Python 3.6+ does have type annotations and multiple static analysis tools for type checking. Only an ignorant or biased person would yell at Python for flaws it doesn't have. For crucial business logic, one also writes unit tests.
> recent versions of Python have added type annotations that optionally allow the programmer to specify the types used in a program. However, Python’s type system is not capable of expressing many types and type relationships, does not do any automated typing, and can not reliably check all types at compile time. Therefore, using types in Python requires a lot of extra code, but falls far short of the level of type safety that other languages can provide.
Sometimes python is appropriate for production code, weak type system or no. Sometimes it isn't. As a project gets larger, more complex, and more interconnected with other things, static type systems become more useful.
End of story, surely? Didn't we all know that already?
You can write perfectly fine production level code in Python. It like lego block. Start with simple and then add on.
Adding compile type checks comes with its own demerits. I guess here Swift is trying to offer more tool chain on compiler level for model building rather than just being type safe.
Currently, programmers are forced to pepper the code with lots of ignore annotation comments and redundant union types, just because the type checkers aren’t smart enough.