cascading python executions only if return code is 0

[Grant Edwards]

On 2013-12-27, Roy Smith <roy at panix.com> wrote:
> In article <mailman.4567.1387819120.18130.python-list at python.org>,
>  Ethan Furman <ethan at stoneleaf.us> wrote:
>
>> Mostly I don't want newbies thinking "Hey!  I can use assertions for all my 
>> confidence testing!"
>
> How about this one, that I wrote yesterday;
>
>         assert second >= self.current_second, "time went backwards"
>
> I think that's pretty high up on the "can never happen" list.

It's not that high (depending on where you're getting "second" from).
If the "second" is from the time of day, and the NTP daemon (or the
system admin) decides the clock needs a stepwise adjustment, the time
of day can go backwards.

-- 
Grant