Python is DOOMED! Again!

Mark Lawrence breamoreboy at
Thu Jan 22 19:28:18 CET 2015

On 22/01/2015 18:14, Skip Montanaro wrote:
> On Thu, Jan 22, 2015 at 12:03 PM, Sturla Molden <sturla.molden at
> <mailto:sturla.molden at>> wrote:
>     Python will no longer be dynamic, it will just be a slow static
>     language.
>     Yes, Python could still be used as a dynamic language, but nobody will
>     allow you to do it. Even packages in widespread use will be banned
>     because
>     they don't typehint. And then there will be complaint about lack of such
>     packages.
> FUD? What evidence do you have that this will be the way things shake out?

Evidence in completely the opposite direction if I'm reading this 

"The main use case of type hinting is static analysis using an external 
tool without executing the analyzed program. Existing tools used for 
that purpose like pyflakes [pyflakes] or pylint [pylint] might be 
extended to support type checking. New tools, like mypy's mypy -S mode, 
can be adopted specifically for this purpose.

Type checking based on type hints is understood as a best-effort 
mechanism. In other words, whenever types are not annotated and cannot 
be inferred, the type checker considers such code valid. Type errors are 
only reported in case of explicit or inferred conflict. Moreover, as a 
mechanism that is not tied to execution of the code, it does not affect 
runtime behaviour. In other words, even in the case of a typing error, 
the program will continue running.

The implementation of a type checker, whether linting source files or 
enforcing type information during runtime, is out of scope for this PEP."

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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