2
>>> next( b )