When you decorate a function with contextmanager that didn't yield you got an
AttributeError instead of a proper RuntimeError "generator didn't yield". For
example:
>>> @contextlib.contextmanager
>>> def foo():
... pass
...
>>> with foo():
... do_something()
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
return self.gen.next()
AttributeError: 'NoneType' object has no attribute 'next'
The proper exception should be a RuntimerError with the "generator didn't
yield" message. At least for Python version 2.7.6.
Regards
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