Can somebody confirm the following behavior is expected: When a 'with' statement invokes __exit__(), it looks like sys.exc_info() is not actually set.
I know this may be a very pedantic detail, but I'm working on IronPython and would like to make it consistent with CPython's behavior.
The PEP (http://www.python.org/dev/peps/pep-0343/ ) says that 'With' can be substituted as follows:
mgr = (EXPR)
exit = mgr.__exit__ # Not calling it yet
value = mgr.__enter__()
exc = True
try:
try:
VAR = value # Only if "as VAR" is present
BLOCK
except:
# The exceptional case is handled here
exc = False
if not exit(*sys.exc_info()):
raise
# The exception is swallowed if exit() returns true
finally:
# The normal and non-local-goto cases are handled here
if exc:
exit(None, None, None)
and that "The details of the above translation are intended to prescribe the exact semantics.". This implies that sys.exc_info() would be set when exit is invoked.
I'm finding in practice that sys.exc_info() is not set when __exit__() is invoked in the exceptional case. I attached a simple repro (repro.py) to demonstrate exactly what I mean.
Can somebody confirm this is the expected behavior?
Thanks,
Mike
http://blogs.msdn.com/jmstall
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