What's an elegant way to test for list index existing?

[Glen D souza]

i have a approach, it may not be best

fld = [ ]
for data in shlex.split(ln):
       fld.append(data)



On Sat, 29 Sep 2018 at 07:52, <jladasky at itu.edu> wrote:

> On Friday, September 28, 2018 at 11:03:17 AM UTC-7, Chris Green wrote:
> > I have a list created by:-
> >
> >     fld = shlex.split(ln)
> >
> > It may contain 3, 4 or 5 entries according to data read into ln.
> > What's the neatest way of setting the fourth and fifth entries to an
> > empty string if they don't (yet) exist? Using 'if len(fld) < 4:' feels
> > clumsy somehow.
>
> How about this?
>
> from itertools import chain, repeat
> temp = shlex.split(ln)
> fld = list(chain(temp, repeat("", 5-len(temp))))
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>