<:raise [exc]:>
Raises the exception exc, or if exc isn't specified, the current exception if one was previously caught. If you specify exc without backticks, the tag will raise the exception as the string you indicated:
<:raise BadBadError:>
will raise the string "BadBadError" as the exception. If you want to raise a real exception, such as one of Python's built-in exceptions or an exception class from a module, you must put it in backticks. For example, if you want to reject the value of some variable passed to you with the Python built-in exception ValueError:
<:raise `ValueError`:>
Please note that if you do not specify exc, and an exception has not previously occurred, SkunkWeb will raise a TypeError exception with the message ``exceptions must be strings, classes, or instances''.
This tag behaves identically to the raise statement in Python.