tinker Form question(s)

[Peter Otten]

Steve wrote:

> I am not sure how to post the code for my file here, is copy/paste the
> best way?

Yes. Try to paste only the relevant parts, or, if possible, post a small 
self-contained example that can be run by the reader without further 
editing.

> Is there another? I understand that attachments are stripped
> off.
> 
> """
> The following segment of code returns values of "spec".
> I would like to have it return the associated value of
> "DataLine" with each spec. It would also be nice to understand
> how this code works to hold/return the information.
> 
> In pseudocode, a line something like:
> 
>         DataReturned = DataLine + " " + spec)
>         New_Specs.append(DataReturned)
>         
> explains what I would like to have returned.

>      return ([spec.get()for spec in New_Specs])

[spec.get() for spec in New_Specs]

is called "list comprehension" and is syntactic sugar for a list-creating 
loop like

result = []
for spec in New_Specs:
    result.append(spec.get())


The relevant parts of the loop where you set up the GUI and the New_Specs 
list:

>      New_Specs = []
>      for lineItem in range(len(ThisList)):
>          DataLine, Spec = GetLineByItem(ThisList[y])
...
>          NewSpec = tk.StringVar()
>          New_Specs.append(NewSpec)

First, using range(len(ThisList)) is almost always superfluous as you can 
iterate over the list directly. In your case:

>      New_Specs = []
       for item in ThisList:
>          DataLine, Spec = GetLineByItem(item)
...
>          NewSpec = tk.StringVar()
>          New_Specs.append(NewSpec)

Now, as you need DataLine later-on why not keep a copy? So let's turn 
New_Specs into a list of StringVar, DataLine tuples:

>      New_Specs = []
       for item in ThisList:
>          DataLine, Spec = GetLineByItem(item)
...
>          NewSpec = tk.StringVar()
           New_Specs.append((NewSpec, DataLine))

When the function terminates (there is a mainloop() missing) you can create 
and return the result:

    # long form, with a loop
    result = []
    for spec, dataline in New_Specs:
        result.append(dataline + " " + spec.get())
    return result

    # alternative using a listcomp:
    return [dataline + " " + spec.get() for spec, dataline in New_specs]