code: def iterator_from_slice(s):
      
      import numpy as np
      start = s.start if s.start is not None else 0
      step = s.step if s.step is not None else 1
  
      if s.stop is None:
          # Infinite iterator.
          return itertools.count(start=start, step=step)
      else:
          # xrange-like iterator that supports float.
          return iter(np.arange(start, s.stop, step))
docs: Constructs an iterator given a slice object s.
  
      .. note::
  
          The function returns an infinite iterator if s.stop is None