[Tutor] A Multiple Concatenation Problem

[Mats Wichmann]

On 9/19/20 5:59 PM, Alan Gauld via Tutor wrote:
> On 19/09/2020 23:26, Stephen P. Molnar wrote:
> 
>> 2-Phloroeckol.1.log
> ...
>> 2-Phloroeckol.9.log
>> 2-Phloroeckol.10.log
>> 7-Phloroeckol.1.log
>> 7-Phloroeckol.2.log
> ...> 7-Phloroeckol.10.log
>> Aloeemodin.1.log
>> Aloeemodin.2.log
>> <...cut...>
>> Vescalagin.10.log
>> .1.log    |
>> .2.log    |
>> .3.log    |
>> .4.log    |
>> .5.log    |     <-- not sure where these came from, but the rest is 
>> exactly what I wannted.
> 
> 
> It suggests you have an empty line at the end of your file.
> If you don;t like these simply add a check that ligand
> is not "" before creating the filename.
> 
>     if ligand:
>        for suf in range(1, 11):
>            filename = f"{ligand[:-1]}.{suf}.log"
> 
> Blank lines in the input will then be ignored.
> 

all of this is part of the general topic of validating your inputs: if
you're getting stuff from a file something else had generated, you
shouldn't just blindly proceed on the basis it's all correct and in the
format you expect: "Trust, but Verify"  :)