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Describe what happens when ``raise C, x'' is called where C is a class

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and x is not an instance of C (nor of a class derived of C).
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Guido van Rossum 1998-08-25 14:45:41 +00:00
parent dbf7956e52
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Doc/ref/ref6.tex
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@ -366,19 +366,25 @@ expression that was raised in the current scope.
Otherwose, \keyword{raise} evaluates its first expression, which must yield Otherwose, \keyword{raise} evaluates its first expression, which must yield
a string, class, or instance object. If there is a second expression, a string, class, or instance object. If there is a second expression,
this is evaluated, else \code{None} is substituted. If the first this is evaluated, else \code{None} is substituted. If the first
expression is a class object, then the second expression must be an expression is a class object, then the second expression may be an
instance of that class or one of its derivatives. If the first instance of that class or one of its derivatives, and then that
instance is raised. If the second expression is not such an instance,
the given class is instantiated. The argument list for the
instantiation is determined as follows: if the second expression is a
tuple, it is used as the argument list; if it is \code{None}, the
argument list is empty; otherwise, the argument list consists of a
single argument which is the second expression. If the first
expression is an instance object, the second expression must be expression is an instance object, the second expression must be
\code{None}. \code{None}.
\index{exception} \index{exception}
\indexii{raising}{exception} \indexii{raising}{exception}
If the first object is a class or string, it then raises the exception If the first object is a string, it then raises the exception
identified by the first object, with the second one (or \code{None}) identified by the first object, with the second one (or \code{None})
as its parameter. If the first object is an instance, it raises the as its parameter. If the first object is a class or instance,
exception identified by the class of the object, with the instance as it raises the exception identified by the class of the instance
its parameter (and there should be no second object, or the second determined in the previous step, with the instance as
object should be \code{None}). its parameter.
If a third object is present, and it is not \code{None}, it should be If a third object is present, and it is not \code{None}, it should be
a traceback object (see section \ref{traceback}), and it is a traceback object (see section \ref{traceback}), and it is