Generator Question

[Steven D'Aprano]

On Wed, 21 Dec 2011 21:45:13 -0800, GZ wrote:

> Now the question here is this:
> 
> def h():
>     if condition=true:
>        #I would like to return an itereator with zero length
>     else:
>        for ...: yield x
> 
> In other words, when certain condition is met, I want to yield nothing.
> How to do?

Actually, there's an even easier way.

>>> def h():
...     if not condition:
...         for c in "abc":
...             yield c
... 
>>> 
>>> condition = False
>>> list(h())
['a', 'b', 'c']
>>> condition = True
>>> list(h())
[]




-- 
Steven