On 2016-03-16 11:23, Sven R. Kunze wrote:
> for x in my_iterable:
> # do
> empty:
> # do something else
>
> What's the most Pythonic way of doing this?
If you can len() on it, then the obvious way is
if my_iterable:
for x in my_iterable:
do_something(x)
else:
something_else()
However, based on your follow-up that it's an exhaustible iterator
rather than something you can len(), I'd use enumerate:
count = 0 # have to set a default since it doesn't get assigned
# if no iteration happens
for count, x in enumerate(my_iterable, 1):
do_something(x)
if not count:
something_else()
I do a lot of ETL work, and my code often has to report how many
things were processed, so having that count is useful to me.
Otherwise, I'd use a flag:
empty = True
for x in my_iterable:
empty = False
do_something(x)
if empty:
something_else()
-tkc
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