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Diffstat (limited to 'Doc/lib/libsys.tex')
| -rw-r--r-- | Doc/lib/libsys.tex | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Doc/lib/libsys.tex b/Doc/lib/libsys.tex index 3f8f7b6..d027aa6 100644 --- a/Doc/lib/libsys.tex +++ b/Doc/lib/libsys.tex @@ -99,6 +99,11 @@ It is always available. encapsulates the call stack at the point where the exception originally occurred. \obindex{traceback} + If \function{exc_clear()} is called, this function will return three + \code{None} values until either another exception is raised in the + current thread or the execution stack returns to a frame where + another exception is being handled. + \warning{Assigning the \var{traceback} return value to a local variable in a function that is handling an exception will cause a circular reference. This will prevent anything referenced @@ -115,6 +120,21 @@ It is always available. efficient to avoid creating cycles.} \end{funcdesc} +\begin{funcdesc}{exc_clear}{} + This function clears all information relating to the current or last + exception that occured in the current thread. After calling this + function, \function{exc_info()} will return three \code{None} values until + another exception is raised in the current thread or the execution stack + returns to a frame where another exception is being handled. + + This function is only needed in only a few obscure situations. These + include logging and error handling systems that report information on the + last or current exception. This function can also be used to try to free + resources and trigger object finalization, though no guarantee is made as + to what objects will be freed, if any. +\versionadded{2.3} +\end{funcdesc} + \begin{datadesc}{exc_type} \dataline{exc_value} \dataline{exc_traceback} |