On Wed, 16 Mar 2016 11:47:31 +0100, Peter Otten wrote:
> Sven R. Kunze wrote:
>
>> Hi,
>>
>> a colleague of mine (I write this mail because I am on the list) has
>> the following issue:
>>
>>
>> for x in my_iterable:
>> # do
>> empty:
>> # do something else
>>
>>
>> What's the most Pythonic way of doing this?
>
> What would you expect?
>
>>>> class Empty(Exception): pass
> ...
>>>> def check_empty(items):
> ... items = iter(items)
> ... try:
> ... yield next(items)
> ... except StopIteration:
> ... raise Empty ... yield from items ...
>>>> try:
> ... for item in check_empty("abc"): print(item)
> ... except Empty: print("oops")
> ...
> a
> b
> c
>>>> try:
> ... for item in check_empty(""): print(item)
> ... except Empty: print("oops")
> ...
> oops
>
> I'm kidding, of course. Keep it simple and use a flag like you would in
> any other language:
>
> empty = True:
> for item in items:
> empty = False ...
> if empty:
> ...
or even use the loop variable as the flag
item=None
for item in items:
#do stuff
if ex is None:
#do something else
--
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-- Eric Segal, "Love Story"
That's the most ridiculous thing I've ever heard.
-- Ryan O'Neill, "What's Up Doc?"
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