[issue33401] `exec` attribute can't be set to objects in Python2 (SyntaxError)

[luav]

luav <luardev at gmail.com> added the comment:

I'm sorry for the previous question, now it's clear (the space is allowed after the '.' which complicates the parsing):
```
>>> o.e = 1
>>> o. e
1
>>> o.e
1

```

Anyway, it would be nice to outline the eligible values for attributes in the documentation (https://docs.python.org/2/tutorial/classes.html).

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<https://bugs.python.org/issue33401>
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