code: def _check_steps(a, b):
      
      if a.step != 1:
          raise ValueError('a.step must be equal to 1, got: %s' % a.step)
      if b.step != 1:
          raise ValueError('b.step must be equal to 1, got: %s' % b.step)
docs: Check that the steps of ``a`` and ``b`` are both 1.
  
      Parameters
      ----------
      a : range
          The first range to check.
      b : range
          The second range to check.
  
      Raises
      ------
      ValueError
          Raised when either step is not 1.