code: def lon360to180(lon):
      
      if np.any(lon > 360.0) or np.any(lon < 0.0):
          print("Warning: lon outside expected range")
          lon = wraplon(lon)
      #lon[lon > 180.0] -= 360.0
      #lon180 = (lon+180) - np.floor((lon+180)/360)*360 - 180
      lon = lon - (lon.astype(int)/180)*360.0
      return lon
docs: Convert longitude from (0, 360) to (-180, 180)