Ran Benita <r...@unusedvar.com> added the comment:

Hmm I realize after the fact that since the equivalent code snippet (which is 
actually the implementation) is a generator, then it is actually correct that 
prepare() isn't called until it is iterated. So the documentation for this is 
not incorrect.

Still, I think it would be better if the prepare() executes immediately rather 
than in the first iteration.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42588>
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