diff options
Diffstat (limited to 'Doc/ref')
| -rw-r--r-- | Doc/ref/ref3.tex | 5 | ||||
| -rw-r--r-- | Doc/ref/ref7.tex | 15 |
2 files changed, 17 insertions, 3 deletions
diff --git a/Doc/ref/ref3.tex b/Doc/ref/ref3.tex index df62486..855dc82 100644 --- a/Doc/ref/ref3.tex +++ b/Doc/ref/ref3.tex @@ -532,12 +532,13 @@ the code object). \ttindex{f_lineno} \ttindex{f_lasti} -\item[Traceback objects] +\item[Traceback objects] \label{traceback} Traceback objects represent a stack trace of an exception. A traceback object is created when an exception occurs. When the search for an exception handler unwinds the execution stack, at each unwound level a traceback object is inserted in front of the current -traceback. When an exception handler is entered, the stack trace is +traceback. When an exception handler is entered +(see also section \ref{try}), the stack trace is made available to the program as \verb\sys.exc_traceback\. When the program contains no suitable handler, the stack trace is written (nicely formatted) to the standard error stream; if the interpreter is diff --git a/Doc/ref/ref7.tex b/Doc/ref/ref7.tex index 357bd5f..0f96c82 100644 --- a/Doc/ref/ref7.tex +++ b/Doc/ref/ref7.tex @@ -172,7 +172,7 @@ for x in a[:]: if x < 0: a.remove(x) \end{verbatim} -\section{The {\tt try} statement} +\section{The {\tt try} statement} \label{try} \stindex{try} The \verb\try\ statement specifies exception handlers and/or cleanup @@ -222,6 +222,19 @@ statement. (This means that if two nested handlers exist for the same exception, and the exception occurs in the try clause of the inner handler, the outer handler will not handle the exception.) +Before an except clause's suite is executed, details about the +exception are assigned to three variables in the \verb\sys\ module: +\verb\sys.exc_type\ receives the object identifying the exception; +\verb\sys.exc_value\ receives the exception's parameter; +\verb\sys.exc_traceback\ receives a traceback object (see section +\ref{traceback}) identifying the point in the program where the +exception occurred. +\bimodindex{sys} +\ttindex{exc_type} +\ttindex{exc_value} +\ttindex{exc_traceback} +\obindex{traceback} + The \verb\try...finally\ form specifies a `cleanup' handler. The \verb\try\ clause is executed. When no exception occurs, the \verb\finally\ clause is executed. When an exception occurs in the |