And also, returning errors by value does not introduce hidden control flow! In python, you have no way of knowing what(if any) exceptions that a function may th

And also, returning errors by value does not introduce hidden control flow! In python, you have no way of knowing what(if any) exceptions that a function may throw, so unless you catch everything you have no way of knowing where execution will end up after calling a function. Not to mention the intentionally(!) thrown exceptions for iterators. In my book, exceptions are goto by another name.