Hi folks,
it is possible to close a generator. That is (among others) for the
following case:
I run a for loop over the iterator, but then I break it. Now I can leave
the generator to the GC (which is AFAI have been told a thing which I
should not do), or I can clean up myself.
Example:
for i in g:
if i is not None:
g.close()
return i
or better
try:
for i in g:
if i is not None:
return i
finally:
g.close()
or even better
with contextlib.closing(g):
for i in g:
if i is not None:
return i
How do you do that in this case - do you just drop the generator, or do
you close it? (Beware of exceptions which could happen!) Till now, I
used to just drop it, but now I am thinking about if it is good style or
not...
Another question: AFAICT generator.close() was introduced at about the
same time as the with statement. Was a matching context manager
deliberately left away, or just forgotten? It is fine to work with
"with" on a file or other closable object - why not on a generator,
without contextlib.closing()?
TIA,
Thomas
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