On 06/10/2010 10:47 PM, Anthony Papillion wrote:
> Someone helped me with some code yesterday and I'm trying to
> understand it. The way they wrote it was
>
> subjects = (info[2] for info in items)
This is a generator expression, and it creates a generator object. If
you loop over it (subjects), you will get all the subjects (or whatever
info[2] is), one by one.
>
> Perhaps I'm not truly understanding what this does. Does this do
> anything different than if I wrote
>
> for info[2] in items
> subject = info[2]
These two snippets do the same thing:
# No. 1.
subjects = (info[2] for info in items)
for subject in subjects:
print (subject)
# No. 2.
for info in items:
subject = info[2]
print (subject)
However, you could also pass the subjects variable to another function
and have it iterate over them - that's something that the simple loop
can't do just like that.
>
> Thanks!
> Anthony
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