In python 3.8:

```
>>> class A(object):
...     """standard docstring"""
...     pass
...
>>> import inspect
>>> inspect.getdoc(A())
'standard docstring'
```

In 3.9:

```
$ python
Python 3.9.0a6+ (heads/master:5b956ca42d, May 10 2020, 20:31:26)
[Clang 9.0.0 (clang-900.0.39.2)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> class A(object):
KeyboardInterrupt
>>> class A(object):
...     """standard docstring"""
...     pass
...
>>> import inspect
>>> inspect.getdoc(A())
>>>
```

That will break a lot o the interactive usage for the scientific ecossytem Imho, 

For example anyone that get a Pandas Dataframe and try to get help on it either via help(df), or `df?` in IPython/Jupyter.

Might be purposeful (https://bugs.python.org/issue40257)

This change was part of #40257 and is being discussed there (where I suggested reverting it).