Py was started by a Finnish developer Yuka Leto Salho. The type annotations that were introduced with pep 484 were sort of developed together with the static type checker. In most cases doing it statically before you ship your code to production is more efficient than doing it at runtime piece meal. I think to reference this sales pitchy blog post that says 75% of developers time is spent on debugging I would say that in some cases that might be okay It might be okay to pay the cost of performance for the catching of the types the type errors.

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