Hi,
On 03/01/17 22:14, Deborah Swanson wrote:
...you have to create the generator object first and use it to call the
next function. And I really don't think you can use a generator as your
range in a for loop. So I'd use a 'while True', and break out of the
loop when you hit the StopIteration exception:
files = rootobs()
while True:
try:
file = files.next()
except StopIteration:
break
base = os.path.basename(file.name)
.
.
.
(etc)
What you have done there is taken an understanding of the underlying
machinery that allows the 'for' loop to be syntactic sugar over any
iterable and spelled it out, instead of just using 'for'! Without all
that, your example is:
for file in rootobs():
base = os.path.basename(file.name)
.
.
.
(etc)
[In fact, the machinery would also cope with the return value from
rootobs() being an iterable but not an iterator by using "files =
iter(rootobjs)"].
You seem to be reading up on how the stuff works under the covers (i.e.,
from the point of view of an implementer of a class or library) and then
suggesting that that's what the *caller* of that class or library needs
to do. They don't - for a caller, 'for x in seq:' is all they need to
know - the mechanics are handled by the interpreter coupled with the
dunder methods that the class may implement.
E.
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