Problem with filter()

[Jerry Hill]

On 4/3/07, Boudreau, Emile <Emile.Boudreau at cognos.com> wrote:
> Sorry folks my mistake def is_dev should be:
> def is_Dev(stringy):
>   stringx = stringy.split('-')
>   if stringx[0] == '':
>     if stringx[1] == r'win32':
>       if stringx[2] == r'app':
>         if stringx[4] == r'dev.tar.gz':
>           return 1
>
> But now the results of the filter is an empty list and i know it shouldn't
> be.

Well, you haven't told us what you expect the result to be, but as far
as I can tell, an empty list is the correct answer, because you don't
have any files in your list that match your rules.

This line
>   if stringx[0] == '':
is very likely your problem.  That requires that your file start with
a '-', so that after you split it stringx[0] will equal ''.

You may need something more like this:
def is_Dev(stringy):
    print stringy
    try:
        stringx = stringy.split('-')
        if stringx[1] == r'win32':
            if stringx[2] == r'app':
                if stringx[4] == r'dev.tar.gz':
                    return 1
    except IndexError, e:
        pass

That will still give you an empty list when run on your proposed
inputs though, because none of them are of the form
<something>-win32-app-<something>-dev.tar.gz

If this doesn't help, please give us some sample inputs and what you
expect the output to be.

-- 
Jerry