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  1.  
  2. def works(it):
  3. while True:
  4. yield [next(it) for _ in xrange(2)]
  6. def notworks(it):
  7. while True:
  8. yield list(next(it) for _ in xrange(2))
  10. print list(works(iter([1,2,3,4,5])))
  12. # will never return
  13. print list(notworks(iter([1,2,3,4])))
  14.  
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