Re: Inconsistency in retrieving exceptions via sys module

[Gabriel Genellina]

En Mon, 12 May 2008 13:47:45 -0300, Raj Bandyopadhyay <ra**@rice.edu>
escribió:

I am writing some C code which sets and retrieves a Python exception. I
set the exception using PyErr_SetString(), and retrieve it in 2 ways: 1)
using PyErr_Occurred() and 2) Using sys.exc_type. However, I get two
different results and am very puzzled by this apparent inconsistency.
Could anyone please clarify what I'm missing? I need both to work
consistently for my application.

The sys.exc_* variables are just for backwards compatibility, don't use
them; use sys.exc_info() in Python code and PyErr_Occurred (and the other
PyErr... functions) in C. (Note that even PyErr_Occurred is not so common
in C code, as most functions have some way to say "there was an error"; by
example, functions that return a PyObject* mark an error returning NULL).

The sys.exc_* variables are set only at the end of each Python bytecode
instruction (see ceval.c)

--
Gabriel Genellina