diff options
Diffstat (limited to 'Doc/library/sys.rst')
| -rw-r--r-- | Doc/library/sys.rst | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst index bf3fd47..3af5b5f 100644 --- a/Doc/library/sys.rst +++ b/Doc/library/sys.rst @@ -746,8 +746,9 @@ always available. ``'return'`` A function (or other code block) is about to return. The local trace - function is called; *arg* is the value that will be returned. The trace - function's return value is ignored. + function is called; *arg* is the value that will be returned, or ``None`` + if the event is caused by an exception being raised. The trace function's + return value is ignored. ``'exception'`` An exception has occurred. The local trace function is called; *arg* is a @@ -759,10 +760,10 @@ always available. a built-in. *arg* is the C function object. ``'c_return'`` - A C function has returned. *arg* is ``None``. + A C function has returned. *arg* is the C function object. ``'c_exception'`` - A C function has raised an exception. *arg* is ``None``. + A C function has raised an exception. *arg* is the C function object. Note that as an exception is propagated down the chain of callers, an ``'exception'`` event is generated at each level. |