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Give a slightly better explanation of excepthook.

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Ka-Ping Yee 2001-03-23 05:17:41 +00:00
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Doc/lib/libsys.tex
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@ -51,19 +51,21 @@ If \var{value} is not \code{None}, this function prints it to
\code{sys.displayhook} is called on the result of evaluating \code{sys.displayhook} is called on the result of evaluating
an expression entered in an interactive Python session. an expression entered in an interactive Python session.
The display of these values can be customized by assigning The display of these values can be customized by assigning
another function to \code{sys.displayhook}. another one-argument function to \code{sys.displayhook}.
\end{funcdesc} \end{funcdesc}
\begin{funcdesc}{excepthook}{\var{type}, \var{value}, \var{traceback}} \begin{funcdesc}{excepthook}{\var{type}, \var{value}, \var{traceback}}
This function prints out a given traceback and exception to This function prints out a given traceback and exception to
\code{sys.stderr}. \code{sys.stderr}.
\code{sys.excepthook} is called when an exception is raised When an exception is raised and uncaught, the interpreter calls
and uncaught. In an interactive session this happens just before \code{sys.excepthook} with three arguments, the exception class,
exception instance, and a traceback object.
In an interactive session this happens just before
control is returned to the prompt; in a Python program this happens control is returned to the prompt; in a Python program this happens
just before the program exits. just before the program exits.
The handling of such top-level exceptions can be customized by The handling of such top-level exceptions can be customized by
assigning another function to \code{sys.excepthook}. assigning another three-argument function to \code{sys.excepthook}.
\end{funcdesc} \end{funcdesc}
\begin{datadesc}{__displayhook__} \begin{datadesc}{__displayhook__}