[Tutor] Question about startswith() and endswith() in 2.5

[Dick Moores]

At 09:04 AM 9/25/2006, Carroll, Barry wrote:

>Hello, Dick.
>
>Let's compare your final startswith method and the endswith method in
>is_image_file:
>
> >>>>>>>
>s.startswith("er","q","ty")
>filename.endswith(('.gif', '.jpg', '.tiff'))
> >>>>>>>
>
>Notice that, while startswith has THREE parameters, endswith has only
>ONE.  ('.gif', '.jpg', '.tiff') is a tuple, and the interpreter sees it
>as a single parameter.  In other words your method is passing the
>following parameters:
>
>         prefix = "er"
>         start = "q"
>         end = "ty
>
>while the example method is passing:
>
>         suffix = ('.gif', '.jpg', '.tiff')
>         start = None
>         end = None
>
>Does that make sense?

Sure does now.

Thanks, Barry

Dick