Application-global "switches"?

[Marius Gedminas]

On Sep 4, 9:29 pm, kj <no.em... at please.post> wrote:
> The only solution I can come up with is to define a "dummy module",
> say _config.py, which contains only upper-case variables representing
> these global switches, and is imported by all the other modules in
> the application with the line "from _config import *".  During the
> early stages of the run, the script inspects the command-line flags,
> and if it finds a --continuing flag, it sets the variable
> _config.CONTINUATION_MODE to True.  (The last point implies that
> these variables are not strictly speaking read-only, since they
> most be set at the beginning of the run.  But after this initial
> setting, they should remain read-only.)

Be very very careful about "from _config import *".  If you import
a module that, in turn, imports _config this way, before you set
the initial values, that module will already have made its own copies
of all the variables and thus will not see the correct values.