Chapter 17.6.3. Exception Handling
Analogous to error_handler() and tg_errors, TurboGears provides exception_handler() and tg_exceptions for handling program exceptions.
When no applicable exception handler is defined, the exception is passed to a lower layer (for example, CherryPy).
If having the same handler for both errors and exceptions is desired, you can use errorhandling.register_handler, which is similar to error_handler and exception_handler but without inherent specializations.
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