mirroring text window to file

[Alex Martelli]

Marcel Achim wrote:

> I was wondering if there's an existing solution other than writing
> to both a file and an output text window (Tk text widget), as in :
> 
>    text_window.insert('end', output)
>    log_file.write(output)

Depends to what "problem" you want an "existing solution" for.  For
the purpose of having some string be appended to both a file and a
text window, you do need these two calls to happen _some_where, but
you can arrange for that to happen in several different ways, mostly
by exploiting the concept of "filelike objects" -- it all depends
on what, exactly, you're trying to accomplish.  E.g.:

class LogAndText:
    def __init__(self, thewindow, thefile):
        self.thewindow = thewindow
        self.thefile = thefile
    def write(self, stuff):
        self.thewindow.insert('end', stuff)
        self.thefile.write(stuff)

now you can instantiate

logansho = LogAndText(text_window, log_file)

and just usr logansho as if it was a file open for output (e.g.
you can print>>logansho,whatever -- you can set logansho as
sys.stdout so that all normal print statements will use it -- &c).


Alex