Github user yu-iskw commented on the pull request:
https://github.com/apache/spark/pull/8665#issuecomment-138815465
@mengxr unfortunately, a class which inherits from `object` doesn't work.
And as I commented on
[SPARK-10276](https://issues.apache.org/jira/browse/SPARK-10276), it doesn't
work with `@classmethod`.
```
# Work
@since("1.6.0")
class Foo():
# Not Work
@since("1.6.0")
class Foo(object):
```
When I tried to add `@since` to a class which inherits from `object`, I got
an error. It seems that we can't rewrite `__doc__`.
```
Traceback (most recent call last):
File "tmp.py", line 24, in <module>
class Foo(object):
File "tmp.py", line 13, in deco
f.__doc__ = ".. versionadded:: %s" % (version)
AttributeError: attribute '__doc__' of 'type' objects is not writable
```
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