[issue19331] Revise PEP 8 recommendation for class names

[Antoine Pitrou]

Antoine Pitrou added the comment:

s/should be followed/may be followed/

As an other point of reference, for a long time the synchronization classes in the threading module were actually mediated by function wrappers, e.g.:

  def Lock(*args, **kwargs):
      return _Lock(*args, **kwargs)

(this was to "discourage subclassing", IIRC)

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nosy: +pitrou

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