[docs] [issue15355] generator docs should mention already-executing exception

[Chris Jerdonek]

Chris Jerdonek added the comment:

Nick, would you be able to take a look at this minor documentation patch re: generators?  Would you prefer this blanket statement, or an explicit (possibly repeated) statement inside the documentation of each method?

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versions: +Python 2.7, Python 3.2

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<http://bugs.python.org/issue15355>
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