code: def wnexpd(left, right, window):
      
      assert isinstance(window, stypes.SpiceCell)
      assert window.dtype == 1
      left = ctypes.c_double(left)
      right = ctypes.c_double(right)
      libspice.wnexpd_c(left, right, ctypes.byref(window))
      return window
docs: Expand each of the intervals of a double precision window.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/wnexpd_c.html
  
      :param left: Amount subtracted from each left endpoint. 
      :type left: float
      :param right: Amount added to each right endpoint. 
      :type right: float
      :param window: Window to be expanded. 
      :type window: spiceypy.utils.support_types.SpiceCell
      :return: Expanded Window.
      :rtype: spiceypy.utils.support_types.SpiceCell