[issue24879] Pydoc to list data descriptors in _fields order if it exists

[Yury Selivanov]

Yury Selivanov added the comment:

Can this be enabled only for namedtuples?  Otherwise this might be a backwards incompatible change, for example:

  class Foo:
    '''spam'''
    _fields = None

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nosy: +yselivanov

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<http://bugs.python.org/issue24879>
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