cascading python executions only if return code is 0
roy at panix.com
Sun Dec 22 20:17:53 CET 2013
In article <mailman.4500.1387739297.18130.python-list at python.org>,
Frank Cui <ycui at outlook.com> wrote:
> hey guys,
> I have a requirement where I need to sequentially execute a bunch of
> executions, each execution has a return code. the followed executions should
> only be executed if the return code is 0. is there a cleaner or more pythonic
> way to do this other than the following ?
> if a() == 0: if b() == 0: c()
> Thanks for your input.
Yup! Just do:
a() or b() or c()
The "or" operation has what's known as "short-circuit" semantics. That
means, if the first operand is true, it doesn't evaluate the second
operand. Just make sure that a(), b(), and c() all return something
which is true if they succeed and false otherwise.
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