"Jussi Piitulainen" wrote:
Frank Millman writes:
> It would be nice to write a generator in such a way that, in addition
> to 'yielding' each value, it performs some additional work and then
> 'returns' a final result at the end.
>
> From Python 3.3, anything 'returned' becomes the value of the
> StopIteration
> exception, so it is possible, but not pretty.
>
> Instead of -
> my_gen = generator()
> for item in my_gen():
> do_something(item)
> [how to get the final result?]
>
> you can write -
> my_gen = generator()
> while True:
> try:
> item = next(my_gen())
> do_something(item)
> except StopIteration as e:
> final_result = e.value
> break
>
> Is this the best way to achieve it, or is there a nicer alternative?
Like this, and imagination is the limit:
def generator(box):
yield 1
box.append('won')
yield 2
box.append('too')
yield 3
box.append('tree')
mabox = []
for item in generator(mabox): pass
print(*mabox)
# prints: won too tree
That is neat. Thanks
Frank
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