slow try statements in python?

[Erik Max Francis]

Mark Higgins wrote:

> I've seen quite a few examples of python code where try statements are
> used to control the flow of a program... seems reasonable, but with my
> background in C++ I'm always concerned that try statements are slow.
> 
> Is this a concern in python?

No, since they're already de facto used for flow control in certain
circumstances.

Besides, even in C++, the idea is that the _throwing_ of an exception
might be expensive, but the defensive handling of one with a try...catch
clause should be very cheap.

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