generator with subfunction calling yield

[Matimus]

The issue is that nn() does not return an iterable object. _nn()
returns an iterable object but nothing is done with it. Either of the
following should work though:

def nn():
    def _nn():
        print 'inside'
        yield 1
    print 'before'
    for i in _nn():
        yield i
    print 'after'

Or you could just return the iterable object that was returned by
_nn():

def nn():
    def _nn():
        print 'inside'
        yield 1
    print 'before'
    retval = _nn():
    print 'after'
    return retval

For clarification, using yeild creates a generator. That generator
returns an iterable object. Nesting generators does not somehow
magically throw the values up the stack. I made the same mistake when I
first started messing with generators too.

-Matt

andy.leszczynski at gmail.com wrote:
> Hi,
>
> I might understand why this does not work, but I am not convinced it
> should not - following:
>
> def nnn():
>     print 'inside'
>     yield 1
>
> def nn():
>     def _nn():
>         print 'inside'
>         yield 1
>
>     print 'before'
>     _nn()
>     print 'after'
>
>
> for i in nnn():
>     print i
>
> for i in nn():
>     print i
>
>
>
> gives results:
>
> $ python f.py
> inside
> 1
> before
> after
> Traceback (most recent call last):
>   File "f.py", line 18, in ?
>     for i in nn():
> TypeError: iteration over non-sequence
>
> while I would expect:
> $ python f.py
> inside
> 1
> before
> inside
> 1
> after
> 
> Any insight?
> 
> andy