[Python-ideas] Syntactic Sugar: Post-Conditions for Guard Clauses

Chris Barker chris.barker at noaa.gov
Thu May 17 16:18:59 EDT 2018

On Thu, May 17, 2018 at 12:55 PM, Manuel Barkhau <mbarkhau at gmail.com> wrote:

>               continue if not is_valid(elem)
>               ...

how is this better than:

if not is_valid(elem):


But even if it is, that might be a consideration for a new language, but
adding it to python now is pretty darn unlikely.

> When there is an expression involved for the case of a `return`
> or `raise` statement, I don't think it's such a great style,
> because the conditional gets hidden off to the right.

now I"m confused -- if it's not a great sytle, why suggest it?

and I was thinking that the one good thing is that the "return" or "break"
is  a bit more prominent -- which could be a good thing.

Alternatively, is there a good way I can implement this as a
> preprocessor for myself?

I'm pretty sure not -- python is very dynamic, but not let you redefine the
language semantics.

Other than as a import hook that re-wrote the code on the fly.

but really -- don't do that -- then no one else will understand your code.



Christopher Barker, Ph.D.

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Chris.Barker at noaa.gov
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