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Re: Checking function's parameters (type, value) or not ?

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On 06/04/2016 14:07, ast wrote:
> Hello
>
> I would like to know if it is advised or not to test
> a function's parameters before running it, e.g
> for functions stored on a public library ?
>
> Example:
>
> def to_base(nber, base=16, use_af=True, sep=''):
>
>     assert isinstance(nber, int) and nber >= 0
>     assert isinstance(base, int) and base >= 2
>     assert isinstance(use_af, bool)
>     assert isinstance(sep, str) and len(sep) == 1
>
>    tbc
>
> With these tests, you are sure that the function to_base is
> well used. But it slows down the program.
> Without, python interpreter may crash later in the function
> or worse provide a meaningless result.
>
> What library designers do ?
>


Please see 
http://ftp.dev411.com/t/python/python-list/13bhcknhan/when-to-use-assert

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence

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Thread

Checking function's parameters (type, value) or not ? "ast" <nomail@com.invalid> - 2016-04-06 15:07 +0200
  Re: Checking function's parameters (type, value) or not ? Chris Angelico <rosuav@gmail.com> - 2016-04-06 23:27 +1000
  Re: Checking function's parameters (type, value) or not ? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-04-06 14:29 +0100
    Re: Checking function's parameters (type, value) or not ? "ast" <nomail@com.invalid> - 2016-04-06 16:18 +0200
      Re: Checking function's parameters (type, value) or not ? "ast" <nomail@com.invalid> - 2016-04-06 19:49 +0200
  Re: Checking function's parameters (type, value) or not ? Steven D'Aprano <steve@pearwood.info> - 2016-04-07 02:30 +1000

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