On Wed, 20 May 2009 11:35:47 -0700, Jan wrote:
> Wouldn't it be easy for Python to implement generating functions so that
> the iterators they return are equipped with a __reset__() method?
No.
def gen():
for name in os.listdir('.'):
yield open(name).read()
os.remove(name)
How would you "easily" reset this generator so that it returns the same
values each time?
That's an extreme example, but as a general rule, generators/iterators
are one-shot: having consumed a value, you can't get it back again
without re-creating it from scratch, or possibly not even then. Here's a
less destructive example:
def gen():
for i in xrange(10):
yield time.time()
--
Steven
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