cascading python executions only if return code is 0

[Gregory Ewing]

Frank Cui wrote:
> 
> Someone else wrote:
>  >
>  > Frank, welcome to the group. Common convention is to put your response
>  > below the exiting message, so that the conversation continues down 
> the page.
>
> Thanks for informing the rules.

He forgot to mention the most important rule,
which is:

DON'T quote the entire message you're replying to!

Only quote small pieces of it, like I did above,
just enough to establish context. Then put your
reply to that point under the quoted text.

-- 
Greg