Resume after exception

Dan Sommers me at privacy.net
Tue Jun 14 13:59:31 CEST 2005


On Tue, 14 Jun 2005 10:09:30 +0100,
"Richard Lewis" <richardlewis at fastmail.co.uk> wrote:

> Hi there,
> Is it possible to have an 'except' case which passes control back to the
> point after the exception occurred?

Not that I can think of.

[ example of "interrupting" a file-reading function in order to ask the
    user if they really want to read a locked file ]

I would rewrite that this way (untested, and without error checking):

    def open_file(file_name, read_if_locked=False):
        f = file(file_name)
        [read first line]
        if first_line == "FILE LOCKED" and read_if_locked == FALSE:
            return False
        [read the rest]
        return True

    def open_command():
        if open_file("foo.bar") == False:
            [ask the user what to do]
            if ans == tkMessageBox.YES:
                open_file("foo.bar", True )

Regards,
Dan

-- 
Dan Sommers
<http://www.tombstonezero.net/dan/>



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