Nick Coghlan added the comment:
Even Python 2 functions support setting arbitrary attributes, so
contextlib2.contextmanager can always just add an __annotations__ dict to
decorated functions if it doesn't already exist.
```
>>> def f():
... pass
...
>>> f.__annotations__
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'function' object has no attribute '__annotations__'
>>> f.__annotations__ = {}
>>> f.__annotations__
{}
```
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<http://bugs.python.org/issue30359>
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