[issue18472] Update PEP 8 to encourage modern conventions

[Nick Coghlan]

Nick Coghlan added the comment:

Heh, I just realised a correct generator definition would have needed the loop-and-a-half internally anyway:

    def itervalues(x):
        while True:
          value = x.getvalue()
          if not value:
              break
          yield value

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<http://bugs.python.org/issue18472>
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