Serhiy Storchaka added the comment:

> While not required, It'd be useful if the implementation of this pre-scanned 
> the data internally so that the length of the generated sequence was known up 
> front.  This could imply an internal bitset of vector of split indices is 
> kept for the life of the generator (implementation detail left up to the 
> implementor) if scanning over the input data more than once is undesirable.

bytearray can be modified between iterations.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue17343>
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