adding a simulation mode

[John Gordon]

In <mailman.2039.1342099220.4697.python-list at python.org> andrea crotti <andrea.crotti.0 at gmail.com> writes:

>     try:
>         copytree('sjkdf', 'dsflkj')
>         Popen(['notfouhd'], shell=True)
>     except Exception as e:
>         print("here")

> behaves differently from:

>     try:
>         Popen(['notfouhd'], shell=True)
>         copytree('sjkdf', 'dsflkj')
>     except Exception as e:
>         print("here")

> because if copytree fails it quits anyway.
> I also looked at the code but can't quite get why.. any idea?

copytree() could contain a call to sys.exit(), although that seems like
a rude thing to do.

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon at panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"