What's the best way to minimize the need of run time checks?

[Chris Angelico]

On Fri, Aug 12, 2016 at 7:38 PM, BartC <bc at freeuk.com> wrote:
> You can be too dynamic. Take an example like this:
>
>  class date:
>      def __init__(self,d,m,y):
>          self.day=d
>          self.month=m
>          self.year=y
>
>  d=date(25,12,2015)
>
>  d.yaer=1999
>
>  print (d.day,d.month,d.year)
>
> 'year' has been spelled wrongly, but this error is not picked up by the
> byte-code compiler and will not immediately be detected at runtime either.
> It will be seen in my example only if someone notices the printout isn't
> what it should be.
>
> This would never get past a static language nor some that also have dynamic
> types.

Nor will it get past a lot of linters. Or unit tests. There are other solutions.

ChrisA