Bugs item #1462485, was opened at 2006-04-01 00:17
Message generated for change (Comment added) made by tcdelaney
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Category: Python Interpreter Core
Group: Python 2.5
Status: Open
Resolution: None
Priority: 7
Submitted By: Tim Delaney (tcdelaney)
Assigned to: Nick Coghlan (ncoghlan)
Summary: StopIteration raised in body of 'with' statement suppressed
Initial Comment:
Given:
@contextmanager
def gen():
print '__enter__'
try:
yield
finally:
print '__exit__'
with gen():
raise StopIteration('body')
running the above results in:
__enter__
__exit__
I would have expected instead
__enter__
__exit__
Traceback (most recent call last):
File "test25.py", line 53, in <module>
raise StopIteration('body')
StopIteration: body
Note that doing:
with gen():
raise GeneratorExit('body')
does the expected thing:
__enter__
__exit__
Traceback (most recent call last):
File "test25.py", line 53, in <module>
raise GeneratorExit('body')
GeneratorExit: body
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>Comment By: Tim Delaney (tcdelaney)
Date: 2006-04-02 02:42
Message:
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Attached diffs to test_with.py which adds tests for raising StopIteration (and
GeneratorExit) from the body of a with-statement where the context manager is
either a generator, or a class instance.
I think the correct behaviour is to return False from
GeneratorContextManager.__exit__ if the thrown exception is a StopIteration,
and the exact same instance is raised from self.gen.throw(). Diffs for this
also attached.
----------------------------------------------------------------------
Comment By: Georg Brandl (gbrandl)
Date: 2006-04-01 07:02
Message:
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Nick, I can't tell whether this is intentional without
rereading the specs. Can you?
----------------------------------------------------------------------
Comment By: Tim Delaney (tcdelaney)
Date: 2006-04-01 00:19
Message:
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user_id=603121
Attached code and results.
----------------------------------------------------------------------
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